Name: nt126004 Date: 02/01/2002


FULL PRODUCT VERSION :
java version "1.4.0-beta3"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-beta3-b84)
Java HotSpot(TM) Client VM (build 1.4.0-beta3-b84, mixed mode)

FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Version 5.00.2195]



A DESCRIPTION OF THE PROBLEM :
If you extend a Reference class such as WeakReference and
override the clear/enqueue methods, the overridden methods
are never called even if the Garbage Collector actually
enqueues/clears the references. If this is the desired
behaviour, it may be advisable to declare these methods as
final in the Reference classes.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1.Run the given program.

This bug can be reproduced always.

---------- BEGIN SOURCE ----------
package com.daffodilwoods.codare.testcases;

import java.lang.ref.*;

public class TCWeakReferenceEnqueue {

    public TCWeakReferenceEnqueue() {
    }

    public static void main(String[] args) {
        try{
Integer integer = new Integer(1);
        ExtendedWeakReference weakReference = new ExtendedWeakReference
(integer);
integer = null;
        System.out.println("Before Garbage Collected : " + weakReference.get
());
        System.gc();
        System.out.println("After Garbage Collected : " + weakReference.get
());
        Thread.sleep(5000);
        System.out.println("After Thread Execution : " + weakReference.get
());
        }
catch(Exception E){
E.printStackTrace();
}
    }
}

class ExtendedWeakReference extends WeakReference {
public ExtendedWeakReference(Object k) {
super(k);
}

public ExtendedWeakReference(Object k, ReferenceQueue q) {
super(k, q);
}

public void clear(){
System.out.println("Clear called");
super.clear();
}
public boolean enqueue(){
System.out.println("Enqueue called");
return super.enqueue();
}
    }
}

---------- END SOURCE ----------
(Review ID: 138225)
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