Feki Ahmed [https://community.jboss.org/people/bardelman] created the discussion "jbpm 5.4.0 - NullPointerException completing workItem. is this bug not resolved yet ?" To view the discussion, visit: https://community.jboss.org/message/799849#799849 -------------------------------------------------------------- i think that i have the same issue then in https://community.jboss.org/message/790056#790056 here which seems to be a bug in jbpm 5.4. i had the same exception when trying to complete a workitem after a session reload, By the way, i coudn't get a processInstance using  :processInstance = ksession.getProcessInstance(processInstance.getId()); from the reloaded Session, i also wish to know why. even the ksession.getProcessInstances() is empty !) i have to mention that the task status is "completed" in the database even when this exception happens but the process do not continue to the next task. this is the log for it the exception: (SingleSessionCommandService.java:400) ERROR org.drools.persistence.SingleSessionCommandService - Could not commit session java.lang.NullPointerException           at org.jbpm.process.instance.impl.ProcessInstanceImpl.setProcess(ProcessInstanceImpl.java:62)           at org.jbpm.marshalling.impl.AbstractProtobufProcessInstanceMarshaller.readProcessInstance(AbstractProtobufProcessInstanceMarshaller.java:375)           at org.jbpm.persistence.processinstance.ProcessInstanceInfo.getProcessInstance(ProcessInstanceInfo.java:142)           at org.jbpm.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:91)           at org.jbpm.process.instance.ProcessRuntimeImpl.getProcessInstance(ProcessRuntimeImpl.java:206)           at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1116)           at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:297)           at org.drools.persistence.jpa.processinstance.JPAWorkItemManager.completeWorkItem(JPAWorkItemManager.java:117)           at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:69)           at org.drools.command.runtime.process.CompleteWorkItemCommand.execute(CompleteWorkItemCommand.java:32)           at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36)           at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:373)           at org.drools.command.impl.CommandBasedStatefulKnowledgeSession$1.completeWorkItem(CommandBasedStatefulKnowledgeSession.java:150)           at ManagedBeans.JbpmAPIUtil.StartAndCompleteTask(JbpmAPIUtil.java:372)           at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)           at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)           at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)           at java.lang.reflect.Method.invoke(Unknown Source)           at org.apache.el.parser.AstValue.invoke(AstValue.java:264)           at org.apache.el.MethodExpressionImpl.invoke(MethodExpressionImpl.java:278)           at com.sun.faces.facelets.el.TagMethodExpression.invoke(TagMethodExpression.java:105)           at com.sun.faces.facelets.tag.jsf.core.AjaxBehaviorListenerImpl.processAjaxBehavior(AjaxHandler.java:450)           at javax.faces.event.AjaxBehaviorEvent.processListener(AjaxBehaviorEvent.java:113)           at javax.faces.component.behavior.BehaviorBase.broadcast(BehaviorBase.java:106)           at javax.faces.component.UIComponentBase.broadcast(UIComponentBase.java:760)           at javax.faces.component.UICommand.broadcast(UICommand.java:300)           at javax.faces.component.UIViewRoot.broadcastEvents(UIViewRoot.java:794)           at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:1259)           at com.sun.faces.lifecycle.InvokeApplicationPhase.execute(InvokeApplicationPhase.java:81)           at com.sun.faces.lifecycle.Phase.doPhase(Phase.java:101)           at com.sun.faces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:118)           at javax.faces.webapp.FacesServlet.service(FacesServlet.java:593)           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:305)           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)           at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:225)           at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:123)           at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:472)           at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:168)           at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:98)           at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:927)           at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:118)           at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:407)           at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1001)           at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:585)           at org.apache.tomcat.util.net.AprEndpoint$SocketProcessor.run(AprEndpoint.java:1770)           at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)           at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)           at java.lang.Thread.run(Unknown Source) Thanks for help !!! -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/799849#799849] Start a new discussion in jBPM Development at Community 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