When no clear() is generated, still initialize fields.

https://android-review.googlesource.com/#/c/67890/ removed field
initialization from the ctor, making it just call clear() instead.

When I added the generate_clear option back (as part of the reftypes
compat mode) in https://android-review.googlesource.com/#/c/109530/,
I forgot to ensure that what clear() used to do was inlined in the
constructor.

This change fixes NPEs that are happening for users of
reftypes_compat_mode who rely on unset repeated fields being empty
arrays rather than null.

Change-Id: Idb58746c60f4a4054b7ebb5c3b0e76b16ff88184

2 files changed, 12 insertions, 0 deletions

diff --git a/java/pom.xml b/java/pom.xml
index d263bec..1f110d9 100644
--- a/java/pom.xml
+++ b/java/pom.xml
@@ -211,6 +211,12 @@
                   <arg value="--proto_path=src/test/java" />
                   <arg value="../src/google/protobuf/unittest_reference_types_nano.proto" />
                 </exec>
+                <exec executable="../src/protoc">
+                  <arg value="--javanano_out=optional_field_style=reftypes_compat_mode,generate_equals=true,java_outer_classname=google/protobuf/unittest_reference_types_nano.proto|NanoReferenceTypesCompat:target/generated-test-sources" />
+                  <arg value="--proto_path=../src" />
+                  <arg value="--proto_path=src/test/java" />
+                  <arg value="../src/google/protobuf/unittest_reference_types_nano.proto" />
+                </exec>
               </tasks>
               <testSourceRoot>target/generated-test-sources</testSourceRoot>
               <!--testSourceRoot>target/generated-test-sources/opt-space</testSourceRoot-->
diff --git a/java/src/test/java/com/google/protobuf/NanoTest.java b/java/src/test/java/com/google/protobuf/NanoTest.java
index aa555c8..81e57c0 100644
--- a/java/src/test/java/com/google/protobuf/NanoTest.java
+++ b/java/src/test/java/com/google/protobuf/NanoTest.java
@@ -49,6 +49,7 @@ import com.google.protobuf.nano.NanoHasOuterClass.TestAllTypesNanoHas;
 import com.google.protobuf.nano.NanoOuterClass;
 import com.google.protobuf.nano.NanoOuterClass.TestAllTypesNano;
 import com.google.protobuf.nano.NanoReferenceTypes;
+import com.google.protobuf.nano.NanoReferenceTypesCompat;
 import com.google.protobuf.nano.NanoRepeatedPackables;
 import com.google.protobuf.nano.PackedExtensions;
 import com.google.protobuf.nano.RepeatedExtensions;
@@ -3789,6 +3790,11 @@ public class NanoTest extends TestCase {
     assertTrue(Arrays.equals(new boolean[] {false, true, false, true}, nonPacked.bools));
   }
 
+  public void testRepeatedFieldInitializedInReftypesCompatMode() {
+    NanoReferenceTypesCompat.TestAllTypesNano proto = new NanoReferenceTypesCompat.TestAllTypesNano();
+    assertNotNull(proto.repeatedString);
+  }
+
   private void assertRepeatedPackablesEqual(
       NanoRepeatedPackables.NonPacked nonPacked, NanoRepeatedPackables.Packed packed) {
     // Not using MessageNano.equals() -- that belongs to a separate test.