Unable to create a human task (jbpm Process)

[d.synchronized]

Hi Fellas,

I was trying tto configure a human task in my project and was unable to register one below i am posting he error log i was getting

6:52:49,491 ERROR [org.jbpm.services.task.wih.LocalHTWorkItemHandler] (http-localhost/127.0.0.1:8080-1) Mon Nov 18 16:52:49 GMT 2013: Error when creating task on task server for work item id 1. Error reported by task server: null: java.lang.NullPointerException

  at org.jbpm.services.task.wih.LocalHTWorkItemHandler.executeWorkItem(LocalHTWorkItemHandler.java:65) [jbpm-human-task-workitems-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.drools.core.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:70) [drools-core-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:119) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:152) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:335) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:294) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:66) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:43) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:152) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:220) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:355) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:189) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:171) [jbpm-flow-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.drools.core.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1039) [drools-core-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.drools.core.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:334) [drools-core-6.0.0.Beta4.jar:6.0.0.Beta4]

  at org.switchyard.component.bpm.exchange.BPMExchangeHandler.handleOperation(BPMExchangeHandler.java:205) [switchyard-component-bpm-1.0.0.Final.jar:1.0.0.Final]

  at org.switchyard.component.common.knowledge.exchange.KnowledgeExchangeHandler.handleMessage(KnowledgeExchangeHandler.java:239)

  at org.switchyard.bus.camel.processors.ProviderProcessor.process(ProviderProcessor.java:28) [switchyard-bus-camel-1.0.0.Final.jar:1.0.0.Final]

  at org.apache.camel.util.AsyncProcessorConverterHelper$ProcessorToAsyncProcessorBridge.process(AsyncProcessorConverterHelper.java:61) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:91) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.switchyard.bus.camel.audit.FaultProcessor.process(FaultProcessor.java:44) [switchyard-bus-camel-1.0.0.Final.jar:1.0.0.Final]

  at org.apache.camel.processor.RouteContextProcessor.processNext(RouteContextProcessor.java:45) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.interceptor.DefaultChannel.process(DefaultChannel.java:303) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.Pipeline.process(Pipeline.java:117) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.Pipeline.process(Pipeline.java:80) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.TryProcessor.process(TryProcessor.java:104) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.TryProcessor.process(TryProcessor.java:78) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.interceptor.TraceInterceptor.process(TraceInterceptor.java:91) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.switchyard.bus.camel.audit.FaultProcessor.process(FaultProcessor.java:44) [switchyard-bus-camel-1.0.0.Final.jar:1.0.0.Final]

  at org.apache.camel.processor.RouteContextProcessor.processNext(RouteContextProcessor.java:45) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.interceptor.DefaultChannel.process(DefaultChannel.java:303) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.RouteContextProcessor.processNext(RouteContextProcessor.java:45) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:122) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.RouteInflightRepositoryProcessor.processNext(RouteInflightRepositoryProcessor.java:48) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.processNext(DelegateAsyncProcessor.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:90) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.management.InstrumentationProcessor.process(InstrumentationProcessor.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:73) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.component.direct.DirectProducer.process(DirectProducer.java:61) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.UnitOfWorkProcessor.processAsync(UnitOfWorkProcessor.java:150) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.UnitOfWorkProcessor.process(UnitOfWorkProcessor.java:117) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.util.AsyncProcessorHelper.process(AsyncProcessorHelper.java:99) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.DelegateAsyncProcessor.process(DelegateAsyncProcessor.java:86) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.processor.UnitOfWorkProducer.process(UnitOfWorkProducer.java:63) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:360) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.impl.ProducerCache$2.doInProducer(ProducerCache.java:331) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.impl.ProducerCache.doInProducer(ProducerCache.java:227) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.impl.ProducerCache.sendExchange(ProducerCache.java:331) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.impl.ProducerCache.send(ProducerCache.java:153) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:106) [camel-core-2.10.0.jar:2.10.0]

  at org.apache.camel.impl.DefaultProducerTemplate.send(DefaultProducerTemplate.java:92) [camel-core-2.10.0.jar:2.10.0]

  at org.switchyard.bus.camel.ExchangeDispatcher.dispatch(ExchangeDispatcher.java:87) [switchyard-bus-camel-1.0.0.Final.jar:1.0.0.Final]

  at org.switchyard.bus.camel.CamelExchange.sendInternal(CamelExchange.java:224) [switchyard-bus-camel-1.0.0.Final.jar:1.0.0.Final]

  at org.switchyard.bus.camel.CamelExchange.send(CamelExchange.java:174) [switchyard-bus-camel-1.0.0.Final.jar:1.0.0.Final]

  at org.switchyard.component.resteasy.InboundHandler.invoke(InboundHandler.java:116) [switchyard-component-resteasy-1.0.0.Final.jar:1.0.0.Final]

  at org.switchyard.component.resteasy.util.RESTEasyProxy.invoke(RESTEasyProxy.java:96) [switchyard-component-resteasy-1.0.0.Final.jar:1.0.0.Final]

  at com.sun.proxy.$Proxy43.referenceTenant(Unknown Source)

