Custom Work Item Handler Error in jBPM maven project

[Vnay kndl]

Hi, I have created jbpm maven project where I dont want to use the default persistence feature and created a custom work item handler and configured it..

But I'm getting below error. 

Exception in thread "main" org.jbpm.workflow.instance.WorkflowRuntimeException: [com.sample.bpmn:1 - Task 1:3] -- Could not find work item handler for Human Task

at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:161)

at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerNodeInstance(NodeInstanceImpl.java:337)

at org.jbpm.workflow.instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java:296)

at org.jbpm.workflow.instance.node.StartNodeInstance.triggerCompleted(StartNodeInstance.java:66)

at org.jbpm.workflow.instance.node.StartNodeInstance.internalTrigger(StartNodeInstance.java:43)

at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:155)

at org.jbpm.ruleflow.instance.RuleFlowProcessInstance.internalStart(RuleFlowProcessInstance.java:35)

at org.jbpm.process.instance.impl.ProcessInstanceImpl.start(ProcessInstanceImpl.java:222)

at org.jbpm.workflow.instance.impl.WorkflowProcessInstanceImpl.start(WorkflowProcessInstanceImpl.java:358)

at org.jbpm.process.instance.ProcessRuntimeImpl.startProcessInstance(ProcessRuntimeImpl.java:189)

at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:171)

at org.jbpm.process.instance.ProcessRuntimeImpl.startProcess(ProcessRuntimeImpl.java:163)

at org.drools.core.common.AbstractWorkingMemory.startProcess(AbstractWorkingMemory.java:1576)

at org.drools.core.impl.StatefulKnowledgeSessionImpl.startProcess(StatefulKnowledgeSessionImpl.java:361)

at com.sample.ProcessMain.main(ProcessMain.java:41)

Caused by: org.drools.core.WorkItemHandlerNotFoundException: Could not find work item handler for Human Task

at org.drools.core.process.instance.impl.DefaultWorkItemManager.internalExecuteWorkItem(DefaultWorkItemManager.java:71)

at org.jbpm.workflow.instance.node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:124)

at org.jbpm.workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java:155)

My code:

               KieBase kbase = kContainer.getKieBase("kbase");

SimpleRegisterableItemsFactory factory = new SimpleRegisterableItemsFactory();

factory.addWorkItemHandler("CustomWorkItemHandler1", CustomWorkItemHandler1.class);

RuntimeEnvironmentBuilder builder = RuntimeEnvironmentBuilder.Factory.get().newEmptyBuilder()

         .persistence(false).knowledgeBase(kbase)

         .registerableItemsFactory(factory);

 

RuntimeManager mgr =  RuntimeManagerFactory.Factory.get()

         .newPerRequestRuntimeManager(builder.get(),

         "com.sample:example:1.0");

RuntimeEngine eng = mgr.getRuntimeEngine(EmptyContext.get());

KieSession ksess = eng.getKieSession();

// custom workitem class

public class CustomWorkItemHandler1 implements WorkItemHandler {

public void abortWorkItem(WorkItem wi, WorkItemManager wim) {

System.out.println("Custom Work Item Handler Abort Work Item Method.....! ");

}

public void executeWorkItem(WorkItem wi, WorkItemManager wim) {

System.out.println("Custom Work Item Handler Execute Work Item Method.....! ");

wim.completeWorkItem(wi.getId(), null);

}

}

//

kmodule.xml :

<kmodule xmlns="http://jboss.org/kie/6.0.0/kmodule">

  <kbase name="kbase" packages="com.sample">

  

  <ksession name="ksession"  default="true" clockType="realtime">

      <workItemHandlers>

        <workItemHandler type="com.sample.CustomWorkItemHandler1" name="CustomWorkItemHandler1" />

        

      </workItemHandlers>

      </ksession>

</kbase>

</kmodule>

//

And I have the task name as "CustomWorkItemHandler1" for the user task in the flow.

Could someone please help

Thanks!

[Maciej Swiderski]

This complains about missing work item handler for human task. Seems you have user task in your process so make sure you have handler for it registered as well

Maciej 

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[Vnay kndl]

Hi Maciej,

After I have registered handler.. I'm getting below error while i'm trying to retrieve getTasksAssignedAsPotentialOwner method..

Exception in thread "main" java.lang.NullPointerException

at org.jbpm.runtime.manager.impl.task.SynchronizedTaskService.getTasksAssignedAsPotentialOwner(SynchronizedTaskService.java:328)

Thanks!

[Vnay kndl]

Hi Maciej,

I'm getting taskservice as null from runtime engine....

KieServices ks = KieServices.Factory.get();

KieContainer kContainer = ks.getKieClasspathContainer();

KieBase kbase = kContainer.getKieBase("kbase");

SimpleRegisterableItemsFactory factory = new SimpleRegisterableItemsFactory();

    factory.addWorkItemHandler("Human Task", CustomWorkItemHandler1.class);

RuntimeEnvironmentBuilder builder = RuntimeEnvironmentBuilder.Factory.get()

.newEmptyBuilder().persistence(false).knowledgeBase(kbase).registerableItemsFactory(factory);

RuntimeManager manager = RuntimeManagerFactory.Factory.get()

.newPerRequestRuntimeManager(builder.get(), "com.sample:example:1.0");

RuntimeEngine engine = manager.getRuntimeEngine(null);

KieSession ksession = engine.getKieSession();

ksession.getWorkItemManager().registerWorkItemHandler("Human Task", new CustomWorkItemHandler1());

TaskService taskService = engine.getTaskService();

//  getting taskService null and because of that while invoking getTasksAssignedAsPotentialOwner ..getting the error that mentioned earlier..

Could you please look at this 

Thanks!

[Maciej Swiderski]

You can't run task service without persistence

Since you use custom handler for human task work item then task service from runtime engine is useless. 

Maciej 

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