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NullPointerException when timeout transition maps to a Java activity
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reply from <a href="http://community.jboss.org/people/sameeh.harfoush">Sameeh Harfoush</a> in <i>jBPM</i> - <a href="http://community.jboss.org/message/534833#534833">View the full discussion</a>
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<div class="jive-rendered-content"><p>Hello<br/>I tried to eliminate the timer and made the <decision> transition maps to a java activity in order to see if the problem is with the Timer timeout trigger. <br/>After executing the workflow and when the decision handler returns "Approve" the java activity gets executed and throws a NullPointerException (see below). But when I replace the java activity with a <state> the java activity gets executed and no exception is thrown.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Below is all the data you asked for.</p><p>Regards</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>Exception:</strong><br/>### EXCEPTION ###########################################<br/>11:26:47,828 INF   | [DefaultCommandService] exception while executing command org.jbpm.pvm.internal.cmd.CompleteTaskCmd@1f52460<br/>java.lang.NullPointerException<br/>    at org.jbpm.pvm.internal.wire.usercode.UserCodeReference.getProcessDefinition(UserCodeReference.java:75)<br/>    at org.jbpm.pvm.internal.wire.usercode.UserCodeReference.getObject(UserCodeReference.java:60)<br/>    at org.jbpm.pvm.internal.wire.usercode.UserCodeReference.getObject(UserCodeReference.java:51)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl.initializeAssignments(ExecutionImpl.java:759)<br/>    at org.jbpm.jpdl.internal.activity.TaskActivity.execute(TaskActivity.java:95)<br/>    at org.jbpm.jpdl.internal.activity.TaskActivity.execute(TaskActivity.java:58)<br/>    at org.jbpm.pvm.internal.model.op.ExecuteActivity.perform(ExecuteActivity.java:60)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:656)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:616)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)<br/>    at java.lang.reflect.Method.invoke(Unknown Source)<br/>    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl_$$_javassist_5.performAtomicOperation(ExecutionImpl_$$_javassist_5.java)<br/>    at org.jbpm.pvm.internal.model.op.TransitionEndActivity.perform(TransitionEndActivity.java:58)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperationSync(ExecutionImpl.java:656)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl.performAtomicOperation(ExecutionImpl.java:616)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:417)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl.signal(ExecutionImpl.java:403)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)<br/>    at java.lang.reflect.Method.invoke(Unknown Source)<br/>    at org.hibernate.proxy.pojo.javassist.JavassistLazyInitializer.invoke(JavassistLazyInitializer.java:197)<br/>    at org.jbpm.pvm.internal.model.ExecutionImpl_$$_javassist_5.signal(ExecutionImpl_$$_javassist_5.java)<br/>    at org.jbpm.pvm.internal.task.TaskImpl.complete(TaskImpl.java:194)<br/>    at org.jbpm.pvm.internal.task.TaskImpl.complete(TaskImpl.java:186)<br/>    at org.jbpm.pvm.internal.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:67)<br/>    at org.jbpm.pvm.internal.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:32)<br/>    at org.jbpm.pvm.internal.svc.DefaultCommandService.execute(DefaultCommandService.java:42)<br/>    at org.jbpm.pvm.internal.tx.StandardTransactionInterceptor.execute(StandardTransactionInterceptor.java:54)<br/>    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.executeInNewEnvironment(EnvironmentInterceptor.java:53)<br/>    at org.jbpm.pvm.internal.svc.EnvironmentInterceptor.execute(EnvironmentInterceptor.java:40)<br/>    at org.jbpm.pvm.internal.svc.RetryInterceptor.execute(RetryInterceptor.java:55)<br/>    at org.jbpm.pvm.internal.svc.SkipInterceptor.execute(SkipInterceptor.java:43)<br/>    at org.jbpm.pvm.internal.svc.TaskServiceImpl.completeTask(TaskServiceImpl.java:88)<br/>    at com.roxana.test.jpdl.EmployeeTimesheetTest.executeTransitionInTask(EmployeeTimesheetTest.java:180)<br/>    at com.roxana.test.jpdl.EmployeeTimesheetTest.testManagerApproveTimesheet(EmployeeTimesheetTest.java:135)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)<br/>    at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)<br/>    at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)<br/>    at java.lang.reflect.Method.invoke(Unknown Source)<br/>    at junit.framework.TestCase.runTest(TestCase.java:164)<br/>    at org.jbpm.test.BaseJbpmTestCase.runTest(BaseJbpmTestCase.java:80)<br/>    at junit.framework.TestCase.runBare(TestCase.java:130)<br/>    at junit.framework.TestResult$1.protect(TestResult.java:106)<br/>    at