Frameworks/base: Replace LOG_FATAL_IF in core/jni

Do not use LOG_FATAL_IF in JNI setup. This is one-time on startup
and important enough to always check.

Add a header with common helper definitions. Move to inlined functions
instead of macros to clean up the code.

Change-Id: Ib12d0eed61b110c45d748e80ec36c563e9dec7e5

35 files changed, 501 insertions, 817 deletions

diff --git a/core/jni/android_app_NativeActivity.cpp b/core/jni/android_app_NativeActivity.cpp
index 633a207..a65b690 100644
--- a/core/jni/android_app_NativeActivity.cpp
+++ b/core/jni/android_app_NativeActivity.cpp
@@ -40,6 +40,8 @@
 
 #include "nativebridge/native_bridge.h"
 
+#include "core_jni_helpers.h"
+
 #define LOG_TRACE(...)
 //#define LOG_TRACE(...) ALOG(LOG_DEBUG, LOG_TAG, __VA_ARGS__)
 
@@ -632,39 +634,20 @@ static const JNINativeMethod g_methods[] = {
 
 static const char* const kNativeActivityPathName = "android/app/NativeActivity";
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class %s", className);
-
-#define GET_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method" methodName);
-        
 int register_android_app_NativeActivity(JNIEnv* env)
 {
     //ALOGD("register_android_app_NativeActivity");
-    jclass clazz;
-    FIND_CLASS(clazz, kNativeActivityPathName);
-
-    GET_METHOD_ID(gNativeActivityClassInfo.finish,
-            clazz,
-            "finish", "()V");
-    GET_METHOD_ID(gNativeActivityClassInfo.setWindowFlags,
-            clazz,
-            "setWindowFlags", "(II)V");
-    GET_METHOD_ID(gNativeActivityClassInfo.setWindowFormat,
-            clazz,
-            "setWindowFormat", "(I)V");
-    GET_METHOD_ID(gNativeActivityClassInfo.showIme,
-            clazz,
-            "showIme", "(I)V");
-    GET_METHOD_ID(gNativeActivityClassInfo.hideIme,
-            clazz,
-            "hideIme", "(I)V");
-
-    return AndroidRuntime::registerNativeMethods(
-        env, kNativeActivityPathName,
-        g_methods, NELEM(g_methods));
+    jclass clazz = FindClassOrDie(env, kNativeActivityPathName);
+
+    gNativeActivityClassInfo.finish = GetMethodIDOrDie(env, clazz, "finish", "()V");
+    gNativeActivityClassInfo.setWindowFlags = GetMethodIDOrDie(env, clazz, "setWindowFlags",
+                                                               "(II)V");
+    gNativeActivityClassInfo.setWindowFormat = GetMethodIDOrDie(env, clazz, "setWindowFormat",
+                                                                "(I)V");
+    gNativeActivityClassInfo.showIme = GetMethodIDOrDie(env, clazz, "showIme", "(I)V");
+    gNativeActivityClassInfo.hideIme = GetMethodIDOrDie(env, clazz, "hideIme", "(I)V");
+
+    return RegisterMethodsOrDie(env, kNativeActivityPathName, g_methods, NELEM(g_methods));
 }
 
 } // namespace android
diff --git a/core/jni/android_app_backup_FullBackup.cpp b/core/jni/android_app_backup_FullBackup.cpp
index 5e334c9..2c02b37 100644
--- a/core/jni/android_app_backup_FullBackup.cpp
+++ b/core/jni/android_app_backup_FullBackup.cpp
@@ -23,6 +23,8 @@
 
 #include <androidfw/BackupHelpers.h>
 
+#include "core_jni_helpers.h"
+
 #include <string.h>
 
 namespace android
@@ -116,15 +118,11 @@ static const JNINativeMethod g_methods[] = {
 
 int register_android_app_backup_FullBackup(JNIEnv* env)
 {
-    jclass clazz = env->FindClass("android/app/backup/BackupDataOutput");
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.app.backup.BackupDataOutput");
+    jclass clazz = FindClassOrDie(env, "android/app/backup/BackupDataOutput");
 
-    sBackupDataOutput.mBackupWriter = env->GetFieldID(clazz, "mBackupWriter", "J");
-    LOG_FATAL_IF(sBackupDataOutput.mBackupwriter == NULL,
-            "Unable to find mBackupWriter field in android.app.backup.BackupDataOutput");
+    sBackupDataOutput.mBackupWriter = GetFieldIDOrDie(env, clazz, "mBackupWriter", "J");
 
-    return AndroidRuntime::registerNativeMethods(env, "android/app/backup/FullBackup",
-            g_methods, NELEM(g_methods));
+    return RegisterMethodsOrDie(env, "android/app/backup/FullBackup", g_methods, NELEM(g_methods));
 }
 
 }
diff --git a/core/jni/android_backup_BackupDataInput.cpp b/core/jni/android_backup_BackupDataInput.cpp
index 90763b0..096a784 100644
--- a/core/jni/android_backup_BackupDataInput.cpp
+++ b/core/jni/android_backup_BackupDataInput.cpp
@@ -22,6 +22,8 @@
 
 #include <androidfw/BackupHelpers.h>
 
+#include "core_jni_helpers.h"
+
 namespace android
 {
 
@@ -135,17 +137,12 @@ int register_android_backup_BackupDataInput(JNIEnv* env)
 {
     //ALOGD("register_android_backup_BackupDataInput");
 
-    jclass clazz = env->FindClass("android/app/backup/BackupDataInput$EntityHeader");
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.app.backup.BackupDataInput.EntityHeader");
-    s_keyField = env->GetFieldID(clazz, "key", "Ljava/lang/String;");
-    LOG_FATAL_IF(s_keyField == NULL,
-            "Unable to find key field in android.app.backup.BackupDataInput.EntityHeader");
-    s_dataSizeField = env->GetFieldID(clazz, "dataSize", "I");
-    LOG_FATAL_IF(s_dataSizeField == NULL,
-            "Unable to find dataSize field in android.app.backup.BackupDataInput.EntityHeader");
-
-    return AndroidRuntime::registerNativeMethods(env, "android/app/backup/BackupDataInput",
-            g_methods, NELEM(g_methods));
+    jclass clazz = FindClassOrDie(env, "android/app/backup/BackupDataInput$EntityHeader");
+    s_keyField = GetFieldIDOrDie(env, clazz, "key", "Ljava/lang/String;");
+    s_dataSizeField = GetFieldIDOrDie(env, clazz, "dataSize", "I");
+
+    return RegisterMethodsOrDie(env, "android/app/backup/BackupDataInput", g_methods,
+                                NELEM(g_methods));
 }
 
 }
diff --git a/core/jni/android_backup_BackupHelperDispatcher.cpp b/core/jni/android_backup_BackupHelperDispatcher.cpp
index a8b7d44..80bdaf8 100644
--- a/core/jni/android_backup_BackupHelperDispatcher.cpp
+++ b/core/jni/android_backup_BackupHelperDispatcher.cpp
@@ -24,6 +24,7 @@
 #include <sys/uio.h>
 #include <unistd.h>
 
+#include "core_jni_helpers.h"
 
 #define VERSION_1_HEADER 0x01706c48  // 'Hlp'1 little endian
 
@@ -227,18 +228,12 @@ static const JNINativeMethod g_methods[] = {
 
 int register_android_backup_BackupHelperDispatcher(JNIEnv* env)
 {
-    jclass clazz = env->FindClass("android/app/backup/BackupHelperDispatcher$Header");
-    LOG_FATAL_IF(clazz == NULL,
-            "Unable to find class android.app.backup.BackupHelperDispatcher.Header");
-    s_chunkSizeField = env->GetFieldID(clazz, "chunkSize", "I");
-    LOG_FATAL_IF(s_chunkSizeField == NULL,
-            "Unable to find chunkSize field in android.app.backup.BackupHelperDispatcher.Header");
-    s_keyPrefixField = env->GetFieldID(clazz, "keyPrefix", "Ljava/lang/String;");
-    LOG_FATAL_IF(s_keyPrefixField == NULL,
-            "Unable to find keyPrefix field in android.app.backup.BackupHelperDispatcher.Header");
-
-    return AndroidRuntime::registerNativeMethods(env, "android/app/backup/BackupHelperDispatcher",
-            g_methods, NELEM(g_methods));
+    jclass clazz = FindClassOrDie(env, "android/app/backup/BackupHelperDispatcher$Header");
+    s_chunkSizeField = GetFieldIDOrDie(env, clazz, "chunkSize", "I");
+    s_keyPrefixField = GetFieldIDOrDie(env, clazz, "keyPrefix", "Ljava/lang/String;");
+
+    return RegisterMethodsOrDie(env, "android/app/backup/BackupHelperDispatcher", g_methods,
+                                NELEM(g_methods));
 }
 
 }
diff --git a/core/jni/android_content_res_Configuration.cpp b/core/jni/android_content_res_Configuration.cpp
index 201ffe8..3b45e72 100644
--- a/core/jni/android_content_res_Configuration.cpp
+++ b/core/jni/android_content_res_Configuration.cpp
@@ -23,6 +23,8 @@
 #include <android_runtime/android_content_res_Configuration.h>
 #include "android_runtime/AndroidRuntime.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -70,49 +72,27 @@ void android_Configuration_getFromJava(
             gConfigurationClassInfo.smallestScreenWidthDp);
 }
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_content_res_Configuration(JNIEnv* env)
 {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/content/res/Configuration");
+    jclass clazz = FindClassOrDie(env, "android/content/res/Configuration");
 
-    GET_FIELD_ID(gConfigurationClassInfo.mcc, clazz,
-            "mcc", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.mnc, clazz,
-            "mnc", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.locale, clazz,
-            "locale", "Ljava/util/Locale;");
-    GET_FIELD_ID(gConfigurationClassInfo.screenLayout, clazz,
-            "screenLayout", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.touchscreen, clazz,
-            "touchscreen", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.keyboard, clazz,
-            "keyboard", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.keyboardHidden, clazz,
-            "keyboardHidden", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.hardKeyboardHidden, clazz,
-            "hardKeyboardHidden", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.navigation, clazz,
-            "navigation", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.navigationHidden, clazz,
-            "navigationHidden", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.orientation, clazz,
-            "orientation", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.uiMode, clazz,
-            "uiMode", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.screenWidthDp, clazz,
-            "screenWidthDp", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.screenHeightDp, clazz,
-            "screenHeightDp", "I");
-    GET_FIELD_ID(gConfigurationClassInfo.smallestScreenWidthDp, clazz,
-            "smallestScreenWidthDp", "I");
+    gConfigurationClassInfo.mcc = GetFieldIDOrDie(env, clazz, "mcc", "I");
+    gConfigurationClassInfo.mnc = GetFieldIDOrDie(env, clazz, "mnc", "I");
+    gConfigurationClassInfo.locale = GetFieldIDOrDie(env, clazz, "locale", "Ljava/util/Locale;");
+    gConfigurationClassInfo.screenLayout = GetFieldIDOrDie(env, clazz, "screenLayout", "I");
+    gConfigurationClassInfo.touchscreen = GetFieldIDOrDie(env, clazz, "touchscreen", "I");
+    gConfigurationClassInfo.keyboard = GetFieldIDOrDie(env, clazz, "keyboard", "I");
+    gConfigurationClassInfo.keyboardHidden = GetFieldIDOrDie(env, clazz, "keyboardHidden", "I");
+    gConfigurationClassInfo.hardKeyboardHidden = GetFieldIDOrDie(env, clazz, "hardKeyboardHidden",
+                                                                 "I");
+    gConfigurationClassInfo.navigation = GetFieldIDOrDie(env, clazz, "navigation", "I");
+    gConfigurationClassInfo.navigationHidden = GetFieldIDOrDie(env, clazz, "navigationHidden", "I");
+    gConfigurationClassInfo.orientation = GetFieldIDOrDie(env, clazz, "orientation", "I");
+    gConfigurationClassInfo.uiMode = GetFieldIDOrDie(env, clazz, "uiMode", "I");
+    gConfigurationClassInfo.screenWidthDp = GetFieldIDOrDie(env, clazz, "screenWidthDp", "I");
+    gConfigurationClassInfo.screenHeightDp = GetFieldIDOrDie(env, clazz, "screenHeightDp", "I");
+    gConfigurationClassInfo.smallestScreenWidthDp = GetFieldIDOrDie(env, clazz,
+                                                                    "smallestScreenWidthDp", "I");
 
