[VMCore] assertation error in vm_shutdown_stop_java_threads()

[tingpeng wu]

Hi, all,
I have a question which needs your help. Method
vm_shutdown_stop_java_threads() has following statements:

    *jfieldID lock_field_id = jni_env->GetStaticFieldID(class_handle,
"lock", "Ljava/lang/ThreadGroup$ThreadGroupLock;");
    assert(lock_field_id);*
**
Anyone can tell me the role of assertation statement here. If the
assertation error happens, what is the possible reason. Thanks.

Regards,
tingpeng