[android-developers] Native pthread->Java->Native ===> Crash, why?

I've created a native pthread from Java onCreate() and doing a loop to
call a Java function. It works fine!

But, when I call a Native function from this called Java function
(Native pthread->Java function->Native), then I got an app crash.

Why? And what can I do against this crash?

// * Called from Java onCreate() *

int startThread() {

if ((*vm)->GetEnv(vm, (void**)&jni_env, JNI_VERSION_1_6)){
return;
}

java_classname = (*jni_env)->FindClass(jni_env, "com/x/y/ZService");
if(java_classname == NULL) return 0;

javaMethod_javaEvent = (*jni_env)->GetMethodID(jni_env,
java_classname,"javaEventFunction", "(IIII)V");
if(javaMethod_javaEvent == NULL)return 0 ;

pthread_create(&realEventThread, NULL, getRealEvents, NULL);

return 1;
}

void *getRealEvents( void *ptr ) {

JNIEnv *env;

(*vm)->AttachCurrentThread(vm, &env, 0);

usleep (1000000);

while(isRunning == true) {

usleep (200000);

(*env)->CallVoidMethod(env, java_classname, javaMethod_javaEvent);

}

(*vm)->DetachCurrentThread(vm);

}

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