Error in executing jbpm code

[ajaykamath7]

i am runing below code code for Jbpm

package com.sample.action;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Iterator;
import java.util.List;

import org.jbpm.graph.def.ProcessDefinition;
import org.jbpm.graph.exe.ProcessInstance;
import org.jbpm.graph.exe.Token;
import org.jbpm.taskmgmt.def.Task;
import org.jbpm.taskmgmt.exe.TaskInstance;

public class TestWorkflow {

public static void main(String args[])throws Exception {
new TestWorkflow().execute();
}

public void execute() throws Exception {
// Extract process from the processdefinition.xml file.
ProcessDefinition processDefinition =ProcessDefinition.parseXmlResource("NewSample/processdefinition.xml");
ProcessInstance instance =new ProcessInstance(processDefinition);


displayStatus(instance);
instance.signal();

displayStatus(instance);
executeTask(instance);


displayStatus(instance);
executeTask(instance);

displayStatus(instance);


}

private void displayStatus(ProcessInstance instance) {


String nodeName = instance.getRootToken().getNode().getName();
System.out.println("task node executed: "+nodeName);

}

private void executeTask(ProcessInstance instance) {

// Get the Task Instance List
ArrayList taskList = new ArrayList(instance.getTaskMgmtInstance().getTaskInstances());
System.out.println("length" +taskList.size());
Iterator iter = taskList.iterator();

while (iter.hasNext()) {

TaskInstance taskInstance = (TaskInstance)iter.next();

System.out.println("Found Task "+taskInstance.getName());
System.out.println("Found Actor "+taskInstance.getActorId());

taskInstance.end();
System.out.println("Task completed");
}

}



}
i am getting the following error
Exception in thread "main" java.lang.IllegalStateException: task instance '0' is already ended

pls help...

[kukeltje]

taskList contains ALL tasks for a process, also the ended ones... so add an additional check to see if it is not already ended.

Only when you provide an actor, you get a list of unfinished tasks (but that method is on the JbpmContext