[jboss-user] [jBPM] - Re: java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper

kifayath khan do-not-reply at jboss.com
Fri Aug 31 10:31:16 EDT 2012


kifayath khan [https://community.jboss.org/people/kifayath] created the discussion

"Re: java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper"

To view the discussion, visit: https://community.jboss.org/message/757289#757289

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I am also getting same error , i am putting my code and error. Please help me


> package com.sample;
> 
> 
> import java.util.HashMap;
> import java.util.Map;
> 
> 
> import org.drools.KnowledgeBase;
> import org.drools.builder.KnowledgeBuilder;
> import org.drools.builder.KnowledgeBuilderFactory;
> import org.drools.builder.ResourceType;
> import org.drools.io.ResourceFactory;
> import org.drools.logger.KnowledgeRuntimeLogger;
> import org.drools.logger.KnowledgeRuntimeLoggerFactory;
> import org.drools.runtime.StatefulKnowledgeSession;
> import org.jbpm.process.workitem.wsht.HornetQHTWorkItemHandler;
> 
> 
> /**
>  * This is a sample file to launch a process.
>  */
> public class ProcessTest {
> 
> 
>           public static final void main(String[] args) {
>                     try {
>                               // load up the knowledge base
>                               KnowledgeBase kbase = readKnowledgeBase();
>                               StatefulKnowledgeSession ksession = createKnowledgeSession(kbase);
>                               KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newThreadedFileLogger(ksession, "test", 1000);
>                               // start a new process instance
>                               Map<String, Object> params = new HashMap<String, Object>();
>                               params.put("employee", "krisv");
>                               params.put("reason", "Yearly performance evaluation");
>                               ksession.startProcess("com.sample.evaluation", params);
>                               System.out.println("Process started ...");
>                               logger.close();
>                     } catch (Throwable t) {
>                               t.printStackTrace();
>                     }
>           }
> 
> 
>           private static KnowledgeBase readKnowledgeBase() throws Exception {
>                     KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder();
>                     kbuilder.add(ResourceFactory.newClassPathResource("Evaluation.bpmn"), ResourceType.BPMN2);
>                     return kbuilder.newKnowledgeBase();
>           }
> 
>           private static StatefulKnowledgeSession createKnowledgeSession(KnowledgeBase kbase) {
>                     StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession();
>                     HornetQHTWorkItemHandler humanTaskHandler = new HornetQHTWorkItemHandler(ksession);
>                     humanTaskHandler.setIpAddress("127.0.0.1");
>                     humanTaskHandler.setPort(5445);
>                     ksession.getWorkItemManager().registerWorkItemHandler("Human Task", humanTaskHandler);
>                     return ksession;
>           }
> 
> 
> 
> }
> 

When I ran the code above, the first task executed fine, but the second task gives me:
     java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper

> Process started ...
> Exception in thread "Thread-3" java.lang.ClassCastException: java.lang.String cannot be cast to org.jbpm.task.utils.MarshalledContentWrapper
>           at org.jbpm.task.utils.ContentMarshallerHelper.unmarshall(ContentMarshallerHelper.java:157)
>           at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler.handleCompletedTask(GenericHTWorkItemHandler.java:208)
>           at org.jbpm.process.workitem.wsht.GenericHTWorkItemHandler$TaskCompletedHandler$1.run(GenericHTWorkItemHandler.java:187)
>           at java.lang.Thread.run(Thread.java:722)
>
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