Name: dk106046 Date: 07/13/2004

Compile and run the following program.
The setPriority method call will raise a NullPointerException.

public class Npe extends java.lang.Thread {

    public void run(){
        try{
            Thread.sleep(500);
        }catch(java.lang.InterruptedException e){}
    }

    public static void main(String[] args){
        Npe npe = new Npe();

        npe.start();
        try{
            npe.join();
        }catch(java.lang.InterruptedException e){}

        npe.setPriority(java.lang.Thread.MIN_PRIORITY);
    }

}

The error message:

Exception in thread "main" java.lang.NullPointerException
    at java.lang.Thread.setPriority(Thread.java:875)
    at Npe.main(Npe.java:18)

obviously the line number in Thread.java will vary by build

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