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[CDO] NullPointerException [message #533177]

Wed, 12 May 2010 13:48

Greg Sutton

Messages: 2
Registered: July 2009

Junior Member

I get this error when multiple concurrent jobs attempt to lock the same object. The code completes successfully and there are no issues functionally apart from these messages.

Does anyone have any suggestions for how I might be able to fix this or even where to start looking?

[ERROR] NullPointerException
java.lang.NullPointerException
        at org.eclipse.emf.cdo.internal.common.protocol.CDODataInputImpl.readCDOBranch(CDODataInputImpl.java:170)
        at org.eclipse.emf.cdo.internal.common.protocol.CDODataInputImpl.readCDOCommitInfo(CDODataInputImpl.java:240)
        at org.eclipse.emf.cdo.internal.net4j.protocol.CommitNotificationIndication.indicating(CommitNotificationIndication.java:36)
        at org.eclipse.emf.cdo.internal.net4j.protocol.CDOClientIndication.indicating(CDOClientIndication.java:56)
        at org.eclipse.net4j.signal.Indication.doExtendedInput(Indication.java:55)
        at org.eclipse.net4j.signal.Signal.doInput(Signal.java:311)
        at org.eclipse.net4j.signal.Indication.execute(Indication.java:49)
        at org.eclipse.net4j.signal.Signal.runSync(Signal.java:238)
        at org.eclipse.net4j.signal.Signal.run(Signal.java:146)
        at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
        at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
        at java.lang.Thread.run(Thread.java:619)

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Re: [CDO] NullPointerException [message #533304 is a reply to message #533177]

Thu, 13 May 2010 06:43

Eike Stepper

Messages: 6682
Registered: July 2009

Senior Member

Hi Greg,

That's weird as it suggests that your local session has no branch
manager associated or the used CDODataInputImpl does not return it
properly. At least if your stack trace still matches CVS HEAD. Can you
try to set a breakpoint in CDODataInputImpl.readCDOBranch() and find out
what's going on there?

Note that a CommitNotificationIndication is sent asynchronously by the
server, so it can happen that the client session is in the process of
being deactivated at the same time. In this case all kinds of exceptions
can appear in the log that can be safely ignored. Please try to find out
if this is the situation in which you see this exception.

Cheers
/Eike

----
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Am 12.05.2010 15:48, schrieb Greg Sutton:
> I get this error when multiple concurrent jobs attempt to lock the
> same object. The code completes successfully and there are no issues
> functionally apart from these messages.
>
> Does anyone have any suggestions for how I might be able to fix this
> or even where to start looking?
>
>
> [ERROR] NullPointerException
> java.lang.NullPointerException
> at
> org.eclipse.emf.cdo.internal.common.protocol.CDODataInputImp l.readCDOBranch(CDODataInputImpl.java:170)
>
> at
> org.eclipse.emf.cdo.internal.common.protocol.CDODataInputImp l.readCDOCommitInfo(CDODataInputImpl.java:240)
>
> at
> org.eclipse.emf.cdo.internal.net4j.protocol.CommitNotificati onIndication.indicating(CommitNotificationIndication.java:36 )
>
> at
> org.eclipse.emf.cdo.internal.net4j.protocol.CDOClientIndicat ion.indicating(CDOClientIndication.java:56)
>
> at
> org.eclipse.net4j.signal.Indication.doExtendedInput(Indicati on.java:55)
> at org.eclipse.net4j.signal.Signal.doInput(Signal.java:311)
> at org.eclipse.net4j.signal.Indication.execute(Indication.java: 49)
> at org.eclipse.net4j.signal.Signal.runSync(Signal.java:238)
> at org.eclipse.net4j.signal.Signal.run(Signal.java:146)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Threa dPoolExecutor.java:886)
>
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoo lExecutor.java:908)
>
> at java.lang.Thread.run(Thread.java:619)
>

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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Re: [CDO] NullPointerException [message #533409 is a reply to message #533304]

Thu, 13 May 2010 17:55

Greg Sutton

Messages: 2
Registered: July 2009

Junior Member

Eike,

ok, that makes sense now. It appears this only happens when my processes are closing down.

I'd really rather not have ignored exceptions, but I can filter them out if I know they are expected.

Thanks for the quick response.

Regards, Greg.

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Re: [CDO] NullPointerException [message #533411 is a reply to message #533409]

Thu, 13 May 2010 18:08

Eike Stepper

Messages: 6682
Registered: July 2009

Senior Member

Hi Greg,

When we have time we can try to reduce the number of log entries for
unimportant exceptions like this one. Please file an enhancement request.

Cheers
/Eike

----
http://thegordian.blogspot.com
http://twitter.com/eikestepper

Am 13.05.2010 19:55, schrieb Greg Sutton:
>
> Eike,
>
> ok, that makes sense now. It appears this only happens when my
> processes are closing down.
>
> I'd really rather not have ignored exceptions, but I can filter them
> out if I know they are expected.
>
> Thanks for the quick response.
>
> Regards, Greg.

Cheers
/Eike

----
http://www.esc-net.de
http://thegordian.blogspot.com
http://twitter.com/eikestepper

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