     return 0;
 }
diff --git a/core/jni/android_content_res_ObbScanner.cpp b/core/jni/android_content_res_ObbScanner.cpp
index 5d51ee2..ef17db6 100644
--- a/core/jni/android_content_res_ObbScanner.cpp
+++ b/core/jni/android_content_res_ObbScanner.cpp
@@ -25,6 +25,8 @@
 #include "utils/misc.h"
 #include "android_runtime/AndroidRuntime.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -80,30 +82,17 @@ static JNINativeMethod gMethods[] = {
             (void*) android_content_res_ObbScanner_getObbInfo },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_content_res_ObbScanner(JNIEnv* env)
 {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/content/res/ObbInfo");
-
-    GET_FIELD_ID(gObbInfoClassInfo.packageName, clazz,
-            "packageName", "Ljava/lang/String;");
-    GET_FIELD_ID(gObbInfoClassInfo.version, clazz,
-            "version", "I");
-    GET_FIELD_ID(gObbInfoClassInfo.flags, clazz,
-            "flags", "I");
-    GET_FIELD_ID(gObbInfoClassInfo.salt, clazz,
-            "salt", "[B");
-
-    return AndroidRuntime::registerNativeMethods(env, "android/content/res/ObbScanner", gMethods,
-            NELEM(gMethods));
+    jclass clazz = FindClassOrDie(env, "android/content/res/ObbInfo");
+
+    gObbInfoClassInfo.packageName = GetFieldIDOrDie(env, clazz, "packageName",
+                                                    "Ljava/lang/String;");
+    gObbInfoClassInfo.version = GetFieldIDOrDie(env, clazz, "version", "I");
+    gObbInfoClassInfo.flags = GetFieldIDOrDie(env, clazz, "flags", "I");
+    gObbInfoClassInfo.salt = GetFieldIDOrDie(env, clazz, "salt", "[B");
+
+    return RegisterMethodsOrDie(env, "android/content/res/ObbScanner", gMethods, NELEM(gMethods));
 }
 
 }; // namespace android
diff --git a/core/jni/android_database_CursorWindow.cpp b/core/jni/android_database_CursorWindow.cpp
index af6cc72..580ac02 100644
--- a/core/jni/android_database_CursorWindow.cpp
+++ b/core/jni/android_database_CursorWindow.cpp
@@ -36,6 +36,8 @@
 #include "android_util_Binder.h"
 #include "android_database_SQLiteCommon.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -522,29 +524,16 @@ static JNINativeMethod sMethods[] =
             (void*)nativePutNull },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
-int register_android_database_CursorWindow(JNIEnv * env)
+int register_android_database_CursorWindow(JNIEnv* env)
 {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/database/CharArrayBuffer");
+    jclass clazz = FindClassOrDie(env, "android/database/CharArrayBuffer");
 
-    GET_FIELD_ID(gCharArrayBufferClassInfo.data, clazz,
-            "data", "[C");
-    GET_FIELD_ID(gCharArrayBufferClassInfo.sizeCopied, clazz,
-            "sizeCopied", "I");
+    gCharArrayBufferClassInfo.data = GetFieldIDOrDie(env, clazz, "data", "[C");
+    gCharArrayBufferClassInfo.sizeCopied = GetFieldIDOrDie(env, clazz, "sizeCopied", "I");
 
-    gEmptyString = jstring(env->NewGlobalRef(env->NewStringUTF("")));
-    LOG_FATAL_IF(!gEmptyString, "Unable to create empty string");
+    gEmptyString = MakeGlobalRefOrDie(env, env->NewStringUTF(""));
 
-    return AndroidRuntime::registerNativeMethods(env, "android/database/CursorWindow",
-            sMethods, NELEM(sMethods));
+    return RegisterMethodsOrDie(env, "android/database/CursorWindow", sMethods, NELEM(sMethods));
 }
 
 } // namespace android
diff --git a/core/jni/android_database_SQLiteConnection.cpp b/core/jni/android_database_SQLiteConnection.cpp
index 4378d1c..7a3cdf6 100644
--- a/core/jni/android_database_SQLiteConnection.cpp
+++ b/core/jni/android_database_SQLiteConnection.cpp
@@ -37,6 +37,8 @@
 
 #include "android_database_SQLiteCommon.h"
 
+#include "core_jni_helpers.h"
+
 // Set to 1 to use UTF16 storage for localized indexes.
 #define UTF16_STORAGE 0
 
@@ -841,35 +843,20 @@ static JNINativeMethod sMethods[] =
             (void*)nativeResetCancel },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method" methodName);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_database_SQLiteConnection(JNIEnv *env)
 {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/database/sqlite/SQLiteCustomFunction");
+    jclass clazz = FindClassOrDie(env, "android/database/sqlite/SQLiteCustomFunction");
 
-    GET_FIELD_ID(gSQLiteCustomFunctionClassInfo.name, clazz,
-            "name", "Ljava/lang/String;");
-    GET_FIELD_ID(gSQLiteCustomFunctionClassInfo.numArgs, clazz,
-            "numArgs", "I");
-    GET_METHOD_ID(gSQLiteCustomFunctionClassInfo.dispatchCallback,
-            clazz, "dispatchCallback", "([Ljava/lang/String;)V");
+    gSQLiteCustomFunctionClassInfo.name = GetFieldIDOrDie(env, clazz, "name", "Ljava/lang/String;");
+    gSQLiteCustomFunctionClassInfo.numArgs = GetFieldIDOrDie(env, clazz, "numArgs", "I");
+    gSQLiteCustomFunctionClassInfo.dispatchCallback = GetMethodIDOrDie(env, clazz,
+            "dispatchCallback", "([Ljava/lang/String;)V");
 
-    FIND_CLASS(clazz, "java/lang/String");
-    gStringClassInfo.clazz = jclass(env->NewGlobalRef(clazz));
+    clazz = FindClassOrDie(env, "java/lang/String");
+    gStringClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
 
-    return AndroidRuntime::registerNativeMethods(env, "android/database/sqlite/SQLiteConnection",
-            sMethods, NELEM(sMethods));
+    return RegisterMethodsOrDie(env, "android/database/sqlite/SQLiteConnection", sMethods,
+                                NELEM(sMethods));
 }
 
 } // namespace android
diff --git a/core/jni/android_database_SQLiteDebug.cpp b/core/jni/android_database_SQLiteDebug.cpp
index c1e7305..26e13cf 100644
--- a/core/jni/android_database_SQLiteDebug.cpp
+++ b/core/jni/android_database_SQLiteDebug.cpp
@@ -28,6 +28,8 @@
 
 #include <sqlite3.h>
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -62,27 +64,17 @@ static JNINativeMethod gMethods[] =
             (void*) nativeGetPagerStats },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_database_SQLiteDebug(JNIEnv *env)
 {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/database/sqlite/SQLiteDebug$PagerStats");
+    jclass clazz = FindClassOrDie(env, "android/database/sqlite/SQLiteDebug$PagerStats");
 
-    GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.memoryUsed, clazz,
-            "memoryUsed", "I");
-    GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.largestMemAlloc, clazz,
+    gSQLiteDebugPagerStatsClassInfo.memoryUsed = GetFieldIDOrDie(env, clazz, "memoryUsed", "I");
+    gSQLiteDebugPagerStatsClassInfo.largestMemAlloc = GetFieldIDOrDie(env, clazz,
             "largestMemAlloc", "I");
-    GET_FIELD_ID(gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow, clazz,
+    gSQLiteDebugPagerStatsClassInfo.pageCacheOverflow = GetFieldIDOrDie(env, clazz,
             "pageCacheOverflow", "I");
 
-    return AndroidRuntime::registerNativeMethods(env, "android/database/sqlite/SQLiteDebug",
+    return RegisterMethodsOrDie(env, "android/database/sqlite/SQLiteDebug",
             gMethods, NELEM(gMethods));
 }
 
diff --git a/core/jni/android_hardware_SensorManager.cpp b/core/jni/android_hardware_SensorManager.cpp
index ec2bd84..d1b1a1a 100644
--- a/core/jni/android_hardware_SensorManager.cpp
+++ b/core/jni/android_hardware_SensorManager.cpp
@@ -28,6 +28,8 @@
 #include "android_os_MessageQueue.h"
 #include <android_runtime/AndroidRuntime.h>
 
+#include "core_jni_helpers.h"
+
 static struct {
     jclass clazz;
     jmethodID dispatchSensorEvent;
@@ -294,32 +296,22 @@ static JNINativeMethod gBaseEventQueueMethods[] = {
 
 using namespace android;
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
 int register_android_hardware_SensorManager(JNIEnv *env)
 {
-    jniRegisterNativeMethods(env, "android/hardware/SystemSensorManager",
+    RegisterMethodsOrDie(env, "android/hardware/SystemSensorManager",
             gSystemSensorManagerMethods, NELEM(gSystemSensorManagerMethods));
 
-    jniRegisterNativeMethods(env, "android/hardware/SystemSensorManager$BaseEventQueue",
+    RegisterMethodsOrDie(env, "android/hardware/SystemSensorManager$BaseEventQueue",
             gBaseEventQueueMethods, NELEM(gBaseEventQueueMethods));
 
-    FIND_CLASS(gBaseEventQueueClassInfo.clazz, "android/hardware/SystemSensorManager$BaseEventQueue");
+    gBaseEventQueueClassInfo.clazz = FindClassOrDie(env,
+            "android/hardware/SystemSensorManager$BaseEventQueue");
 
-    GET_METHOD_ID(gBaseEventQueueClassInfo.dispatchSensorEvent,
-            gBaseEventQueueClassInfo.clazz,
-            "dispatchSensorEvent", "(I[FIJ)V");
+    gBaseEventQueueClassInfo.dispatchSensorEvent = GetMethodIDOrDie(env,
+            gBaseEventQueueClassInfo.clazz, "dispatchSensorEvent", "(I[FIJ)V");
 
-    GET_METHOD_ID(gBaseEventQueueClassInfo.dispatchFlushCompleteEvent,
-                  gBaseEventQueueClassInfo.clazz,
-                  "dispatchFlushCompleteEvent", "(I)V");
+    gBaseEventQueueClassInfo.dispatchFlushCompleteEvent = GetMethodIDOrDie(env,
+            gBaseEventQueueClassInfo.clazz, "dispatchFlushCompleteEvent", "(I)V");
 
     return 0;
 }
diff --git a/core/jni/android_net_NetUtils.cpp b/core/jni/android_net_NetUtils.cpp
index 8b9f574..991b43f 100644
--- a/core/jni/android_net_NetUtils.cpp
+++ b/core/jni/android_net_NetUtils.cpp
@@ -26,6 +26,8 @@
 #include <arpa/inet.h>
 #include <cutils/properties.h>
 
