diff -r 710f8deef989 -r be2fc37a817f hotspot/src/share/vm/prims/jvm.cpp
--- a/hotspot/src/share/vm/prims/jvm.cpp	Wed Nov 12 11:01:31 2008 -0800
+++ b/hotspot/src/share/vm/prims/jvm.cpp	Wed Nov 12 22:33:26 2008 -0800
@@ -744,6 +744,7 @@
 
 // common code for JVM_DefineClass() and JVM_DefineClassWithSource()
 static jclass jvm_define_class_common(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd, const char *source, TRAPS) {
+  if (source == NULL)  source = "__JVM_DefineClass__";
 
   // Since exceptions can be thrown, class initialization can take place
   // if name is NULL no check for class name in .class stream has to be made.
@@ -782,7 +783,7 @@
 JVM_ENTRY(jclass, JVM_DefineClass(JNIEnv *env, const char *name, jobject loader, const jbyte *buf, jsize len, jobject pd))
   JVMWrapper2("JVM_DefineClass %s", name);
 
-  return jvm_define_class_common(env, name, loader, buf, len, pd, "__JVM_DefineClass__", THREAD);
+  return jvm_define_class_common(env, name, loader, buf, len, pd, NULL, THREAD);
 JVM_END