You're not pasting the real code, I don't think. I suspect you're just getting
screwed by autoboxing in whatever code you're not showing. If you have:
Boolean a = null;
boolean b = a;
That will result in a NPE as auto-unboxing attempts to unbox a into a boolean,
which throws a NPE. Somewhere in the code you didn't include is an unbox into a
boolean (little b) of your null Boolean.
So, for instance:
Boolean a = null;
if (a) {
}
will NPE. Look more closely at the exact code, specifically the line of code
that actually failing, and make sure you're not getting an unbox.
ms
On Nov 21, 2009, at 10:23 AM, Shravan Kumar. M wrote:
> Hello Group,
>
> Boolean a = null;
> if(a != null)
> System.out.println("s");
> else
> System.out.println("n");
>
> ----------
> Above code block raises NullPointerException, where as below one runs
> successfully!!! Same is the case with any wrapper class (Integer, Long, ...).
> *Its wondering what it makes difference in checking (a != null) and (a ==
> null)? Its just an Object check rt!*
>
> Exact exception: java.lang.NullPointerException at booleanValue()
> ----------
>
> Boolean a = null;
> if(a == null)
> System.out.println("s");
> else
> System.out.println("n");
>
> Thank You,
> Shravan Kumar. M
> --------------------------------
>
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