NullPointerException when call the get(..) method, Who c

[liuhang781102]

I have two tree caches in the cluster.

Fllowing is the exception stacktrace . The last row has no more stacks, so it is versy strange. Who can help me ?


java.lang.RuntimeException: java.lang.NullPointerException
at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:5523)
at org.jboss.cache.TreeCache.get(TreeCache.java:3468)
at org.jboss.cache.TreeCache.get(TreeCache.java:3449)
at com.primeton.eos.wf.service.instpool.treecache.optimize.WFInstancePoolOptimize.findProcessInstanceByID(WFInstancePoolOptimize.java:293)
at com.primeton.eos.wf.service.instpool.treecache.optimize.WFInstancePoolOptimize.findProcessInstanceByID(WFInstancePoolOptimize.java:421)
at com.primeton.eos.wf.service.api.systemlog.InstPoolSync.syncInner(InstPoolSync.java:100)
at com.primeton.eos.wf.service.api.systemlog.InstPoolSync.sync(InstPoolSync.java:96)
at com.primeton.eos.wf.service.api.systemlog.InstPoolSync.syncByWorkItemID(InstPoolSync.java:85)
at com.primeton.eos.wf.engine.worklist.WorklistQueryManagerImpl.queryWorkItemByID(WorklistQueryManagerImpl.java:1079)
at com.primeton.eos.wf.engxml.EngineXMLAdaptor.queryWorkItemByID(EngineXMLAdaptor.java:1662)
at com.primeton.eos.wf.bizlet.WorklistQueryManager.BL_queryWorkItemByID(Unknown Source)
... 32 more
Caused by: java.lang.NullPointerException

[liuhang781102]

Forget to tell you , the version is 1.4.0.

[liuhang781102]

The exception only occured in concurrent invocations.

[mircea.markus]

Is this the first things that happens imediatelly after starting the cache? Logs indicated that interceptor stack is null, which is strange indeed. I also suggest upgrading to 1.4.0.SP1

[liuhang781102]

This is not the first things happened immediatelly after the cache start.

I modified my code ,now I get the fllowing exception stack. It is more clearly.
NullpointerException throws in the wasRemovedInTx method of CacheLoaderInterceptor class.
It seams that the 'entry' is null.
I also paste the function code.
Still need your help!

Exception Stack:
-----------------------------------------------------------
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at com.primeton.eos.fbframe.fbrole.security.filter.WebSecurityFilter.doFilter(WebSecurityFilter.java:101)
at weblogic.servlet.internal.FilterChainImpl.doFilter(FilterChainImpl.java:27)
at weblogic.servlet.internal.WebAppServletContext$ServletInvocationAction.run(WebAppServletContext.java:6724)
at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
at weblogic.security.service.SecurityManager.runAs(SecurityManager.java:121)
at weblogic.servlet.internal.WebAppServletContext.invokeServlet(WebAppServletContext.java:3764)
at weblogic.servlet.internal.ServletRequestImpl.execute(ServletRequestImpl.java:2644)
at weblogic.kernel.ExecuteThread.execute(ExecuteThread.java:219)
at weblogic.kernel.ExecuteThread.run(ExecuteThread.java:178)
Caused by: java.lang.NullPointerException
at org.jboss.cache.interceptors.CacheLoaderInterceptor.wasRemovedInTx(CacheLoaderInterceptor.java:307)
at org.jboss.cache.interceptors.CacheLoaderInterceptor.invoke(CacheLoaderInterceptor.java:164)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at org.jboss.cache.interceptors.UnlockInterceptor.invoke(UnlockInterceptor.java:32)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at org.jboss.cache.interceptors.InvalidationInterceptor.invoke(InvalidationInterceptor.java:60)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at org.jboss.cache.interceptors.TxInterceptor.handleNonTxMethod(TxInterceptor.java:345)
at org.jboss.cache.interceptors.TxInterceptor.invoke(TxInterceptor.java:156)
at org.jboss.cache.interceptors.Interceptor.invoke(Interceptor.java:68)
at org.jboss.cache.interceptors.CacheMgmtInterceptor.invoke(CacheMgmtInterceptor.java:138)
at org.jboss.cache.TreeCache.invokeMethod(TreeCache.java:5517)
... 44 more


The Excepton Code in jbosscache
-------------------------------------------------------------
private boolean wasRemovedInTx(Fqn fqn)
{
GlobalTransaction t = getInvocationContext().getGlobalTransaction();
if (t == null)
return false;
TransactionEntry entry = txTable.get(t);
Iterator i = entry.getCacheLoaderModifications().iterator(); ( ------------------ row 307----)
while (i.hasNext())
{
JBCMethodCall m = (JBCMethodCall)i.next();
if (m.getMethodId() == MethodDeclarations.removeNodeMethodLocal_id
&& fqn.isChildOrEquals((Fqn)m.getArgs()[1]))
return true;
}
return false;
}

[liuhang781102]

I suppose there is some relation to tx. This get method is not in tx . I also have many 'get' calls in tx,they runs correctly! But why 'get' calls must in tx envirement?

[mircea.markus]

This looks very much like a bug. I've tried some scenarios to reproduce it, but couldn't. Can you please post your configuration, and also some code to describe the cache access pattern in which the failure occurs (tx is started? am I doing a get on a non existent node?) A unit test to reproduce the issue would be great!
Thanks, mircea

[liuhang781102]

Thanks for attention!

I've post my config in another post:http://jboss.org/index.html?module=bb&op=viewtopic&t=130898

Now I have another fatal problem ,and I am working with it.

If i have time later, i'll have you to reproduce it.
Thank you !