junit.framework.TestResult.runProtected(TestResult.java:124)<br/>    at junit.framework.TestResult.run(TestResult.java:109)<br/>    at junit.framework.TestCase.run(TestCase.java:120)<br/>    at junit.framework.TestSuite.runTest(TestSuite.java:230)<br/>    at junit.framework.TestSuite.run(TestSuite.java:225)<br/>    at org.eclipse.jdt.internal.junit.runner.junit3.JUnit3TestReference.run(JUnit3TestReference.java:130)<br/>    at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)<br/>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)<br/>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)<br/>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)<br/>    at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)<br/>### EXCEPTION ###########################################</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><strong>JPDL:</strong><br/><span><process name="timesheetWorkflow" xmlns="</span><a class="jive-link-external-small" href="http://jbpm.org/4.3/jpdl" target="_blank">http://jbpm.org/4.3/jpdl</a><span>"></span><br/>    <start g="142,11,48,48" name="start"><br/>        <transition name="start workflow" g="-153,-18"<br/>            to="Employee submits timesheet" /><br/>    </start><br/>    <task g="84,85,164,47" name="Employee submits timesheet"><br/>        <assignment-handler><br/>            <field name="assignee"><br/>                <string value="sameeh" /><br/>            </field><br/>        </assignment-handler><br/>        <transition name="to group" g="-150,-18" to="manager bookkeeper group" /><br/>    </task><br/>    <group name="manager bookkeeper group"><br/>        <start><br/>            <transition name="to manager" to="Manager reviews timesheet" /><br/>        </start><br/>        <task g="105,159,156,52" name="Manager reviews timesheet"><br/>            <assignment-handler><br/>                <field name="assignee"><br/>                    <string value="Mahmoud" /><br/>                </field><br/>            </assignment-handler></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>            <!--timeout transition can be to other subprocess --><br/>            <transition g="433,186;435,673:-43,-16" name="Manager timeout"<br/>                to="Manager review SLA"><br/>                <timer duedate="12 hours" /><br/>            </transition><br/>            <transition g="-68,-18" to="Manager evaluation" /><br/>        </task></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <sub-process name="Manager review SLA" sub-process-key="ManagerReviewSLA"<br/>            g="118,106,99,52"><br/>            <transition name="to accounts" to="Send timesheet to accounts"></transition><br/>        </sub-process></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <decision g="159,267,48,48" name="Manager evaluation"><br/>            <handler /><br/>            <transition g="-93,-11" name="Approve" to="Send timesheet to accounts" /><br/>            <transition g="348,292;352,673:-82,-206" name="Reject" to="Employee submits timesheet" /><br/>        </decision><br/>                <br/><strong>                <!--     <br/>        <state name="Send timesheet to accounts"> <br/>          <transition g="-83,-8"    to="Bookkeeper reviews and posts timesheet" /><br/>        </state><br/>                --></strong></p><p><strong><br/></strong></p><p><strong>        <java g="102,356,163,52" class="com.roxana.test.jpdl.TimesheetManager"<br/>            method="manageTimesheet" name="Send timesheet to accounts"><br/>            <transition g="-83,-8" name="to Bookkeeper"<br/>                to="Bookkeeper reviews and posts timesheet" /><br/>        </java></strong><br/> <br/>        <task g="64,453,240,52" name="Bookkeeper reviews and posts timesheet"><br/>            <assignment-handler><br/>                <field name="assignee"><br/>                    <string value="Mr.bookkeeper" /><br/>                </field><br/>            </assignment-handler><br/>            <transition name="to group end" g="-125,-3"<br/>                to="manager bookkeeper group end" /><br/>        </task></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        <end name="manager bookkeeper group end" /><br/>        <transition to="Accounting department pays employee" /><br/>                <br/>    </group><br/>    <task g="77,567,219,52" name="Accounting department pays employee"><br/>        <assignment-handler><br/>            <field name="assignee"><br/>                <string value="Mr.accountant" /><br/>            </field><br/>        </assignment-handler><br/>        <transition g="-42,-18" name="to end" to="end" /><br/>    </task><br/>    <end g="167,651,48,48" name="end" /><br/>    <timer duedate="72 hours"></timer><br/></process></p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p><br/><strong>JUnit</strong><br/>package com.roxana.test.jpdl;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import java.util.HashMap;<br/>import