GWT cron作业没有运行

Question

我正在创建一个小型网络应用。我有一个cron作业，可以从存储在数据库中的数据发送定期电子邮件。但是我不认为cron工作正在运行。

文件在这里。 cron.xml

<?xml version="1.0" encoding="UTF-8"?>
<cronentries>
    <cron>
        <url>/cron/MailingServlet</url>
        <description>Put your Cron Job description here</description>
        <schedule>every 1 minutes</schedule>
    </cron>

的web.xml

<servlet>
    <servlet-name>mailingService</servlet-name>
    <servlet-class>com.peter.from.cron.MailingServlet</servlet-class>   
</servlet>

<servlet-mapping>
    <servlet-name>mailingService</servlet-name>
    <url-pattern>/cron/MailingServlet</url-pattern>
</servlet-mapping>

</cronentries>

和MailingServlet.java

@Override
public void doGet(HttpServletRequest req, HttpServletResponse resp) {

    _logger.info("CRON EXECUTED");
    List<Note> notes = new ArrayList<Note>();
    PersistenceManager pm = PMF.getPersistenceManager();

    long now = System.currentTimeMillis();

    Query q = pm.newQuery(Note.class);
    q.setFilter("currentTime >= scheduledTime");
    q.declareParameters("long currentTime");

    try{
        notes =  (List<Note>) q.execute(now);
        for(Note n: notes){
            this.mail(n.getEmail(), n.getMessage());
            pm.deletePersistent(n);

        }

    }catch(Exception e){
        _logger.info(e.getLocalizedMessage());
    }
}

感谢任何帮助，谢谢。