  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) [rt.jar:1.6.0_43]

  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) [rt.jar:1.6.0_43]

  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) [rt.jar:1.6.0_43]

  at java.lang.reflect.Method.invoke(Method.java:597) [rt.jar:1.6.0_43]

  at org.jboss.resteasy.core.MethodInjectorImpl.invoke(MethodInjectorImpl.java:167) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.core.ResourceMethod.invokeOnTarget(ResourceMethod.java:257) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:222) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.core.ResourceMethod.invoke(ResourceMethod.java:211) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.core.SynchronousDispatcher.getResponse(SynchronousDispatcher.java:542) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:524) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.core.SynchronousDispatcher.invoke(SynchronousDispatcher.java:126) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.plugins.server.servlet.ServletContainerDispatcher.service(ServletContainerDispatcher.java:208) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:55) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at org.jboss.resteasy.plugins.server.servlet.HttpServletDispatcher.service(HttpServletDispatcher.java:50) [resteasy-jaxrs-2.3.5.Final-redhat-1.jar:2.3.5.Final-redhat-1]

  at javax.servlet.http.HttpServlet.service(HttpServlet.java:847) [jboss-servlet-api_3.0_spec-1.0.2.Final-redhat-1.jar:1.0.2.Final-redhat-1]

  at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:295) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:230) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:149) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:145) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:97) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:102) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:336) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:653) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:920) [jbossweb-7.2.0.Final-redhat-1.jar:7.2.0.Final-redhat-1]

  at java.lang.Thread.run(Thread.java:662) [rt.jar:1.6.0_43]

I am also posting my sy.xml,and the bpmn along with this.

[dward]

Hmmm.... Nothing is jumping out at me as being wrong in the bpmn or switchyard files.  By the looks of things, can I assume you're using SwitchYard 1.0.0.Final as the runtime?  Also, what version of the tooling are you using (bpmn editor and switchyard editor)?  Last, do you happen to have a full application that you can attach that demonstrates this?  Thanks.

[kcbabo]

Please post your questions in the users forums instead of the developer forum.  For more information, see this featured post on the top of the developer forum space:

Before You Post to SwitchYard Development

thanks,

keith

[d.synchronized]

@David:-While i was debugging the code for the human task,i found in the class LocalHTWorkItemHandler,The following line of code

runtime.getTaskService() returning null and then it tries to add the task into the null service which results in a null pointer exception

under the method executeWorkItem,

Do i need to start task server somewhere?..

Moreover in posting the application here size is a parameter (;being more then 48 Mb) owing to which i can't post it here

Apart from this ,I am not persisting the process anywhere,i.e not using any persistince thing like we used in helpdesk for persisting the long running human task into an in memory database

Thanks for your early reply

d.synchronized

[kcbabo]

48MB is a super huge app.  Is this a WAR or a JAR deployment?  What's making it so large?  The reason I ask is that a common issue we see is when WAR deployment is used and all of the SY dependencies are included in the deployed app.  As you can imagine, this creates problems at runtime.

[d.synchronized]

yes it is a war deployment,

Now i am attaching the war file here Hope you can figure out the problem using it,

To hit the rest interface/and create a human task on this project the code is present in ReferenceTesting.java and you can access the web console at

http://localhost:8080/HomeletConnect/Referencing.jsf

[d.synchronized]

Earlier i was not persisting the process and now the error is gone ,

Drools documentation says we got two ways of doing this either using JPA or Spring,Currently i am using JPA to persist the process,So now the error is gone .

Thanks for your help

d.synchronized

[dward]

You shouldn't have to enable persistence for adding human tasks.  I have not had a chance to debug your application, but am still planning on it.  This could very well be a bug.

[dward]

For what it's worth, I saw a bug when upgrading to jBPM 6.0.1.Final where this NPE could occur when not enabling persistence.  However: 1) I have not seen it before 6.0.1.Final , 2) I've fixed it for SwitchYard 2.0 as part of jira SWITCHYARD-1935 .