System.java Development Question

[mr rupplin]

Hello.

I'm not sure if there's a minor typo but I cannot find the error in it.  Can you guys look? In System.c we have:


JNIEXPORT void JNICALL
Java_java_lang_System_setMemoryAllocationListener0(JNIEnv *env, jclass cla, jobject listener)
{
    jfieldID fid =   (*env)->GetStaticFieldID(env,cla,"memoryAllocationListener","Ljava/lang/memory/MemoryAllocationListener;");

    if (fid == 0)
        return;

    (*env)->SetStaticObjectField(env,cla,fid,listener);
}

-- -- -- -- --

And in System.java we have:

    public static final MemoryAllocationListener memoryAllocationListener = null;


...

    public static void setMemoryAllocationListener(MemoryAllocationListener memoryAllocationListener) {
        checkMalloc();
        setMemoryAllocationListener0(memoryAllocationListener);
    }


...


    //SecureJVM private
    private static native void setMemoryAllocationListener0(MemoryAllocationListener memoryAllocationListener);


-- -- -- -- --


We get the following after running a trivial Java program:

Exception in thread "main" java.lang.UnsatisfiedLinkError: java.lang.System.setMemoryAllocationListener0(Ljava/lang/memory/MemoryAllocationListener;)V
at java.base/java.lang.System.setMemoryAllocationListener0(Native Method)
at java.base/java.lang.System.setMemoryAllocationListener(System.java:261)
at Hope.<init>(Hope.java:19)
at Hope.main(Hope.java:11)


-- --

Can we skip right to it?  What is the issue here?

Thanks.

Max R.