+#include "core_jni_helpers.h"
+
 extern "C" {
 int ifc_enable(const char *ifname);
 int ifc_disable(const char *ifname);
@@ -269,27 +271,26 @@ static JNINativeMethod gNetworkUtilMethods[] = {
 
 int register_android_net_NetworkUtils(JNIEnv* env)
 {
-    jclass dhcpResultsClass = env->FindClass("android/net/DhcpResults");
-    LOG_FATAL_IF(dhcpResultsClass == NULL, "Unable to find class android/net/DhcpResults");
-    dhcpResultsFieldIds.clear =
-            env->GetMethodID(dhcpResultsClass, "clear", "()V");
-    dhcpResultsFieldIds.setIpAddress =
-            env->GetMethodID(dhcpResultsClass, "setIpAddress", "(Ljava/lang/String;I)Z");
-    dhcpResultsFieldIds.setGateway =
-            env->GetMethodID(dhcpResultsClass, "setGateway", "(Ljava/lang/String;)Z");
-    dhcpResultsFieldIds.addDns =
-            env->GetMethodID(dhcpResultsClass, "addDns", "(Ljava/lang/String;)Z");
-    dhcpResultsFieldIds.setDomains =
-            env->GetMethodID(dhcpResultsClass, "setDomains", "(Ljava/lang/String;)V");
-    dhcpResultsFieldIds.setServerAddress =
-            env->GetMethodID(dhcpResultsClass, "setServerAddress", "(Ljava/lang/String;)Z");
-    dhcpResultsFieldIds.setLeaseDuration =
-            env->GetMethodID(dhcpResultsClass, "setLeaseDuration", "(I)V");
-    dhcpResultsFieldIds.setVendorInfo =
-            env->GetMethodID(dhcpResultsClass, "setVendorInfo", "(Ljava/lang/String;)V");
-
-    return AndroidRuntime::registerNativeMethods(env,
-            NETUTILS_PKG_NAME, gNetworkUtilMethods, NELEM(gNetworkUtilMethods));
+    jclass dhcpResultsClass = FindClassOrDie(env, "android/net/DhcpResults");
+
+    dhcpResultsFieldIds.clear = GetMethodIDOrDie(env, dhcpResultsClass, "clear", "()V");
+    dhcpResultsFieldIds.setIpAddress =GetMethodIDOrDie(env, dhcpResultsClass, "setIpAddress",
+            "(Ljava/lang/String;I)Z");
+    dhcpResultsFieldIds.setGateway = GetMethodIDOrDie(env, dhcpResultsClass, "setGateway",
+            "(Ljava/lang/String;)Z");
+    dhcpResultsFieldIds.addDns = GetMethodIDOrDie(env, dhcpResultsClass, "addDns",
+            "(Ljava/lang/String;)Z");
+    dhcpResultsFieldIds.setDomains = GetMethodIDOrDie(env, dhcpResultsClass, "setDomains",
+            "(Ljava/lang/String;)V");
+    dhcpResultsFieldIds.setServerAddress = GetMethodIDOrDie(env, dhcpResultsClass,
+            "setServerAddress", "(Ljava/lang/String;)Z");
+    dhcpResultsFieldIds.setLeaseDuration = GetMethodIDOrDie(env, dhcpResultsClass,
+            "setLeaseDuration", "(I)V");
+    dhcpResultsFieldIds.setVendorInfo = GetMethodIDOrDie(env, dhcpResultsClass, "setVendorInfo",
+            "(Ljava/lang/String;)V");
+
+    return RegisterMethodsOrDie(env, NETUTILS_PKG_NAME, gNetworkUtilMethods,
+                                NELEM(gNetworkUtilMethods));
 }
 
 }; // namespace android
diff --git a/core/jni/android_nio_utils.cpp b/core/jni/android_nio_utils.cpp
index 64597cc..ed8c603 100644
--- a/core/jni/android_nio_utils.cpp
+++ b/core/jni/android_nio_utils.cpp
@@ -16,6 +16,8 @@
 
 #include "android_nio_utils.h"
 
+#include "core_jni_helpers.h"
+
 struct NioJNIData {
     jclass nioAccessClass;
 
@@ -73,32 +75,19 @@ android::AutoBufferPointer::~AutoBufferPointer() {
 
 ///////////////////////////////////////////////////////////////////////////////
 
-static jclass findClass(JNIEnv* env, const char name[]) {
-    jclass c = env->FindClass(name);
-    LOG_FATAL_IF(!c, "Unable to find class %s", name);
-    return c;
-}
-
-static jmethodID findStaticMethod(JNIEnv* env, jclass c, const char method[],
-                                  const char params[]) {
-    jmethodID m = env->GetStaticMethodID(c, method, params);
-    LOG_FATAL_IF(!m, "Unable to find method %s", method);
-    return m;
-}
-
 namespace android {
 
 int register_android_nio_utils(JNIEnv* env) {
-    jclass localClass = findClass(env, "java/nio/NIOAccess");
-    gNioJNI.getBasePointerID = findStaticMethod(env, localClass,
-                                    "getBasePointer", "(Ljava/nio/Buffer;)J");
-    gNioJNI.getBaseArrayID = findStaticMethod(env, localClass,
-                    "getBaseArray", "(Ljava/nio/Buffer;)Ljava/lang/Object;");
-    gNioJNI.getBaseArrayOffsetID = findStaticMethod(env, localClass,
-                                "getBaseArrayOffset", "(Ljava/nio/Buffer;)I");
+    jclass localClass = FindClassOrDie(env, "java/nio/NIOAccess");
+    gNioJNI.getBasePointerID = GetStaticMethodIDOrDie(env, localClass, "getBasePointer",
+                                                      "(Ljava/nio/Buffer;)J");
+    gNioJNI.getBaseArrayID = GetStaticMethodIDOrDie(env, localClass, "getBaseArray",
+                                                    "(Ljava/nio/Buffer;)Ljava/lang/Object;");
+    gNioJNI.getBaseArrayOffsetID = GetStaticMethodIDOrDie(env, localClass, "getBaseArrayOffset",
+                                                          "(Ljava/nio/Buffer;)I");
 
     // now record a permanent version of the class ID
-    gNioJNI.nioAccessClass = (jclass) env->NewGlobalRef(localClass);
+    gNioJNI.nioAccessClass = MakeGlobalRefOrDie(env, localClass);
 
     return 0;
 }
diff --git a/core/jni/android_os_MessageQueue.cpp b/core/jni/android_os_MessageQueue.cpp
index 96a3e37..5d7877b 100644
--- a/core/jni/android_os_MessageQueue.cpp
+++ b/core/jni/android_os_MessageQueue.cpp
@@ -23,6 +23,8 @@
 #include <utils/Log.h>
 #include "android_os_MessageQueue.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -157,27 +159,15 @@ static JNINativeMethod gMessageQueueMethods[] = {
     { "nativeIsIdling", "(J)Z", (void*)android_os_MessageQueue_nativeIsIdling }
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
+int register_android_os_MessageQueue(JNIEnv* env) {
+    int res = RegisterMethodsOrDie(env, "android/os/MessageQueue", gMessageQueueMethods,
+                                   NELEM(gMessageQueueMethods));
+
+    jclass clazz = FindClassOrDie(env, "android/os/MessageQueue");
 
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
+    gMessageQueueClassInfo.mPtr = GetFieldIDOrDie(env, clazz, "mPtr", "J");
 
-int register_android_os_MessageQueue(JNIEnv* env) {
-    int res = jniRegisterNativeMethods(env, "android/os/MessageQueue",
-            gMessageQueueMethods, NELEM(gMessageQueueMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
-
-    jclass clazz;
-    FIND_CLASS(clazz, "android/os/MessageQueue");
-
-    GET_FIELD_ID(gMessageQueueClassInfo.mPtr, clazz,
-            "mPtr", "J");
-    
-    return 0;
+    return res;
 }
 
 } // namespace android
diff --git a/core/jni/android_os_Parcel.cpp b/core/jni/android_os_Parcel.cpp
index 884cbf1..896faa6 100644
--- a/core/jni/android_os_Parcel.cpp
+++ b/core/jni/android_os_Parcel.cpp
@@ -46,6 +46,8 @@
 
 #include <android_runtime/AndroidRuntime.h>
 
+#include "core_jni_helpers.h"
+
 //#undef ALOGV
 //#define ALOGV(...) fprintf(stderr, __VA_ARGS__)
 
@@ -741,20 +743,14 @@ const char* const kParcelPathName = "android/os/Parcel";
 
 int register_android_os_Parcel(JNIEnv* env)
 {
-    jclass clazz;
-
-    clazz = env->FindClass(kParcelPathName);
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.Parcel");
+    jclass clazz = FindClassOrDie(env, kParcelPathName);
 
-    gParcelOffsets.clazz = (jclass) env->NewGlobalRef(clazz);
-    gParcelOffsets.mNativePtr = env->GetFieldID(clazz, "mNativePtr", "J");
-    gParcelOffsets.obtain = env->GetStaticMethodID(clazz, "obtain",
-                                                   "()Landroid/os/Parcel;");
-    gParcelOffsets.recycle = env->GetMethodID(clazz, "recycle", "()V");
+    gParcelOffsets.clazz = MakeGlobalRefOrDie(env, clazz);
+    gParcelOffsets.mNativePtr = GetFieldIDOrDie(env, clazz, "mNativePtr", "J");
+    gParcelOffsets.obtain = GetStaticMethodIDOrDie(env, clazz, "obtain", "()Landroid/os/Parcel;");
+    gParcelOffsets.recycle = GetMethodIDOrDie(env, clazz, "recycle", "()V");
 
-    return AndroidRuntime::registerNativeMethods(
-        env, kParcelPathName,
-        gParcelMethods, NELEM(gParcelMethods));
+    return RegisterMethodsOrDie(env, kParcelPathName, gParcelMethods, NELEM(gParcelMethods));
 }
 
 };
diff --git a/core/jni/android_os_Trace.cpp b/core/jni/android_os_Trace.cpp
index 37d51cc..7735464 100644
--- a/core/jni/android_os_Trace.cpp
+++ b/core/jni/android_os_Trace.cpp
@@ -134,8 +134,7 @@ static JNINativeMethod gTraceMethods[] = {
 int register_android_os_Trace(JNIEnv* env) {
     int res = jniRegisterNativeMethods(env, "android/os/Trace",
             gTraceMethods, NELEM(gTraceMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
+    LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods.");
 
     return 0;
 }
diff --git a/core/jni/android_server_FingerprintManager.cpp b/core/jni/android_server_FingerprintManager.cpp
index cb17481..c8aa22f 100644
--- a/core/jni/android_server_FingerprintManager.cpp
+++ b/core/jni/android_server_FingerprintManager.cpp
@@ -24,22 +24,7 @@
 #include <hardware/fingerprint.h>
 #include <utils/Log.h>
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
-
-#define GET_STATIC_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetStaticMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find static method" methodName);
-
-#define GET_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method" methodName);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
+#include "core_jni_helpers.h"
 
 namespace android {
 
@@ -104,10 +89,12 @@ static void hal_notify_callback(fingerprint_msg_t msg) {
 
 static void nativeInit(JNIEnv *env, jobject clazz, jobject callbackObj) {
     ALOG(LOG_VERBOSE, LOG_TAG, "nativeInit()\n");
-    FIND_CLASS(gFingerprintServiceClassInfo.clazz, FINGERPRINT_SERVICE);
-    GET_METHOD_ID(gFingerprintServiceClassInfo.notify, gFingerprintServiceClassInfo.clazz,
+    gFingerprintServiceClassInfo.clazz = FindClassOrDie(env, FINGERPRINT_SERVICE);
+    gFingerprintServiceClassInfo.clazz = MakeGlobalRefOrDie(env,
+                                                            gFingerprintServiceClassInfo.clazz);
+    gFingerprintServiceClassInfo.notify = GetMethodIDOrDie(env, gFingerprintServiceClassInfo.clazz,
            "notify", "(III)V");
-    gFingerprintServiceClassInfo.callbackObject = env->NewGlobalRef(callbackObj);
+    gFingerprintServiceClassInfo.callbackObject = MakeGlobalRefOrDie(env, callbackObj);
 }
 
 static jint nativeEnroll(JNIEnv* env, jobject clazz, jint timeout) {
@@ -193,11 +180,11 @@ static const JNINativeMethod g_methods[] = {
 };
 
 int register_android_server_fingerprint_FingerprintService(JNIEnv* env) {
-    FIND_CLASS(gFingerprintServiceClassInfo.clazz, FINGERPRINT_SERVICE);
-    GET_METHOD_ID(gFingerprintServiceClassInfo.notify, gFingerprintServiceClassInfo.clazz, "notify",
-            "(III)V");
-    int result = AndroidRuntime::registerNativeMethods(
-        env, FINGERPRINT_SERVICE, g_methods, NELEM(g_methods));
+    jclass clazz = FindClassOrDie(env, FINGERPRINT_SERVICE);
+    gFingerprintServiceClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
+    gFingerprintServiceClassInfo.notify = GetMethodIDOrDie(env, gFingerprintServiceClassInfo.clazz,
+                                                           "notify", "(III)V");
+    int result = RegisterMethodsOrDie(env, FINGERPRINT_SERVICE, g_methods, NELEM(g_methods));
     ALOG(LOG_VERBOSE, LOG_TAG, "FingerprintManager JNI ready.\n");
     return result;
 }
diff --git a/core/jni/android_util_AssetManager.cpp b/core/jni/android_util_AssetManager.cpp
index b1c0738..5fb2e42 100644
--- a/core/jni/android_util_AssetManager.cpp
+++ b/core/jni/android_util_AssetManager.cpp
@@ -34,6 +34,8 @@
 
