FULL PRODUCT VERSION :
java version "1.5.0"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0-b64)
Java HotSpot(TM) Client VM (build 1.5.0-b64, mixed mode, sharing)

ADDITIONAL OS VERSION INFORMATION :
windows XP sp1

A DESCRIPTION OF THE PROBLEM :
public class TaskPool {
    public static void main( String[] args ) throws InterruptedException {
        LinkedBlockingQueue lbq = new LinkedBlockingQueue();
        Integer one = 1;
        Integer two = 2;
        Integer three = 3;
        lbq.put(one);
        lbq.put(two);
        lbq.remove(one);
        lbq.remove(two);
        lbq.put(three);
        System.out.println(lbq.take());
    }
}

java TaskPool

Exception in thread "main" java.lang.NullPointerException

    at java.util.concurrent.LinkedBlockingQueue.extract(Unknown Source)
    at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
    at TaskPool.main(TaskPool.java:23)

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
java TaskPool

ACTUAL -
Exception in thread "main" java.lang.NullPointerException

    at java.util.concurrent.LinkedBlockingQueue.extract(Unknown Source)
    at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
    at TaskPool.main(TaskPool.java:23)

ERROR MESSAGES/STACK TRACES THAT OCCUR :
Exception in thread "main" java.lang.NullPointerException

    at java.util.concurrent.LinkedBlockingQueue.extract(Unknown Source)
    at java.util.concurrent.LinkedBlockingQueue.take(Unknown Source)
    at TaskPool.main(TaskPool.java:23)

REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------
import java.util.concurrent.LinkedBlockingQueue;

public class TaskPool {
    public static void main( String[] args ) throws InterruptedException {
        LinkedBlockingQueue lbq = new LinkedBlockingQueue();
        Integer one = 1;
        Integer two = 2;
        Integer three = 3;
        lbq.put(one);
        lbq.put(two);
        lbq.remove(one);
        lbq.remove(two);
        lbq.put(three);
        System.out.println(lbq.take());
    }
}
---------- END SOURCE ----------
###@###.### 2005-1-10 12:08:56 GMT