I catch the following error, but I don't have any idea the reason this happen:

javax.transaction.TransactionRolledbackException: null; CausedByException is:
        null; nested exception is: 
        javax.ejb.EJBException: null; CausedByException is:
        null
        at 
org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:244)
        at 
org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:335)
        at 
org.jboss.ejb.plugins.TxInterceptorCMT.invokeHome(TxInterceptorCMT.java:146)
        at 
org.jboss.ejb.plugins.SecurityInterceptor.invokeHome(SecurityInterceptor.java:116)
        at 
org.jboss.ejb.plugins.LogInterceptor.invokeHome(LogInterceptor.java:121)
        at 
org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invokeHome(ProxyFactoryFinderInterceptor.java:93)
        at 
org.jboss.ejb.EntityContainer.internalInvokeHome(EntityContainer.java:508)
        at org.jboss.ejb.Container.invoke(Container.java:894)
        at sun.reflect.GeneratedMethodAccessor69.invoke(Unknown Source)
        at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
        at java.lang.reflect.Method.invoke(Method.java:324)
        at 
org.jboss.mx.interceptor.ReflectedDispatcher.invoke(ReflectedDispatcher.java:141)
        at org.jboss.mx.server.Invocation.dispatch(Invocation.java:80)
        at org.jboss.mx.server.Invocation.invoke(Invocation.java:72)
        at 
org.jboss.mx.server.AbstractMBeanInvoker.invoke(AbstractMBeanInvoker.java:249)
        at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:644)
        at 
org.jboss.invocation.local.LocalInvoker$MBeanServerAction.invoke(LocalInvoker.java:155)
        at org.jboss.invocation.local.LocalInvoker.invoke(LocalInvoker.java:104)
        at 
org.jboss.invocation.InvokerInterceptor.invokeLocal(InvokerInterceptor.java:179)
        at 
org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:165)
        at 
org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:46)
        at 
org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:55)
        at org.jboss.proxy.ejb.HomeInterceptor.invoke(HomeInterceptor.java:169)
        at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:86)
        at $Proxy1185.findByUID(Unknown Source)
        at 
com.neogrid.arch.workflow.cmd.WFEngineImpl.getProcess(WFEngineImpl.java:118)


Somebody knows what is the problem??

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