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

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

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. >