 #include <private/android_filesystem_config.h> // for AID_SYSTEM
 
+#include "core_jni_helpers.h"
+
 #include <stdio.h>
 #include <sys/types.h>
 #include <sys/wait.h>
@@ -2115,64 +2117,38 @@ static JNINativeMethod gAssetManagerMethods[] = {
 
 int register_android_content_AssetManager(JNIEnv* env)
 {
-    jclass typedValue = env->FindClass("android/util/TypedValue");
-    LOG_FATAL_IF(typedValue == NULL, "Unable to find class android/util/TypedValue");
-    gTypedValueOffsets.mType
-        = env->GetFieldID(typedValue, "type", "I");
-    LOG_FATAL_IF(gTypedValueOffsets.mType == NULL, "Unable to find TypedValue.type");
-    gTypedValueOffsets.mData
-        = env->GetFieldID(typedValue, "data", "I");
-    LOG_FATAL_IF(gTypedValueOffsets.mData == NULL, "Unable to find TypedValue.data");
-    gTypedValueOffsets.mString
-        = env->GetFieldID(typedValue, "string", "Ljava/lang/CharSequence;");
-    LOG_FATAL_IF(gTypedValueOffsets.mString == NULL, "Unable to find TypedValue.string");
-    gTypedValueOffsets.mAssetCookie
-        = env->GetFieldID(typedValue, "assetCookie", "I");
-    LOG_FATAL_IF(gTypedValueOffsets.mAssetCookie == NULL, "Unable to find TypedValue.assetCookie");
-    gTypedValueOffsets.mResourceId
-        = env->GetFieldID(typedValue, "resourceId", "I");
-    LOG_FATAL_IF(gTypedValueOffsets.mResourceId == NULL, "Unable to find TypedValue.resourceId");
-    gTypedValueOffsets.mChangingConfigurations
-        = env->GetFieldID(typedValue, "changingConfigurations", "I");
-    LOG_FATAL_IF(gTypedValueOffsets.mChangingConfigurations == NULL, "Unable to find TypedValue.changingConfigurations");
-    gTypedValueOffsets.mDensity = env->GetFieldID(typedValue, "density", "I");
-    LOG_FATAL_IF(gTypedValueOffsets.mDensity == NULL, "Unable to find TypedValue.density");
-
-    jclass assetFd = env->FindClass("android/content/res/AssetFileDescriptor");
-    LOG_FATAL_IF(assetFd == NULL, "Unable to find class android/content/res/AssetFileDescriptor");
-    gAssetFileDescriptorOffsets.mFd
-        = env->GetFieldID(assetFd, "mFd", "Landroid/os/ParcelFileDescriptor;");
-    LOG_FATAL_IF(gAssetFileDescriptorOffsets.mFd == NULL, "Unable to find AssetFileDescriptor.mFd");
-    gAssetFileDescriptorOffsets.mStartOffset
-        = env->GetFieldID(assetFd, "mStartOffset", "J");
-    LOG_FATAL_IF(gAssetFileDescriptorOffsets.mStartOffset == NULL, "Unable to find AssetFileDescriptor.mStartOffset");
-    gAssetFileDescriptorOffsets.mLength
-        = env->GetFieldID(assetFd, "mLength", "J");
-    LOG_FATAL_IF(gAssetFileDescriptorOffsets.mLength == NULL, "Unable to find AssetFileDescriptor.mLength");
-
-    jclass assetManager = env->FindClass("android/content/res/AssetManager");
-    LOG_FATAL_IF(assetManager == NULL, "Unable to find class android/content/res/AssetManager");
-    gAssetManagerOffsets.mObject
-        = env->GetFieldID(assetManager, "mObject", "J");
-    LOG_FATAL_IF(gAssetManagerOffsets.mObject == NULL, "Unable to find AssetManager.mObject");
-
-    jclass stringClass = env->FindClass("java/lang/String");
-    LOG_FATAL_IF(stringClass == NULL, "Unable to find class java/lang/String");
-    g_stringClass = (jclass)env->NewGlobalRef(stringClass);
-    LOG_FATAL_IF(g_stringClass == NULL, "Unable to create global reference for class java/lang/String");
-
-    jclass sparseArrayClass = env->FindClass("android/util/SparseArray");
-    LOG_FATAL_IF(sparseArrayClass == NULL, "Unable to find class android/util/SparseArray");
-    gSparseArrayOffsets.classObject = (jclass) env->NewGlobalRef(sparseArrayClass);
-    gSparseArrayOffsets.constructor =
-            env->GetMethodID(gSparseArrayOffsets.classObject, "<init>", "()V");
-    LOG_FATAL_IF(gSparseArrayOffsets.constructor == NULL, "Unable to find SparseArray.<init>()");
-    gSparseArrayOffsets.put =
-            env->GetMethodID(gSparseArrayOffsets.classObject, "put", "(ILjava/lang/Object;)V");
-    LOG_FATAL_IF(gSparseArrayOffsets.put == NULL, "Unable to find SparseArray.put(int, V)");
-
-    return AndroidRuntime::registerNativeMethods(env,
-            "android/content/res/AssetManager", gAssetManagerMethods, NELEM(gAssetManagerMethods));
+    jclass typedValue = FindClassOrDie(env, "android/util/TypedValue");
+    gTypedValueOffsets.mType = GetFieldIDOrDie(env, typedValue, "type", "I");
+    gTypedValueOffsets.mData = GetFieldIDOrDie(env, typedValue, "data", "I");
+    gTypedValueOffsets.mString = GetFieldIDOrDie(env, typedValue, "string",
+                                                 "Ljava/lang/CharSequence;");
+    gTypedValueOffsets.mAssetCookie = GetFieldIDOrDie(env, typedValue, "assetCookie", "I");
+    gTypedValueOffsets.mResourceId = GetFieldIDOrDie(env, typedValue, "resourceId", "I");
+    gTypedValueOffsets.mChangingConfigurations = GetFieldIDOrDie(env, typedValue,
+                                                                 "changingConfigurations", "I");
+    gTypedValueOffsets.mDensity = GetFieldIDOrDie(env, typedValue, "density", "I");
+
+    jclass assetFd = FindClassOrDie(env, "android/content/res/AssetFileDescriptor");
+    gAssetFileDescriptorOffsets.mFd = GetFieldIDOrDie(env, assetFd, "mFd",
+                                                      "Landroid/os/ParcelFileDescriptor;");
+    gAssetFileDescriptorOffsets.mStartOffset = GetFieldIDOrDie(env, assetFd, "mStartOffset", "J");
+    gAssetFileDescriptorOffsets.mLength = GetFieldIDOrDie(env, assetFd, "mLength", "J");
+
+    jclass assetManager = FindClassOrDie(env, "android/content/res/AssetManager");
+    gAssetManagerOffsets.mObject = GetFieldIDOrDie(env, assetManager, "mObject", "J");
+
+    jclass stringClass = FindClassOrDie(env, "java/lang/String");
+    g_stringClass = MakeGlobalRefOrDie(env, stringClass);
+
+    jclass sparseArrayClass = FindClassOrDie(env, "android/util/SparseArray");
+    gSparseArrayOffsets.classObject = MakeGlobalRefOrDie(env, sparseArrayClass);
+    gSparseArrayOffsets.constructor = GetMethodIDOrDie(env, gSparseArrayOffsets.classObject,
+                                                       "<init>", "()V");
+    gSparseArrayOffsets.put = GetMethodIDOrDie(env, gSparseArrayOffsets.classObject, "put",
+                                               "(ILjava/lang/Object;)V");
+
+    return RegisterMethodsOrDie(env, "android/content/res/AssetManager", gAssetManagerMethods,
+                                NELEM(gAssetManagerMethods));
 }
 
 }; // namespace android
diff --git a/core/jni/android_util_Binder.cpp b/core/jni/android_util_Binder.cpp
index 1dd6378..10a5b5a 100644
--- a/core/jni/android_util_Binder.cpp
+++ b/core/jni/android_util_Binder.cpp
@@ -48,6 +48,8 @@
 
 #include <android_runtime/AndroidRuntime.h>
 
+#include "core_jni_helpers.h"
+
 //#undef ALOGV
 //#define ALOGV(...) fprintf(stderr, __VA_ARGS__)
 
@@ -827,19 +829,11 @@ const char* const kBinderPathName = "android/os/Binder";
 
 static int int_register_android_os_Binder(JNIEnv* env)
 {
-    jclass clazz;
-
-    clazz = env->FindClass(kBinderPathName);
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.Binder");
-
-    gBinderOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
-    gBinderOffsets.mExecTransact
-        = env->GetMethodID(clazz, "execTransact", "(IJJI)Z");
-    assert(gBinderOffsets.mExecTransact);
+    jclass clazz = FindClassOrDie(env, kBinderPathName);
 
-    gBinderOffsets.mObject
-        = env->GetFieldID(clazz, "mObject", "J");
-    assert(gBinderOffsets.mObject);
+    gBinderOffsets.mClass = MakeGlobalRefOrDie(env, clazz);
+    gBinderOffsets.mExecTransact = GetMethodIDOrDie(env, clazz, "execTransact", "(IJJI)Z");
+    gBinderOffsets.mObject = GetFieldIDOrDie(env, clazz, "mObject", "J");
 
     return AndroidRuntime::registerNativeMethods(
         env, kBinderPathName,
@@ -911,15 +905,10 @@ const char* const kBinderInternalPathName = "com/android/internal/os/BinderInter
 
 static int int_register_android_os_BinderInternal(JNIEnv* env)
 {
-    jclass clazz;
+    jclass clazz = FindClassOrDie(env, kBinderInternalPathName);
 