java.util.Iterator;<br/>import java.util.List;<br/>import java.util.Map;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import org.jbpm.api.Execution;<br/>import org.jbpm.api.JobQuery;<br/>import org.jbpm.api.ProcessInstance;<br/>import org.jbpm.api.TaskQuery;<br/>import org.jbpm.api.job.Job;<br/>import org.jbpm.api.job.Timer;<br/>import org.jbpm.api.task.Task;<br/>import org.jbpm.test.JbpmTestCase;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class EmployeeTimesheetTest extends JbpmTestCase {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    String deploymentId;<br/>    String ManagerSlaDeploymentId;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    protected void setUp() throws Exception {<br/>        super.setUp();<br/>        deploymentId = repositoryService<br/>                .createDeployment()<br/>                .addResourceFromClasspath(<br/>                        "com/roxana/test/jpdl/EmployeeTimesheetWorkflow.jpdl.xml")<br/>                .deploy();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        ManagerSlaDeploymentId = repositoryService.createDeployment()<br/>                .addResourceFromClasspath(<br/>                        "com/roxana/test/jpdl/ManagerReviewSLA.jpdl.xml")<br/>                .deploy();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    protected void tearDown() throws Exception {<br/>        repositoryService.deleteDeploymentCascade(deploymentId);<br/>        repositoryService.deleteDeploymentCascade(ManagerSlaDeploymentId);<br/>        super.tearDown();<br/>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void testManagerApproveTimesheet() {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        Map<String, Object> variableMap = new HashMap();<br/>        // variableMap.put("action", "reject");<br/>        variableMap.put("action", "approve");</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        ProcessInstance processInstance = executionService<br/>                .startProcessInstanceByKey("timesheetWorkflow", variableMap);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        String processInstanceId = processInstance.getId();</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        executeTransitionInTask(processInstance.getId(),<br/>                "Employee submits timesheet", null);// employee</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        executeTransitionInTask(processInstance.getId(),<br/>                "Manager reviews timesheet", null);// manager<br/>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private void executeTimerInTask(ProcessInstance pi, String transitionName) {<br/>        List<Job> jobslist = managementService.createJobQuery().timers()<br/>                .processInstanceId(pi.getId()).list();<br/>        Job job2 = null;<br/>        for (Iterator<Job> i = jobslist.iterator(); i.hasNext();) {<br/>            job2 = i.next();<br/>            // System.out.println("****"+((Timer)job2).getSignalName());<br/>            if (((Timer) job2).getSignalName().trim().equals(transitionName))<br/>                managementService.executeJob(job2.getId());<br/>        }<br/>    }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    private void executeTransitionInTask(String piId, String taskName,<br/>            String transitionName) {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        ProcessInstance pi = executionService.findProcessInstanceById(piId);</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        if (transitionName != null) {<br/>            executeTimerInTask(pi, transitionName);<br/>        } else {<br/>            TaskQuery taskQuery = taskService.createTaskQuery();<br/>            List<Task> allTasks = taskQuery.list();<br/>            Task task = null;<br/>            for (Iterator<Task> i = allTasks.iterator(); i.hasNext();) {<br/>                task = i.next();<br/>                if (task.getActivityName().trim().equals(taskName))<br/>                    break;<br/>            }<br/>            if (task != null) {<br/>                System.out.println("task.getId() = "<br/>                        + taskService.getOutcomes(task.getId()));<br/>                taskService.completeTask(task.getId());<br/>            }</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>        }<br/>    }<br/>}</p><p><strong>TimesheetManager.java</strong>:</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>package com.roxana.test.jpdl;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>import java.io.Serializable;</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>public class TimesheetManager implements Serializable {</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>    public void manageTimesheet(){<br/>        System.out.println("timesheet sent to accounting");<br/>    }<br/>}</p></div>
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