JbpmContext jbpmContext = jbpmTemplate.getJbpmConfiguration().createJbpmContext();
  try{
    GraphSession graphSession = jbpmContext.getGraphSession();
    //获取流程实例，这样是从数据库中解析流程实例的最后版本
    ProcessDefinition definition = graphSession.findLatestProcessDefinition("simple");
    
    //这里注释掉的是原来使用的代码，这样的话用的是spring生成的流程定义对象，是从xml解析来的
//    ProcessInstance pi = new ProcessInstance(jbpmTemplate.getProcessDefinition());
    ProcessInstance pi = definition.createProcessInstance();
    jbpmContext.save(pi);
  }
  finally{
    jbpmContext.close();
  }