-    clazz = env->FindClass(kBinderInternalPathName);
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class com.android.internal.os.BinderInternal");
-
-    gBinderInternalOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
-    gBinderInternalOffsets.mForceGc
-        = env->GetStaticMethodID(clazz, "forceBinderGc", "()V");
-    assert(gBinderInternalOffsets.mForceGc);
+    gBinderInternalOffsets.mClass = MakeGlobalRefOrDie(env, clazz);
+    gBinderInternalOffsets.mForceGc = GetStaticMethodIDOrDie(env, clazz, "forceBinderGc", "()V");
 
     return AndroidRuntime::registerNativeMethods(
         env, kBinderInternalPathName,
@@ -1234,37 +1223,22 @@ const char* const kBinderProxyPathName = "android/os/BinderProxy";
 
 static int int_register_android_os_BinderProxy(JNIEnv* env)
 {
-    jclass clazz;
-
-    clazz = env->FindClass("java/lang/Error");
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class java.lang.Error");
-    gErrorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
-
-    clazz = env->FindClass(kBinderProxyPathName);
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.BinderProxy");
-
-    gBinderProxyOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
-    gBinderProxyOffsets.mConstructor
-        = env->GetMethodID(clazz, "<init>", "()V");
-    assert(gBinderProxyOffsets.mConstructor);
-    gBinderProxyOffsets.mSendDeathNotice
-        = env->GetStaticMethodID(clazz, "sendDeathNotice", "(Landroid/os/IBinder$DeathRecipient;)V");
-    assert(gBinderProxyOffsets.mSendDeathNotice);
-
-    gBinderProxyOffsets.mObject
-        = env->GetFieldID(clazz, "mObject", "J");
-    assert(gBinderProxyOffsets.mObject);
-    gBinderProxyOffsets.mSelf
-        = env->GetFieldID(clazz, "mSelf", "Ljava/lang/ref/WeakReference;");
-    assert(gBinderProxyOffsets.mSelf);
-    gBinderProxyOffsets.mOrgue
-        = env->GetFieldID(clazz, "mOrgue", "J");
-    assert(gBinderProxyOffsets.mOrgue);
-
-    clazz = env->FindClass("java/lang/Class");
-    LOG_FATAL_IF(clazz == NULL, "Unable to find java.lang.Class");
-    gClassOffsets.mGetName = env->GetMethodID(clazz, "getName", "()Ljava/lang/String;");
-    assert(gClassOffsets.mGetName);
+    jclass clazz = FindClassOrDie(env, "java/lang/Error");
+    gErrorOffsets.mClass = MakeGlobalRefOrDie(env, clazz);
+
+    clazz = FindClassOrDie(env, kBinderProxyPathName);
+    gBinderProxyOffsets.mClass = MakeGlobalRefOrDie(env, clazz);
+    gBinderProxyOffsets.mConstructor = GetMethodIDOrDie(env, clazz, "<init>", "()V");
+    gBinderProxyOffsets.mSendDeathNotice = GetStaticMethodIDOrDie(env, clazz, "sendDeathNotice",
+            "(Landroid/os/IBinder$DeathRecipient;)V");
+
+    gBinderProxyOffsets.mObject = GetFieldIDOrDie(env, clazz, "mObject", "J");
+    gBinderProxyOffsets.mSelf = GetFieldIDOrDie(env, clazz, "mSelf",
+                                                "Ljava/lang/ref/WeakReference;");
+    gBinderProxyOffsets.mOrgue = GetFieldIDOrDie(env, clazz, "mOrgue", "J");
+
+    clazz = FindClassOrDie(env, "java/lang/Class");
+    gClassOffsets.mGetName = GetMethodIDOrDie(env, clazz, "getName", "()Ljava/lang/String;");
 
     return AndroidRuntime::registerNativeMethods(
         env, kBinderProxyPathName,
@@ -1284,28 +1258,20 @@ int register_android_os_Binder(JNIEnv* env)
     if (int_register_android_os_BinderProxy(env) < 0)
         return -1;
 
-    jclass clazz;
-
-    clazz = env->FindClass("android/util/Log");
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.util.Log");
-    gLogOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
-    gLogOffsets.mLogE = env->GetStaticMethodID(
-        clazz, "e", "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Throwable;)I");
-    assert(gLogOffsets.mLogE);
-
-    clazz = env->FindClass("android/os/ParcelFileDescriptor");
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.ParcelFileDescriptor");
-    gParcelFileDescriptorOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
-    gParcelFileDescriptorOffsets.mConstructor
-        = env->GetMethodID(clazz, "<init>", "(Ljava/io/FileDescriptor;)V");
-
-    clazz = env->FindClass("android/os/StrictMode");
-    LOG_FATAL_IF(clazz == NULL, "Unable to find class android.os.StrictMode");
-    gStrictModeCallbackOffsets.mClass = (jclass) env->NewGlobalRef(clazz);
-    gStrictModeCallbackOffsets.mCallback = env->GetStaticMethodID(
-        clazz, "onBinderStrictModePolicyChange", "(I)V");
-    LOG_FATAL_IF(gStrictModeCallbackOffsets.mCallback == NULL,
-                 "Unable to find strict mode callback.");
+    jclass clazz = FindClassOrDie(env, "android/util/Log");
+    gLogOffsets.mClass = MakeGlobalRefOrDie(env, clazz);
+    gLogOffsets.mLogE = GetStaticMethodIDOrDie(env, clazz, "e",
+            "(Ljava/lang/String;Ljava/lang/String;Ljava/lang/Throwable;)I");
+
+    clazz = FindClassOrDie(env, "android/os/ParcelFileDescriptor");
+    gParcelFileDescriptorOffsets.mClass = MakeGlobalRefOrDie(env, clazz);
+    gParcelFileDescriptorOffsets.mConstructor = GetMethodIDOrDie(env, clazz, "<init>",
+                                                                 "(Ljava/io/FileDescriptor;)V");
+
+    clazz = FindClassOrDie(env, "android/os/StrictMode");
+    gStrictModeCallbackOffsets.mClass = MakeGlobalRefOrDie(env, clazz);
+    gStrictModeCallbackOffsets.mCallback = GetStaticMethodIDOrDie(env, clazz,
+            "onBinderStrictModePolicyChange", "(I)V");
 
     return 0;
 }
diff --git a/core/jni/android_view_DisplayEventReceiver.cpp b/core/jni/android_view_DisplayEventReceiver.cpp
index 1ccf419..b9fbccb 100644
--- a/core/jni/android_view_DisplayEventReceiver.cpp
+++ b/core/jni/android_view_DisplayEventReceiver.cpp
@@ -28,6 +28,8 @@
 #include <gui/DisplayEventReceiver.h>
 #include "android_os_MessageQueue.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 // Number of events to read at a time from the DisplayEventReceiver pipe.
@@ -260,30 +262,19 @@ static JNINativeMethod gMethods[] = {
             (void*)nativeScheduleVsync }
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
+int register_android_view_DisplayEventReceiver(JNIEnv* env) {
+    int res = RegisterMethodsOrDie(env, "android/view/DisplayEventReceiver", gMethods,
+                                   NELEM(gMethods));
+
+    jclass clazz = FindClassOrDie(env, "android/view/DisplayEventReceiver");
+    gDisplayEventReceiverClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
 
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
+    gDisplayEventReceiverClassInfo.dispatchVsync = GetMethodIDOrDie(env,
+            gDisplayEventReceiverClassInfo.clazz, "dispatchVsync", "(JII)V");
+    gDisplayEventReceiverClassInfo.dispatchHotplug = GetMethodIDOrDie(env,
+            gDisplayEventReceiverClassInfo.clazz, "dispatchHotplug", "(JIZ)V");
 
-int register_android_view_DisplayEventReceiver(JNIEnv* env) {
-    int res = jniRegisterNativeMethods(env, "android/view/DisplayEventReceiver",
-            gMethods, NELEM(gMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
-
-    FIND_CLASS(gDisplayEventReceiverClassInfo.clazz, "android/view/DisplayEventReceiver");
-
-    GET_METHOD_ID(gDisplayEventReceiverClassInfo.dispatchVsync,
-            gDisplayEventReceiverClassInfo.clazz,
-            "dispatchVsync", "(JII)V");
-    GET_METHOD_ID(gDisplayEventReceiverClassInfo.dispatchHotplug,
-            gDisplayEventReceiverClassInfo.clazz,
-            "dispatchHotplug", "(JIZ)V");
-    return 0;
+    return res;
 }
 
 } // namespace android
diff --git a/core/jni/android_view_GLES20Canvas.cpp b/core/jni/android_view_GLES20Canvas.cpp
index 2e2b23f..759fceb 100644
--- a/core/jni/android_view_GLES20Canvas.cpp
+++ b/core/jni/android_view_GLES20Canvas.cpp
@@ -46,6 +46,8 @@
 
 #include "MinikinUtils.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 using namespace uirenderer;
@@ -971,32 +973,19 @@ static JNINativeMethod gActivityThreadMethods[] = {
                                                (void*) android_app_ActivityThread_dumpGraphics }
 };
 
-
+int register_android_view_GLES20Canvas(JNIEnv* env) {
 #ifdef USE_OPENGL_RENDERER
-    #define FIND_CLASS(var, className) \
-            var = env->FindClass(className); \
-            LOG_FATAL_IF(! var, "Unable to find class " className);
-
-    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-            var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-            LOG_FATAL_IF(! var, "Unable to find method " methodName);
-#else
-    #define FIND_CLASS(var, className)
-    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor)
+    jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
+    gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
 #endif
 
-int register_android_view_GLES20Canvas(JNIEnv* env) {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/graphics/Rect");
-    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
-
-    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
+    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
 }
 
 const char* const kActivityThreadPathName = "android/app/ActivityThread";
 
 int register_android_app_ActivityThread(JNIEnv* env) {
-    return AndroidRuntime::registerNativeMethods(env, kActivityThreadPathName,
+    return RegisterMethodsOrDie(env, kActivityThreadPathName,
             gActivityThreadMethods, NELEM(gActivityThreadMethods));
 }
 
diff --git a/core/jni/android_view_GraphicBuffer.cpp b/core/jni/android_view_GraphicBuffer.cpp
index 5ebed9c..7f1af49 100644
--- a/core/jni/android_view_GraphicBuffer.cpp
+++ b/core/jni/android_view_GraphicBuffer.cpp
@@ -38,6 +38,8 @@
 
 #include <private/gui/ComposerService.h>
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 // ----------------------------------------------------------------------------
@@ -277,18 +279,6 @@ sp<GraphicBuffer> graphicBufferForJavaObject(JNIEnv* env, jobject obj) {
 // JNI Glue
 // ----------------------------------------------------------------------------
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(!var, "Unable to find method " methodName);
-
 const char* const kClassPathName = "android/view/GraphicBuffer";
 
 static JNINativeMethod gMethods[] = {
@@ -307,22 +297,21 @@ static JNINativeMethod gMethods[] = {
 };
 
 int register_android_view_GraphicBuffer(JNIEnv* env) {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/view/GraphicBuffer");
-    GET_FIELD_ID(gGraphicBufferClassInfo.mNativeObject, clazz, "mNativeObject", "J");
-
-    FIND_CLASS(clazz, "android/graphics/Rect");
-    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
-    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
-    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
-    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
-    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
-
-    FIND_CLASS(clazz, "android/graphics/Canvas");
-    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
-    GET_METHOD_ID(gCanvasClassInfo.setNativeBitmap, clazz, "setNativeBitmap", "(J)V");
-
-    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
+    jclass clazz = FindClassOrDie(env, "android/view/GraphicBuffer");
+    gGraphicBufferClassInfo.mNativeObject = GetFieldIDOrDie(env, clazz, "mNativeObject", "J");
+
+    clazz = FindClassOrDie(env, "android/graphics/Rect");
+    gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
+    gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
+    gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
+    gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
+    gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
+
+    clazz = FindClassOrDie(env, "android/graphics/Canvas");
+    gCanvasClassInfo.mSurfaceFormat = GetFieldIDOrDie(env, clazz, "mSurfaceFormat", "I");
+    gCanvasClassInfo.setNativeBitmap = GetMethodIDOrDie(env, clazz, "setNativeBitmap", "(J)V");
+
+    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
 }
 
