hiro.y [https://community.jboss.org/people/hiro.y] created the discussion "java.lang.NullPointerException when you try to getProcessInstance of bad instance." To view the discussion, visit: https://community.jboss.org/message/747659#747659 -------------------------------------------------------------- I found good way of trouble shooting. If you try to getProcessInstance and get java.lang.NullPointerException, Try to check your DB manually. 1.Start h2 manually   ${install.home} > java -cp db\driver\h2.jar org.h2.tools.Server 2.Connect to your db from browser ( http://172.22.14.186:8082/ http://172.22.14.186:8082/)   driver class :org.h2.Driver JDBC URL : jdbc:h2:tcp://localhost/runtime/jbpm 3.Select processinstanceinfo   SELECT * FROM PROCESSINSTANCEINFO https://community.jboss.org/servlet/JiveServlet/showImage/2-747659-18999/... https://community.jboss.org/servlet/JiveServlet/downloadImage/2-747659-18... 4.And search bad processinstance which contains null in dataset. When I got error like below, this solved the problem. Hope this help you. ------------------------------------------------ 2012/07/10 15:08:13,697 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[default-host].[/gwt-console-server].[Resteasy]] (http--0.0.0.0-8080-5) サーブレット Resteasy のServlet.service()が例外を投げました: org.jboss.resteasy.spi.UnhandledException: java.lang.NullPointerException           at org.jboss.resteasy.core.SynchronousDispatcher.unwrapException(SynchronousDispatcher.java:345) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.SynchronousDispatcher.handleApplicationException(SynchronousDispatcher.java:321) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.SynchronousDispatcher.handleException(SynchronousDispatcher.java:214) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.SynchronousDispatcher.handleInvokerException(SynchronousDispatcher.java:190) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:534) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:496) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:119) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.2.1.GA.jar:]           at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.0.Final.jar:1.0.0.Final]           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:329) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.jboss.bpm.console.server.util.GWTJsonFilter.doFilter(GWTJsonFilter.java:59) [classes:]           at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:280) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:248) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:275) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:161) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.jboss.as.web.security.SecurityContextAssociationValve.invoke(SecurityContextAssociationValve.java:139) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]           at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:480) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.jboss.as.web.NamingValve.invoke(NamingValve.java:57) [jboss-as-web-7.0.2.Final.jar:7.0.2.Final]           at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:154) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:362) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:877) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:667) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:952) [jbossweb-7.0.1.Final.jar:7.0.2.Final]           at java.lang.Thread.run(Thread.java:619) [:1.6.0_21] Caused by: java.lang.NullPointerException           at java.io.ByteArrayInputStream.<init>(ByteArrayInputStream.java:89) [:1.6.0_21]           at org.jbpm.persistence.processinstance.ProcessInstanceInfo.getProcessInstance(ProcessInstanceInfo.java:132) [jbpm-persistence-jpa-5.3.0.Final.jar:]           at org.jbpm.persistence.processinstance.JPAProcessInstanceManager.getProcessInstance(JPAProcessInstanceManager.java:83) [jbpm-persistence-jpa-5.3.0.Final.jar:]           at org.jbpm.process.instance.ProcessRuntimeImpl.getProcessInstance(ProcessRuntimeImpl.java:204) [jbpm-flow-5.3.0.Final.jar:]           at org.drools.common.AbstractWorkingMemory.getProcessInstance(AbstractWorkingMemory.java:1100) [drools-core-5.4.0.Final.jar:]           at org.drools.impl.StatefulKnowledgeSessionImpl.getProcessInstance(StatefulKnowledgeSessionImpl.java:297) [drools-core-5.4.0.Final.jar:]           at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:48) [drools-core-5.4.0.Final.jar:]           at org.drools.command.runtime.process.GetProcessInstanceCommand.execute(GetProcessInstanceCommand.java:25) [drools-core-5.4.0.Final.jar:]           at org.drools.command.impl.DefaultCommandService.execute(DefaultCommandService.java:36) [drools-core-5.4.0.Final.jar:]           at org.drools.persistence.SingleSessionCommandService.execute(SingleSessionCommandService.java:367) [drools-persistence-jpa-5.4.0.Final.jar:]           at org.drools.command.impl.CommandBasedStatefulKnowledgeSession.getProcessInstance(CommandBasedStatefulKnowledgeSession.java:125) [drools-core-5.4.0.Final.jar:]           at org.jbpm.integration.console.CommandDelegate.getActiveNodeInstances(CommandDelegate.java:211) [jbpm-gwt-core-5.3.0.Final.jar:]           at org.jbpm.integration.console.ProcessManagement.getProcessInstances(ProcessManagement.java:75) [jbpm-gwt-core-5.3.0.Final.jar:]           at org.jboss.bpm.console.server.ProcessMgmtFacade.getInstancesJSON(ProcessMgmtFacade.java:192) [classes:]           at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [:1.6.0_21]           at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [:1.6.0_21]           at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [:1.6.0_21]           at java.lang.reflect.Method.invoke(Method.java:597) [:1.6.0_21]           at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:140) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:255) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:220) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:209) [resteasy-jaxrs-2.2.1.GA.jar:]           at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:519) [resteasy-jaxrs-2.2.1.GA.jar:]           ... 24 more -------------------------------------------------------------- Reply to this message by going to Community [https://community.jboss.org/message/747659#747659] Start a new discussion in jBPM at Community [https://community.jboss.org/choose-container!input.jspa?contentType=1&...]