[jboss-user] [jBPM] New message: "Strange Fork Behavior"

Andre Muniz do-not-reply at jboss.com
Wed Jan 20 12:36:40 EST 2010

User development,

A new message was posted in the thread "Strange Fork Behavior":


Author  : Andre Muniz
Profile : http://community.jboss.org/people/andre.muniz

I'm getting an unexpected behavior on the following test process:

When task2 is completed and the execution reaches fork2, JBPM 4.3 is duplicating task3, and I'm getting 3 pending tasks instead of two.
Here is the unit test for this process.
package test2;
import java.util.List;
import org.jbpm.api.task.Task;
import org.jbpm.test.JbpmTestCase;
public class ForkTest extends JbpmTestCase {
    /** Deployment id. */
    String deploymentId;
     * Set up.
     * @throws Exception exception
    protected void setUp() throws Exception {
        // XML definition
        StringBuilder jpdl = new StringBuilder();
        jpdl.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
        jpdl.append("<process key=\"forkTest\" name=\"Fork Test\" xmlns=\"http://jbpm.org/4.3/jpdl\">");
        jpdl.append("   <start g=\"7,137,48,48\" name=\"Lease Termination\">");
        jpdl.append("      <transition g=\"-43,-18\" name=\"to fork1\" to=\"fork1\"/>");
        jpdl.append("   </start>");
        jpdl.append("   <end g=\"841,83,48,48\" name=\"end1\"/>");
        jpdl.append("   <fork g=\"118,140,48,48\" name=\"fork1\">");
        jpdl.append("      <transition g=\"-44,-18\" name=\"to task1\" to=\"task1\"/>");
        jpdl.append("      <transition g=\"-44,-18\" name=\"to task2\" to=\"task2\"/>");
        jpdl.append("   </fork>");
        jpdl.append("   <task candidate-groups=\"leasing\" g=\"231,71,92,52\" name=\"task1\">");
        jpdl.append("      <transition name=\"to join2\" to=\"join2\" g=\"-41,-18\"/>");
        jpdl.append("   </task>");
        jpdl.append("   <task candidate-groups=\"leasing\" g=\"230,225,92,52\" name=\"task2\">");
        jpdl.append("      <transition name=\"to fork2\" to=\"fork2\" g=\"-43,-18\"/>");
        jpdl.append("   </task>");
        jpdl.append("   <task candidate-groups=\"leasing\" g=\"507,188,92,52\" name=\"task3\">");
        jpdl.append("      <transition g=\"-41,-18\" name=\"to join1\" to=\"join1\"/>");
        jpdl.append("   </task>");
        jpdl.append("   <task candidate-groups=\"leasing\" g=\"511,306,92,52\" name=\"task4\">");
        jpdl.append("      <transition g=\"-41,-18\" name=\"to join1\" to=\"join1\"/>");
        jpdl.append("   </task>");
        jpdl.append("   <join g=\"653,244,48,48\" name=\"join1\">");
        jpdl.append("      <transition g=\"-44,-18\" name=\"to task5\" to=\"task5\"/>");
        jpdl.append("   </join>");
        jpdl.append("   <task candidate-groups=\"leasing\" g=\"781,237,92,52\" name=\"task5\">");
        jpdl.append("      <transition g=\"-41,-18\" name=\"to join2\" to=\"join2\"/>");
        jpdl.append("   </task>");
        jpdl.append("   <join g=\"674,80,48,48\" name=\"join2\">");
        jpdl.append("      <transition g=\"-42,-18\" name=\"to end1\" to=\"end1\"/>");
        jpdl.append("   </join>");
        jpdl.append("   <fork g=\"402,232,48,48\" name=\"fork2\">");
        jpdl.append("      <transition g=\"-44,-18\" name=\"to task3\" to=\"task3\"/>");
        jpdl.append("      <transition g=\"-44,-18\" name=\"to task4\" to=\"task4\"/>");
        jpdl.append("   </fork>");
        // Deploys the process
        deploymentId =
                repositoryService.createDeployment().addResourceFromString("forkTest.jpdl.xml", jpdl.toString())
     * Tear down.
     * @throws Exception exception
    protected void tearDown() throws Exception {
     * Tests the process.
    public void testProcess() {
        // Starts a new process instance
        // Collection to store the pending tasks
        List < Task > taskList = null;
        // Sets if it's to check the number of tasks after the fork2 (2 tasks - task3 and task4)
        boolean checkNumberOfTasks = false;
        // Loop
        do {
            // Gets the pending tasks
            taskList = taskService.createTaskQuery().list();
            // If it's to check the number of tasks, do it
            if (checkNumberOfTasks) {
                assertEquals(2, taskList.size());
            // Iterates the tasks list
            for (Task t : taskList) {
                // If the execution reaches the task2, changes the boolean, so the next iteration checks the number of tasks
                if ("task2".equals(t.getName()))
                    checkNumberOfTasks = true;
                // Completes the task
        } while (taskList != null && taskList.size() > 0);

Does anyone have any idea what is going on? Thanks!


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