 };
diff --git a/core/jni/android_view_InputChannel.cpp b/core/jni/android_view_InputChannel.cpp
index b64b7c6..4b42ab5 100644
--- a/core/jni/android_view_InputChannel.cpp
+++ b/core/jni/android_view_InputChannel.cpp
@@ -26,6 +26,8 @@
 #include "android_os_Parcel.h"
 #include "android_util_Binder.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 // ----------------------------------------------------------------------------
@@ -275,34 +277,19 @@ static JNINativeMethod gInputChannelMethods[] = {
             (void*)android_view_InputChannel_nativeDup },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_view_InputChannel(JNIEnv* env) {
-    int res = jniRegisterNativeMethods(env, "android/view/InputChannel",
-            gInputChannelMethods, NELEM(gInputChannelMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
+    int res = RegisterMethodsOrDie(env, "android/view/InputChannel", gInputChannelMethods,
+                                   NELEM(gInputChannelMethods));
+
+    jclass clazz = FindClassOrDie(env, "android/view/InputChannel");
+    gInputChannelClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
 
-    FIND_CLASS(gInputChannelClassInfo.clazz, "android/view/InputChannel");
+    gInputChannelClassInfo.mPtr = GetFieldIDOrDie(env, gInputChannelClassInfo.clazz, "mPtr", "J");
 
-    GET_FIELD_ID(gInputChannelClassInfo.mPtr, gInputChannelClassInfo.clazz,
-            "mPtr", "J");
-    
-    GET_METHOD_ID(gInputChannelClassInfo.ctor, gInputChannelClassInfo.clazz,
-            "<init>", "()V");
+    gInputChannelClassInfo.ctor = GetMethodIDOrDie(env, gInputChannelClassInfo.clazz, "<init>",
+                                                   "()V");
 
-    return 0;
+    return res;
 }
 
 } // namespace android
diff --git a/core/jni/android_view_InputDevice.cpp b/core/jni/android_view_InputDevice.cpp
index bef0f84..2323f43 100644
--- a/core/jni/android_view_InputDevice.cpp
+++ b/core/jni/android_view_InputDevice.cpp
@@ -25,6 +25,8 @@
 #include "android_view_InputDevice.h"
 #include "android_view_KeyCharacterMap.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -77,24 +79,15 @@ jobject android_view_InputDevice_create(JNIEnv* env, const InputDeviceInfo& devi
 }
 
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
 int register_android_view_InputDevice(JNIEnv* env)
 {
-    FIND_CLASS(gInputDeviceClassInfo.clazz, "android/view/InputDevice");
-    gInputDeviceClassInfo.clazz = jclass(env->NewGlobalRef(gInputDeviceClassInfo.clazz));
+    gInputDeviceClassInfo.clazz = FindClassOrDie(env, "android/view/InputDevice");
+    gInputDeviceClassInfo.clazz = MakeGlobalRefOrDie(env, gInputDeviceClassInfo.clazz);
 
-    GET_METHOD_ID(gInputDeviceClassInfo.ctor, gInputDeviceClassInfo.clazz,
-            "<init>",
+    gInputDeviceClassInfo.ctor = GetMethodIDOrDie(env, gInputDeviceClassInfo.clazz, "<init>",
             "(IIILjava/lang/String;IILjava/lang/String;ZIILandroid/view/KeyCharacterMap;ZZ)V");
 
-    GET_METHOD_ID(gInputDeviceClassInfo.addMotionRange, gInputDeviceClassInfo.clazz,
+    gInputDeviceClassInfo.addMotionRange = GetMethodIDOrDie(env, gInputDeviceClassInfo.clazz,
             "addMotionRange", "(IIFFFFF)V");
 
     return 0;
diff --git a/core/jni/android_view_InputEventReceiver.cpp b/core/jni/android_view_InputEventReceiver.cpp
index 093dde8..76d626c 100644
--- a/core/jni/android_view_InputEventReceiver.cpp
+++ b/core/jni/android_view_InputEventReceiver.cpp
@@ -37,6 +37,8 @@
 
 #include <ScopedLocalRef.h>
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -408,30 +410,20 @@ static JNINativeMethod gMethods[] = {
             (void*)nativeConsumeBatchedInputEvents },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
 int register_android_view_InputEventReceiver(JNIEnv* env) {
-    int res = jniRegisterNativeMethods(env, "android/view/InputEventReceiver",
+    int res = RegisterMethodsOrDie(env, "android/view/InputEventReceiver",
             gMethods, NELEM(gMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
 
-    FIND_CLASS(gInputEventReceiverClassInfo.clazz, "android/view/InputEventReceiver");
+    jclass clazz = FindClassOrDie(env, "android/view/InputEventReceiver");
+    gInputEventReceiverClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
 
-    GET_METHOD_ID(gInputEventReceiverClassInfo.dispatchInputEvent,
+    gInputEventReceiverClassInfo.dispatchInputEvent = GetMethodIDOrDie(env,
             gInputEventReceiverClassInfo.clazz,
             "dispatchInputEvent", "(ILandroid/view/InputEvent;)V");
-    GET_METHOD_ID(gInputEventReceiverClassInfo.dispatchBatchedInputEventPending,
-            gInputEventReceiverClassInfo.clazz,
-            "dispatchBatchedInputEventPending", "()V");
-    return 0;
+    gInputEventReceiverClassInfo.dispatchBatchedInputEventPending = GetMethodIDOrDie(env,
+            gInputEventReceiverClassInfo.clazz, "dispatchBatchedInputEventPending", "()V");
+
+    return res;
 }
 
 } // namespace android
diff --git a/core/jni/android_view_InputEventSender.cpp b/core/jni/android_view_InputEventSender.cpp
index e697531..de65d0d 100644
--- a/core/jni/android_view_InputEventSender.cpp
+++ b/core/jni/android_view_InputEventSender.cpp
@@ -37,6 +37,8 @@
 
 #include <ScopedLocalRef.h>
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -299,27 +301,16 @@ static JNINativeMethod gMethods[] = {
             (void*)nativeSendMotionEvent },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
 int register_android_view_InputEventSender(JNIEnv* env) {
-    int res = jniRegisterNativeMethods(env, "android/view/InputEventSender",
-            gMethods, NELEM(gMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
+    int res = RegisterMethodsOrDie(env, "android/view/InputEventSender", gMethods, NELEM(gMethods));
+
+    jclass clazz = FindClassOrDie(env, "android/view/InputEventSender");
+    gInputEventSenderClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
 
-    FIND_CLASS(gInputEventSenderClassInfo.clazz, "android/view/InputEventSender");
+    gInputEventSenderClassInfo.dispatchInputEventFinished = GetMethodIDOrDie(
+            env, gInputEventSenderClassInfo.clazz, "dispatchInputEventFinished", "(IZ)V");
 
-    GET_METHOD_ID(gInputEventSenderClassInfo.dispatchInputEventFinished,
-            gInputEventSenderClassInfo.clazz,
-            "dispatchInputEventFinished", "(IZ)V");
-    return 0;
+    return res;
 }
 
 } // namespace android
diff --git a/core/jni/android_view_InputQueue.cpp b/core/jni/android_view_InputQueue.cpp
index 21b73b1..96ccdee 100644
--- a/core/jni/android_view_InputQueue.cpp
+++ b/core/jni/android_view_InputQueue.cpp
@@ -33,6 +33,8 @@
 #include "android_view_KeyEvent.h"
 #include "android_view_MotionEvent.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -256,27 +258,13 @@ static const JNINativeMethod g_methods[] = {
 
 static const char* const kInputQueuePathName = "android/view/InputQueue";
 
-#define FIND_CLASS(var, className) \
-        do { \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class %s", className); \
-        } while(0)
-
-#define GET_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        do { \
-        var = env->GetMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method" methodName); \
-        } while(0)
-
 int register_android_view_InputQueue(JNIEnv* env)
 {
-    jclass clazz;
-    FIND_CLASS(clazz, kInputQueuePathName);
-    GET_METHOD_ID(gInputQueueClassInfo.finishInputEvent, clazz, "finishInputEvent", "(JZ)V");
+    jclass clazz = FindClassOrDie(env, kInputQueuePathName);
+    gInputQueueClassInfo.finishInputEvent = GetMethodIDOrDie(env, clazz, "finishInputEvent",
+                                                             "(JZ)V");
 
-    return AndroidRuntime::registerNativeMethods(
-        env, kInputQueuePathName,
-        g_methods, NELEM(g_methods));
+    return RegisterMethodsOrDie(env, kInputQueuePathName, g_methods, NELEM(g_methods));
 }
 
 } // namespace android
diff --git a/core/jni/android_view_KeyCharacterMap.cpp b/core/jni/android_view_KeyCharacterMap.cpp
index 62d5129..4eed5a7 100644
--- a/core/jni/android_view_KeyCharacterMap.cpp
+++ b/core/jni/android_view_KeyCharacterMap.cpp
@@ -26,6 +26,8 @@
 #include "android_os_Parcel.h"
 #include "android_view_KeyEvent.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -221,40 +223,23 @@ static JNINativeMethod g_methods[] = {
             (void*)nativeGetEvents },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_view_KeyCharacterMap(JNIEnv* env)
 {
-    FIND_CLASS(gKeyCharacterMapClassInfo.clazz, "android/view/KeyCharacterMap");
-    gKeyCharacterMapClassInfo.clazz = jclass(env->NewGlobalRef(gKeyCharacterMapClassInfo.clazz));
+    gKeyCharacterMapClassInfo.clazz = FindClassOrDie(env, "android/view/KeyCharacterMap");
+    gKeyCharacterMapClassInfo.clazz = MakeGlobalRefOrDie(env, gKeyCharacterMapClassInfo.clazz);
 
-    GET_METHOD_ID(gKeyCharacterMapClassInfo.ctor, gKeyCharacterMapClassInfo.clazz,
+    gKeyCharacterMapClassInfo.ctor = GetMethodIDOrDie(env, gKeyCharacterMapClassInfo.clazz,
             "<init>", "(J)V");
 
-    FIND_CLASS(gKeyEventClassInfo.clazz, "android/view/KeyEvent");
-    gKeyEventClassInfo.clazz = jclass(env->NewGlobalRef(gKeyEventClassInfo.clazz));
-
-    jclass clazz;
-    FIND_CLASS(clazz, "android/view/KeyCharacterMap$FallbackAction");
+    gKeyEventClassInfo.clazz = FindClassOrDie(env, "android/view/KeyEvent");
+    gKeyEventClassInfo.clazz = MakeGlobalRefOrDie(env, gKeyEventClassInfo.clazz);
 
-    GET_FIELD_ID(gFallbackActionClassInfo.keyCode, clazz,
-            "keyCode", "I");
+    jclass clazz = FindClassOrDie(env, "android/view/KeyCharacterMap$FallbackAction");
 
-    GET_FIELD_ID(gFallbackActionClassInfo.metaState, clazz,
-            "metaState", "I");
+    gFallbackActionClassInfo.keyCode = GetFieldIDOrDie(env, clazz, "keyCode", "I");
+    gFallbackActionClassInfo.metaState = GetFieldIDOrDie(env, clazz, "metaState", "I");
 
-    return AndroidRuntime::registerNativeMethods(env,
-            "android/view/KeyCharacterMap", g_methods, NELEM(g_methods));
+    return RegisterMethodsOrDie(env, "android/view/KeyCharacterMap", g_methods, NELEM(g_methods));
 }
 
