关于JBPM启动并自动执行的有关问题

关于JBPM启动并自动执行的问题
有个问题请教大家，怎么让写好的JBPM流程启动后自动运行（因为我的流程中都是node，自动节点，中间不需要等待），我的理解的是用startprocessinstancecommand 启动一下就能执行，试了一下不行，加了个signalcommand，但执行完了数据库里（prcessinstance字段）显示实例已经运行完了，可是流程中的action都没执行是怎么回事啊 以下是试验代码 

Java code

      public class StartProcessTest {        long id;    private static JbpmConfiguration jbpmConfig = JbpmConfiguration            .getInstance();    private static CommandService commandService = new CommandServiceImpl(            jbpmConfig);    public static void main(String[] args) {        // TODO Auto-generated method stub        StartProcessTest test = new StartProcessTest();        try {            test.saveProcess();                    } catch (Exception e) {            e.printStackTrace();        }    }    public void saveProcess() throws Exception {         JbpmConfiguration jbpmconfig=JbpmConfiguration.getInstance();         jbpmconfig.createSchema();        ProcessDefinition definition = ProcessDefinition                .parseXmlResource("simple/processdefinition.xml");        definition.setName("first");        JbpmContext jbpmContext = jbpmConfig.createJbpmContext();        jbpmContext.deployProcessDefinition(definition);                StartProcessInstanceCommand startCommand = new StartProcessInstanceCommand();        startCommand.setProcessName("first");        ProcessInstance pi = (ProcessInstance) commandService                .execute(startCommand);        if (pi != null)    System.out.println("############OK##############"+"\n"+pi.getStart().toString());//        // signal service 1        SignalCommand signalCommand = new SignalCommand();                signalCommand.setTokenId(pi.getRootToken().getId());        commandService.execute(signalCommand);            jbpmContext.close();