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why I can't open the old java file on the run-time workbench? [message #200889]

Fri, 28 October 2005 06:00

Lichun zhang

Messages: 7
Registered: July 2009

Junior Member

When I tried to open the java files that I built before on the run-time
wokbench,the compiler found mistake:Unhandled event loop exception
Reason:
java.lang.NullPointerException
Unhandled event loop exception
Reason:
Failed to execute runnable
(java.lang.NullPointerException)
***SWT nested exeception
Reason:
java.lang.NullPoinerException
I can not find the reason.Why???

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Re: why I can't open the old java file on the run-time workbench? [message #200904 is a reply to message #200889]

Fri, 28 October 2005 08:45

Eclipse User

Originally posted by: ingo.koch[nospam].sap.com

Providing so less information, we can?t either :-)

"zlc" <257wheat@sohu.com> wrote in message
news:efe13e910e3d2487d0d12c9dd872a2e0$1@www.eclipse.org...
> When I tried to open the java files that I built before on the run-time
> wokbench,the compiler found mistake:Unhandled event loop exception
> Reason:
> java.lang.NullPointerException
> Unhandled event loop exception
> Reason:
> Failed to execute runnable
> (java.lang.NullPointerException)
> ***SWT nested exeception
> Reason:
> java.lang.NullPoinerException
> I can not find the reason.Why???
>

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Re: why I can't open the old java file on the run-time workbench? [message #201045 is a reply to message #200889]

Fri, 28 October 2005 18:36

Astrid Sawatzky

Messages: 62
Registered: July 2009

Member

zlc wrote:
> When I tried to open the java files that I built before on the run-time
> wokbench,the compiler found mistake:Unhandled event loop exception
> Reason:
> java.lang.NullPointerException
> Unhandled event loop exception
> Reason:
> Failed to execute runnable
> (java.lang.NullPointerException)
> ***SWT nested exeception
> Reason:
> java.lang.NullPoinerException
> I can not find the reason.Why???
>
try debugging.

you could set for example a breakpoint in your main class and then step
through until u see where the NPE is thrown.

regards
Astrid

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