 }; // namespace android
diff --git a/core/jni/android_view_KeyEvent.cpp b/core/jni/android_view_KeyEvent.cpp
index 7ae21a7..216e6f6 100644
--- a/core/jni/android_view_KeyEvent.cpp
+++ b/core/jni/android_view_KeyEvent.cpp
@@ -25,6 +25,8 @@
 #include <ScopedUtfChars.h>
 #include "android_view_KeyEvent.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 // ----------------------------------------------------------------------------
@@ -124,56 +126,32 @@ static const JNINativeMethod g_methods[] = {
         (void*)android_view_KeyEvent_nativeKeyCodeFromString},
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
-
-#define GET_STATIC_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetStaticMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find static method" methodName);
-
-#define GET_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method" methodName);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_view_KeyEvent(JNIEnv* env) {
-    FIND_CLASS(gKeyEventClassInfo.clazz, "android/view/KeyEvent");
+    jclass clazz = FindClassOrDie(env, "android/view/KeyEvent");
+    gKeyEventClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
 
-    GET_STATIC_METHOD_ID(gKeyEventClassInfo.obtain, gKeyEventClassInfo.clazz,
+    gKeyEventClassInfo.obtain = GetStaticMethodIDOrDie(env, gKeyEventClassInfo.clazz,
             "obtain", "(JJIIIIIIIILjava/lang/String;)Landroid/view/KeyEvent;");
-    GET_METHOD_ID(gKeyEventClassInfo.recycle, gKeyEventClassInfo.clazz,
+    gKeyEventClassInfo.recycle = GetMethodIDOrDie(env, gKeyEventClassInfo.clazz,
             "recycle", "()V");
 
-    GET_FIELD_ID(gKeyEventClassInfo.mDeviceId, gKeyEventClassInfo.clazz,
-            "mDeviceId", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mSource, gKeyEventClassInfo.clazz,
-            "mSource", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mMetaState, gKeyEventClassInfo.clazz,
-            "mMetaState", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mAction, gKeyEventClassInfo.clazz,
-            "mAction", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mKeyCode, gKeyEventClassInfo.clazz,
-            "mKeyCode", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mScanCode, gKeyEventClassInfo.clazz,
-            "mScanCode", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mRepeatCount, gKeyEventClassInfo.clazz,
-            "mRepeatCount", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mFlags, gKeyEventClassInfo.clazz,
-            "mFlags", "I");
-    GET_FIELD_ID(gKeyEventClassInfo.mDownTime, gKeyEventClassInfo.clazz,
-            "mDownTime", "J");
-    GET_FIELD_ID(gKeyEventClassInfo.mEventTime, gKeyEventClassInfo.clazz,
-            "mEventTime", "J");
-    GET_FIELD_ID(gKeyEventClassInfo.mCharacters, gKeyEventClassInfo.clazz,
-            "mCharacters", "Ljava/lang/String;");
-
-    return AndroidRuntime::registerNativeMethods(
-        env, "android/view/KeyEvent", g_methods, NELEM(g_methods));
+    gKeyEventClassInfo.mDeviceId = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDeviceId", "I");
+    gKeyEventClassInfo.mSource = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mSource", "I");
+    gKeyEventClassInfo.mMetaState = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mMetaState",
+                                                    "I");
+    gKeyEventClassInfo.mAction = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mAction", "I");
+    gKeyEventClassInfo.mKeyCode = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mKeyCode", "I");
+    gKeyEventClassInfo.mScanCode = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mScanCode", "I");
+    gKeyEventClassInfo.mRepeatCount = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mRepeatCount",
+                                                      "I");
+    gKeyEventClassInfo.mFlags = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mFlags", "I");
+    gKeyEventClassInfo.mDownTime = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mDownTime", "J");
+    gKeyEventClassInfo.mEventTime = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mEventTime",
+                                                    "J");
+    gKeyEventClassInfo.mCharacters = GetFieldIDOrDie(env, gKeyEventClassInfo.clazz, "mCharacters",
+                                                     "Ljava/lang/String;");
+
+    return RegisterMethodsOrDie(env, "android/view/KeyEvent", g_methods, NELEM(g_methods));
 }
 
 } // namespace android
diff --git a/core/jni/android_view_MotionEvent.cpp b/core/jni/android_view_MotionEvent.cpp
index 318acbb..e622768 100644
--- a/core/jni/android_view_MotionEvent.cpp
+++ b/core/jni/android_view_MotionEvent.cpp
@@ -29,6 +29,8 @@
 #include "android_util_Binder.h"
 #include "android/graphics/Matrix.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 // ----------------------------------------------------------------------------
@@ -852,72 +854,41 @@ static JNINativeMethod gMotionEventMethods[] = {
             (void*)android_view_MotionEvent_nativeAxisFromString },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_STATIC_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetStaticMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find static method" methodName);
-
-#define GET_METHOD_ID(var, clazz, methodName, fieldDescriptor) \
-        var = env->GetMethodID(clazz, methodName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method" methodName);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_view_MotionEvent(JNIEnv* env) {
-    int res = jniRegisterNativeMethods(env, "android/view/MotionEvent",
-            gMotionEventMethods, NELEM(gMotionEventMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
+    int res = RegisterMethodsOrDie(env, "android/view/MotionEvent", gMotionEventMethods,
+                                   NELEM(gMotionEventMethods));
 
-    FIND_CLASS(gMotionEventClassInfo.clazz, "android/view/MotionEvent");
-    gMotionEventClassInfo.clazz = jclass(env->NewGlobalRef(gMotionEventClassInfo.clazz));
+    gMotionEventClassInfo.clazz = FindClassOrDie(env, "android/view/MotionEvent");
+    gMotionEventClassInfo.clazz = MakeGlobalRefOrDie(env, gMotionEventClassInfo.clazz);
 
-    GET_STATIC_METHOD_ID(gMotionEventClassInfo.obtain, gMotionEventClassInfo.clazz,
+    gMotionEventClassInfo.obtain = GetStaticMethodIDOrDie(env, gMotionEventClassInfo.clazz,
             "obtain", "()Landroid/view/MotionEvent;");
-    GET_METHOD_ID(gMotionEventClassInfo.recycle, gMotionEventClassInfo.clazz,
+    gMotionEventClassInfo.recycle = GetMethodIDOrDie(env, gMotionEventClassInfo.clazz,
             "recycle", "()V");
-    GET_FIELD_ID(gMotionEventClassInfo.mNativePtr, gMotionEventClassInfo.clazz,
+    gMotionEventClassInfo.mNativePtr = GetFieldIDOrDie(env, gMotionEventClassInfo.clazz,
             "mNativePtr", "J");
 
-    jclass clazz;
-    FIND_CLASS(clazz, "android/view/MotionEvent$PointerCoords");
-
-    GET_FIELD_ID(gPointerCoordsClassInfo.mPackedAxisBits, clazz,
-            "mPackedAxisBits", "J");
-    GET_FIELD_ID(gPointerCoordsClassInfo.mPackedAxisValues, clazz,
-            "mPackedAxisValues", "[F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.x, clazz,
-            "x", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.y, clazz,
-            "y", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.pressure, clazz,
-            "pressure", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.size, clazz,
-            "size", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.touchMajor, clazz,
-            "touchMajor", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.touchMinor, clazz,
-            "touchMinor", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.toolMajor, clazz,
-            "toolMajor", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.toolMinor, clazz,
-            "toolMinor", "F");
-    GET_FIELD_ID(gPointerCoordsClassInfo.orientation, clazz,
-            "orientation", "F");
-
-    FIND_CLASS(clazz, "android/view/MotionEvent$PointerProperties");
-
-    GET_FIELD_ID(gPointerPropertiesClassInfo.id, clazz,
-            "id", "I");
-    GET_FIELD_ID(gPointerPropertiesClassInfo.toolType, clazz,
-            "toolType", "I");
+    jclass clazz = FindClassOrDie(env, "android/view/MotionEvent$PointerCoords");
 
-    return 0;
+    gPointerCoordsClassInfo.mPackedAxisBits = GetFieldIDOrDie(env, clazz, "mPackedAxisBits", "J");
+    gPointerCoordsClassInfo.mPackedAxisValues = GetFieldIDOrDie(env, clazz, "mPackedAxisValues",
+                                                                "[F");
+    gPointerCoordsClassInfo.x = GetFieldIDOrDie(env, clazz, "x", "F");
+    gPointerCoordsClassInfo.y = GetFieldIDOrDie(env, clazz, "y", "F");
+    gPointerCoordsClassInfo.pressure = GetFieldIDOrDie(env, clazz, "pressure", "F");
+    gPointerCoordsClassInfo.size = GetFieldIDOrDie(env, clazz, "size", "F");
+    gPointerCoordsClassInfo.touchMajor = GetFieldIDOrDie(env, clazz, "touchMajor", "F");
+    gPointerCoordsClassInfo.touchMinor = GetFieldIDOrDie(env, clazz, "touchMinor", "F");
+    gPointerCoordsClassInfo.toolMajor = GetFieldIDOrDie(env, clazz, "toolMajor", "F");
+    gPointerCoordsClassInfo.toolMinor = GetFieldIDOrDie(env, clazz, "toolMinor", "F");
+    gPointerCoordsClassInfo.orientation = GetFieldIDOrDie(env, clazz, "orientation", "F");
+
+    clazz = FindClassOrDie(env, "android/view/MotionEvent$PointerProperties");
+
+    gPointerPropertiesClassInfo.id = GetFieldIDOrDie(env, clazz, "id", "I");
+    gPointerPropertiesClassInfo.toolType = GetFieldIDOrDie(env, clazz, "toolType", "I");
+
+    return res;
 }
 
 } // namespace android
diff --git a/core/jni/android_view_PointerIcon.cpp b/core/jni/android_view_PointerIcon.cpp
index 5e29213..bbd031e 100644
--- a/core/jni/android_view_PointerIcon.cpp
+++ b/core/jni/android_view_PointerIcon.cpp
@@ -25,6 +25,8 @@
 #include <utils/Log.h>
 #include <android/graphics/GraphicsJNI.h>
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 static struct {
@@ -106,42 +108,26 @@ status_t android_view_PointerIcon_loadSystemIcon(JNIEnv* env, jobject contextObj
 
 // --- JNI Registration ---
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className); \
-        var = jclass(env->NewGlobalRef(var));
-
-#define GET_STATIC_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetStaticMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
-
 int register_android_view_PointerIcon(JNIEnv* env) {
-    FIND_CLASS(gPointerIconClassInfo.clazz, "android/view/PointerIcon");
+    jclass clazz = FindClassOrDie(env, "android/view/PointerIcon");
+    gPointerIconClassInfo.clazz = MakeGlobalRefOrDie(env, clazz);
 
-    GET_FIELD_ID(gPointerIconClassInfo.mBitmap, gPointerIconClassInfo.clazz,
+    gPointerIconClassInfo.mBitmap = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
             "mBitmap", "Landroid/graphics/Bitmap;");
 
-    GET_FIELD_ID(gPointerIconClassInfo.mStyle, gPointerIconClassInfo.clazz,
+    gPointerIconClassInfo.mStyle = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
             "mStyle", "I");
 
-    GET_FIELD_ID(gPointerIconClassInfo.mHotSpotX, gPointerIconClassInfo.clazz,
+    gPointerIconClassInfo.mHotSpotX = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
             "mHotSpotX", "F");
 
-    GET_FIELD_ID(gPointerIconClassInfo.mHotSpotY, gPointerIconClassInfo.clazz,
+    gPointerIconClassInfo.mHotSpotY = GetFieldIDOrDie(env, gPointerIconClassInfo.clazz,
             "mHotSpotY", "F");
 
-    GET_STATIC_METHOD_ID(gPointerIconClassInfo.getSystemIcon, gPointerIconClassInfo.clazz,
+    gPointerIconClassInfo.getSystemIcon = GetStaticMethodIDOrDie(env, gPointerIconClassInfo.clazz,
             "getSystemIcon", "(Landroid/content/Context;I)Landroid/view/PointerIcon;");
 
