public void execute() throws Exception     {         ProcessDefinition processDefinition = ProcessDefinition.parseXmlResource("TimerProcess/Tprocessdefinition.xml");         JbpmContext jbpmContext= JbpmConfiguration.getInstance().createJbpmContext();               System.out.println("------ parsing");                 try{             // Create an instance of the process definition.             ProcessInstance instance = processDefinition.createProcessInstance();             System.out.println("------------ deploying process");             jbpmContext.deployProcessDefinition(processDefinition);             instance.signal("trSetTimer");             JobExecutor jobExecutor =  jbpmContext.getJbpmConfiguration().getJobExecutor();             if  (jobExecutor==null) {                 throw new JbpmException("no job executor configured in resource  ");                 }               jobExecutor.start();             jbpmContext.save(instance);         }finally{             jbpmContext.close();              }                 }