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I define the fisrt process definition as following:

ProcessEngine processEngine = new Configuration().setResource("jbpm.cfg.xml").buildProcessEngine();

  RepositoryService repositoryService = processEngine.getRepositoryService();

  ExecutionService executionService = processEngine.getExecutionService();

  repositoryService.createDeployment().addResourceFromClasspath("testFragment.jpdl.xml").deploy();

  executionService.startProcessInstanceByKey("testFragment");

The testFragment is as following;

<?xml version="1.0" encoding="UTF-8"?>

<process name="testFragment" xmlns="http://jbpm.org/4.4/jpdl">
   <start g="48,134,48,48" name="start">
      <transition name="to HelloWorld" to="HelloWorld" g="-87,-22"/>
   </start>
   <custom class="org.jbpm.testMigration.MyTest" g="359,196,92,52" name="Test">
      <transition name="to end" to="end" g="-43,-22"/>
   </custom>
   <java class="org.jbpm.testMigration.HelloWorld" g="147,194,92,52" method="printHelloWorld" name="HelloWorld">
      <transition name="to Test" to="Test" g="-45,-22"/>
   </java>
   <end g="554,146,48,48" name="end"/>
</process>

in custom node i throw an exception und catch it in catch block

catch (Exception e) {  

         System.out.println("we need the exception handling");

          activityExecution.waitForSignal();

        ProcessEngine processEngine = new Configuration().setResource("jbpm.cfg.xml").buildProcessEngine();

        RepositoryService repositoryService = processEngine.getRepositoryService();

        ExecutionService executionService = processEngine.getExecutionService();

        executionService.signalExecutionById("testFragment");

}

when i execute testFragment, the following execption occurres:

exception in thread "main" org.jbpm.api.JbpmException: execution testFragment does not exist.

how can i resume the testFragment? pleas help