-    GET_METHOD_ID(gPointerIconClassInfo.load, gPointerIconClassInfo.clazz,
+    gPointerIconClassInfo.load = GetMethodIDOrDie(env, gPointerIconClassInfo.clazz,
             "load", "(Landroid/content/Context;)Landroid/view/PointerIcon;");
 
     return 0;
diff --git a/core/jni/android_view_RenderNode.cpp b/core/jni/android_view_RenderNode.cpp
index 050037e..d1e693b 100644
--- a/core/jni/android_view_RenderNode.cpp
+++ b/core/jni/android_view_RenderNode.cpp
@@ -28,6 +28,8 @@
 #include <RenderNode.h>
 #include <Paint.h>
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 using namespace uirenderer;
@@ -551,21 +553,8 @@ static JNINativeMethod gMethods[] = {
 #endif
 };
 
-#ifdef USE_OPENGL_RENDERER
-    #define FIND_CLASS(var, className) \
-            var = env->FindClass(className); \
-            LOG_FATAL_IF(! var, "Unable to find class " className);
-
-    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-            var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-            LOG_FATAL_IF(! var, "Unable to find method " methodName);
-#else
-    #define FIND_CLASS(var, className)
-    #define GET_METHOD_ID(var, clazz, methodName, methodDescriptor)
-#endif
-
 int register_android_view_RenderNode(JNIEnv* env) {
-    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
+    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
 }
 
 };
diff --git a/core/jni/android_view_RenderNodeAnimator.cpp b/core/jni/android_view_RenderNodeAnimator.cpp
index ae42219..90b311a 100644
--- a/core/jni/android_view_RenderNodeAnimator.cpp
+++ b/core/jni/android_view_RenderNodeAnimator.cpp
@@ -25,6 +25,8 @@
 #include <Interpolator.h>
 #include <RenderProperties.h>
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 using namespace uirenderer;
@@ -197,22 +199,16 @@ static JNINativeMethod gMethods[] = {
 #endif
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
-
-#define GET_STATIC_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetStaticMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find method " methodName);
-
 int register_android_view_RenderNodeAnimator(JNIEnv* env) {
-    FIND_CLASS(gRenderNodeAnimatorClassInfo.clazz, kClassPathName);
-    gRenderNodeAnimatorClassInfo.clazz = jclass(env->NewGlobalRef(gRenderNodeAnimatorClassInfo.clazz));
+    gRenderNodeAnimatorClassInfo.clazz = FindClassOrDie(env, kClassPathName);
+    gRenderNodeAnimatorClassInfo.clazz = MakeGlobalRefOrDie(env,
+                                                            gRenderNodeAnimatorClassInfo.clazz);
 
-    GET_STATIC_METHOD_ID(gRenderNodeAnimatorClassInfo.callOnFinished, gRenderNodeAnimatorClassInfo.clazz,
-            "callOnFinished", "(Landroid/view/RenderNodeAnimator;)V");
+    gRenderNodeAnimatorClassInfo.callOnFinished = GetStaticMethodIDOrDie(
+            env, gRenderNodeAnimatorClassInfo.clazz, "callOnFinished",
+            "(Landroid/view/RenderNodeAnimator;)V");
 
-    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
+    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
 }
 
 
diff --git a/core/jni/android_view_TextureView.cpp b/core/jni/android_view_TextureView.cpp
index 5c04a78..011c326 100644
--- a/core/jni/android_view_TextureView.cpp
+++ b/core/jni/android_view_TextureView.cpp
@@ -31,6 +31,8 @@
 
 #include "android/graphics/GraphicsJNI.h"
 
+#include "core_jni_helpers.h"
+
 namespace android {
 
 // ----------------------------------------------------------------------------
@@ -212,35 +214,22 @@ static JNINativeMethod gMethods[] = {
             (void*) android_view_TextureView_unlockCanvasAndPost },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(!var, "Unable to find class " className);
+int register_android_view_TextureView(JNIEnv* env) {
+    jclass clazz = FindClassOrDie(env, "android/graphics/Rect");
+    gRectClassInfo.set = GetMethodIDOrDie(env, clazz, "set", "(IIII)V");
+    gRectClassInfo.left = GetFieldIDOrDie(env, clazz, "left", "I");
+    gRectClassInfo.top = GetFieldIDOrDie(env, clazz, "top", "I");
+    gRectClassInfo.right = GetFieldIDOrDie(env, clazz, "right", "I");
+    gRectClassInfo.bottom = GetFieldIDOrDie(env, clazz, "bottom", "I");
 
-#define GET_METHOD_ID(var, clazz, methodName, methodDescriptor) \
-        var = env->GetMethodID(clazz, methodName, methodDescriptor); \
-        LOG_FATAL_IF(!var, "Unable to find method " methodName);
+    clazz = FindClassOrDie(env, "android/graphics/Canvas");
+    gCanvasClassInfo.mSurfaceFormat = GetFieldIDOrDie(env, clazz, "mSurfaceFormat", "I");
+    gCanvasClassInfo.setNativeBitmap = GetMethodIDOrDie(env, clazz, "setNativeBitmap", "(J)V");
 
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(!var, "Unable to find field" fieldName);
+    clazz = FindClassOrDie(env, "android/view/TextureView");
+    gTextureViewClassInfo.nativeWindow = GetFieldIDOrDie(env, clazz, "mNativeWindow", "J");
 
-int register_android_view_TextureView(JNIEnv* env) {
-    jclass clazz;
-    FIND_CLASS(clazz, "android/graphics/Rect");
-    GET_METHOD_ID(gRectClassInfo.set, clazz, "set", "(IIII)V");
-    GET_FIELD_ID(gRectClassInfo.left, clazz, "left", "I");
-    GET_FIELD_ID(gRectClassInfo.top, clazz, "top", "I");
-    GET_FIELD_ID(gRectClassInfo.right, clazz, "right", "I");
-    GET_FIELD_ID(gRectClassInfo.bottom, clazz, "bottom", "I");
-
-    FIND_CLASS(clazz, "android/graphics/Canvas");
-    GET_FIELD_ID(gCanvasClassInfo.mSurfaceFormat, clazz, "mSurfaceFormat", "I");
-    GET_METHOD_ID(gCanvasClassInfo.setNativeBitmap, clazz, "setNativeBitmap", "(J)V");
-
-    FIND_CLASS(clazz, "android/view/TextureView");
-    GET_FIELD_ID(gTextureViewClassInfo.nativeWindow, clazz, "mNativeWindow", "J");
-
-    return AndroidRuntime::registerNativeMethods(env, kClassPathName, gMethods, NELEM(gMethods));
+    return RegisterMethodsOrDie(env, kClassPathName, gMethods, NELEM(gMethods));
 }
 
 };
diff --git a/core/jni/android_view_VelocityTracker.cpp b/core/jni/android_view_VelocityTracker.cpp
index 49d4da0..ddd5fc8 100644
--- a/core/jni/android_view_VelocityTracker.cpp
+++ b/core/jni/android_view_VelocityTracker.cpp
@@ -26,6 +26,7 @@
 
 #include <ScopedUtfChars.h>
 
+#include "core_jni_helpers.h"
 
 namespace android {
 
@@ -242,32 +243,18 @@ static JNINativeMethod gVelocityTrackerMethods[] = {
             (void*)android_view_VelocityTracker_nativeGetEstimator },
 };
 
-#define FIND_CLASS(var, className) \
-        var = env->FindClass(className); \
-        LOG_FATAL_IF(! var, "Unable to find class " className);
+int register_android_view_VelocityTracker(JNIEnv* env) {
+    int res = RegisterMethodsOrDie(env, "android/view/VelocityTracker", gVelocityTrackerMethods,
+                                   NELEM(gVelocityTrackerMethods));
 
-#define GET_FIELD_ID(var, clazz, fieldName, fieldDescriptor) \
-        var = env->GetFieldID(clazz, fieldName, fieldDescriptor); \
-        LOG_FATAL_IF(! var, "Unable to find field " fieldName);
+    jclass clazz = FindClassOrDie(env, "android/view/VelocityTracker$Estimator");
 
-int register_android_view_VelocityTracker(JNIEnv* env) {
-    int res = jniRegisterNativeMethods(env, "android/view/VelocityTracker",
-            gVelocityTrackerMethods, NELEM(gVelocityTrackerMethods));
-    LOG_FATAL_IF(res < 0, "Unable to register native methods.");
-    (void)res;
-
-    jclass clazz;
-    FIND_CLASS(clazz, "android/view/VelocityTracker$Estimator");
-
-    GET_FIELD_ID(gEstimatorClassInfo.xCoeff, clazz,
-            "xCoeff", "[F");
-    GET_FIELD_ID(gEstimatorClassInfo.yCoeff, clazz,
-            "yCoeff", "[F");
-    GET_FIELD_ID(gEstimatorClassInfo.degree, clazz,
-            "degree", "I");
-    GET_FIELD_ID(gEstimatorClassInfo.confidence, clazz,
-            "confidence", "F");
-    return 0;
+    gEstimatorClassInfo.xCoeff = GetFieldIDOrDie(env, clazz, "xCoeff", "[F");
+    gEstimatorClassInfo.yCoeff = GetFieldIDOrDie(env, clazz, "yCoeff", "[F");
+    gEstimatorClassInfo.degree = GetFieldIDOrDie(env, clazz, "degree", "I");
+    gEstimatorClassInfo.confidence = GetFieldIDOrDie(env, clazz, "confidence", "F");
+
+    return res;
 }
 
 } // namespace android
diff --git a/core/jni/core_jni_helpers.h b/core/jni/core_jni_helpers.h
new file mode 100644
index 0000000..3f169c3
--- /dev/null
+++ b/core/jni/core_jni_helpers.h
@@ -0,0 +1,77 @@
+/*
+ * Copyright (C) 2014 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef CORE_JNI_HELPERS
+#define CORE_JNI_HELPERS
+
+#include "JNIHelp.h"
+#include <android_runtime/AndroidRuntime.h>
+
+namespace android {
+
+// Defines some helpful functions.
+
+static inline jclass FindClassOrDie(JNIEnv* env, const char* class_name) {
+    jclass clazz = env->FindClass(class_name);
+    LOG_ALWAYS_FATAL_IF(clazz == NULL, "Unable to find class %s", class_name);
+    return clazz;
+}
+
+static inline jfieldID GetFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name,
+                                       const char* field_signature) {
+    jfieldID res = env->GetFieldID(clazz, field_name, field_signature);
+    LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name);
+    return res;
+}
+
+static inline jmethodID GetMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name,
+                                         const char* method_signature) {
+    jmethodID res = env->GetMethodID(clazz, method_name, method_signature);
+    LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find method %s", method_name);
+    return res;
+}
+
+static inline jfieldID GetStaticFieldIDOrDie(JNIEnv* env, jclass clazz, const char* field_name,
+                                             const char* field_signature) {
+    jfieldID res = env->GetStaticFieldID(clazz, field_name, field_signature);
+    LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static field %s", field_name);
+    return res;
+}
+
+static inline jmethodID GetStaticMethodIDOrDie(JNIEnv* env, jclass clazz, const char* method_name,
+                                               const char* method_signature) {
+    jmethodID res = env->GetStaticMethodID(clazz, method_name, method_signature);
+    LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to find static method %s", method_name);
+    return res;
+}
+
+template <typename T>
+static inline T MakeGlobalRefOrDie(JNIEnv* env, T in) {
+    jobject res = env->NewGlobalRef(in);
+    LOG_ALWAYS_FATAL_IF(res == NULL, "Unable to create global reference.");
+    return static_cast<T>(res);
+}
+
+static inline int RegisterMethodsOrDie(JNIEnv* env, const char* className,
+                                       const JNINativeMethod* gMethods, int numMethods) {
+    int res = AndroidRuntime::registerNativeMethods(env, className, gMethods, numMethods);
+    LOG_ALWAYS_FATAL_IF(res < 0, "Unable to register native methods.");
+    return res;
+}
+
+}  // namespace android
+
+#endif  // CORE_JNI_HELPERS