The following is a somewhat common pattern in the debug agent:

    if (JNI_FUNC_PTR(env,ExceptionCheck)(env)) {
        JNI_FUNC_PTR(env,ExceptionClear)(env); // keep -Xcheck:jni happy
        ERROR_MESSAGE(("JNI Exception occurred calling Module.getName()"));
        EXIT_ERROR(AGENT_ERROR_JNI_EXCEPTION, NULL);
    }

It would be useful to print the exception when this code is executed and also create a utility function or macro to handle all of this. Something like EXIT_ERROR_ON_EXCEPTION.