1 files changed, 2 insertions, 2 deletions
diff --git a/luni/src/main/java/java/lang/AbstractStringBuilder.java b/luni/src/main/java/java/lang/AbstractStringBuilder.java
index baab47d..c3107f2 100644
--- a/luni/src/main/java/java/lang/AbstractStringBuilder.java
+++ b/luni/src/main/java/java/lang/AbstractStringBuilder.java
@@ -77,7 +77,7 @@ abstract class AbstractStringBuilder {
 
     AbstractStringBuilder(int capacity) {
         if (capacity < 0) {
-            throw new NegativeArraySizeException();
+            throw new NegativeArraySizeException(Integer.toString(capacity));
         }
         value = new char[capacity];
     }
@@ -437,7 +437,7 @@ abstract class AbstractStringBuilder {
             }
             if (start == end) {
                 if (string == null) {
-                    throw new NullPointerException();
+                    throw new NullPointerException("string == null");
                 }
                 insert0(start, string);
                 return;