Usar EJB Timer Service

package fsg;

import java.util.logging.Logger;
import javax.annotation.PostConstruct;
import javax.annotation.Resource;
import javax.ejb.Startup;
import javax.ejb.Timeout;
import javax.ejb.Timer;
import javax.ejb.Singleton;

@Singleton

@Startup

public class TimeService {
  static Logger log = Logger.getLogger("");

  @Resource
  javax.ejb.TimerService timerService;
  public void startTimer(){
    timerService.createTimer(20000, "Fluid Attacks Timer");
    log.info("Fluid Attacks Timer created at: " + new java.util.Date());
  }

@Timeout
  public void delayedAction(Timer timer) {
    try {
      log.info("Executing timer: " + timer.getInfo());
      log.info("Fluid Attacks Timer action executed at: " + new java.util.Date());
    }
    catch (Exception e) {
      log.warning("Exception while getting timer information");
    }
  }
}

package fsg;

import java.io.IOException;
import javax.ejb.EJB;
import javax.ejb.EJBs;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

@WebServlet("/Time")
public class TimeServlet extends HttpServlet {
  private static final long serialVersionUID = 1L;

  @EJB
  private TimeService timerEJB;
  public TimeServlet() {
    super();
  }

  protected void doGet(HttpServletRequest request, HttpServletResponse response) throws
     ServletException, IOException {
       response.setContentType("text/html;charset=UTF-8");
       java.io.PrintWriter out = response.getWriter();
       timerEJB.startTimer();
       out.println("Processing the request at: " + new java.util.Date());
       out.close();
    }
}

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