Question

My code is as follows:

public class BoxingUnboxingExample {
    public static void main(String[] args) {
        Integer i1 = null;
        Integer i3 = 10;
        BoxingUnboxingExample b = new BoxingUnboxingExample();
        b.go(i3);
        b.go(i1);
    }
    private void go(int a){
        System.out.println("a");
    }
}

Now my question is:

Sometimes I get the following error message,

Exception in thread "main" java.lang.NullPointerException
at scjp.wraperExample.BoxingUnboxingExample.main(BoxingUnboxingExample.java:12)
a

Whereas, I think It should always be the following,

a
Exception in thread "main" java.lang.NullPointerException
at scjp.wraperExample.BoxingUnboxingExample.main(BoxingUnboxingExample.java:12)

Am I correct?

Answer 1

If you are in Eclipse, this is a known problem, see https://bugs.eclipse.org/bugs/show_bug.cgi?id=32205