[mod_cluster-dev] nullpointer exception while updating cluster status

[Marek Goldmann]

On Jul 28, 2009, at 5:40 PM, Paul Ferraro wrote:

> This looks like the result of a partition merge.  The merging of 2
> partitions creates a situation where a former singleton master might  
> be
> in the middle of rpcs on the new singleton master, whose responses are
> being handled correctly.  JIRA filed here:
> https://jira.jboss.org/jira/browse/MODCLUSTER-85

Yes, it was thrown after I started/shutdown several instances on EC2.  
Thank you for filling a ticket!

>
> I presume that this stream of NPEs only occurs for a brief period.  Is
> that correct?

As you see in logs NPE is thrown periodically with 10 sec pause. I  
waited about 3 min and the NPE was still thrown, after that I shutdown  
that instance. Unfortunately I don't know if that NPE was thrown only  
for a short period of time :(

--Marek

>
> On Mon, 2009-07-27 at 21:27 +0200, Marek Goldmann wrote:
>> Hi,
>>
>> I got today a NullPointerException:
>>
>> java.lang.NullPointerException at
>> org.jboss.modcluster.ha.HAModClusterService
>> $
>> ClusteredCatalinaEventHandler
>> .updateClusterStatus(HAModClusterService.java:896) at
>> org.jboss.modcluster.ha.HAModClusterService
>> $ClusteredCatalinaEventHandler.status(HAModClusterService.java:836)  
>> at
>> org.jboss.modcluster.ha.HAModClusterService
>> $ClusteredCatalinaEventHandler.status(HAModClusterService.java:781)  
>> at
>> org
>> .jboss
>> .modcluster
>> .CatalinaEventHandlerAdapter
>> .lifecycleEvent(CatalinaEventHandlerAdapter.java:157) at
>> org
>> .apache
>> .catalina
>> .util.LifecycleSupport.fireLifecycleEvent(LifecycleSupport.java:117)
>> at
>> org
>> .apache
>> .catalina.core.ContainerBase.backgroundProcess(ContainerBase.java:
>> 1348) at org.apache.catalina.core.ContainerBase
>> $ContainerBackgroundProcessor.processChildren(ContainerBase.java: 
>> 1612)
>> at org.apache.catalina.core.ContainerBase
>> $ContainerBackgroundProcessor.run(ContainerBase.java:1601) at
>> java.lang.Thread.run(Thread.java:636)
>>
>> JBoss AS log is here: http://pastie.org/560597
>>
>> What could be the reason for that? I'm using mod_cluster 1.0.0.GA.
>>
>
>

-- 
Marek Goldmann

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