--- a/src/share/vm/runtime/javaCalls.cpp	Tue Apr 07 11:20:51 2015 +0200
+++ b/src/share/vm/runtime/javaCalls.cpp	Tue Apr 07 14:58:49 2015 +0200
@@ -329,6 +329,10 @@
 }
 
 void JavaCalls::call_helper(JavaValue* result, methodHandle* m, JavaCallArguments* args, TRAPS) {
+  // During dumping, Java execution environment is not fully initialized. Also, Java execution
+  // may cause undesirable side-effects in the class metadata.
+  assert(!DumpSharedSpaces, "must not execute Java bytecodes when dumping");
+
   methodHandle method = *m;
   JavaThread* thread = (JavaThread*)THREAD;
   assert(thread->is_Java_thread(), "must be called by a java thread");