Timer定时器报错

今天使用Timer写定时程序，tomcat启动的时候出现以下异常信息：

严重: Error listenerStart
2012-12-4 9:57:28 org.apache.catalina.core.StandardContext start
严重: Context [/YGCWEB] startup failed due to previous errors
dddddd
2012-12-4 9:57:28 org.apache.catalina.loader.WebappClassLoader clearReferencesThreads
严重: The web application [/YGCWEB] appears to have started a thread named [Timer-2] but has failed to stop it. This is very likely to create a memory leak.

Web.xml部分配置如下：

  <listener>
  <listener-class>cn.system.util.listener.SessionListener</listener-class>
 </listener>
    <listener>
  <listener-class>cn.system.util.listener.ContextListener</listener-class>
 </listener> 

    <listener>
  <listener-class>cn.business.bakefile.ListenerTimerAutoBakeFile</listener-class>
 </listener>
  <listener>
  <listener-class>cn.system.task.MyListener</listener-class>
 </listener>

MyListener.java如下：

package cn.system.task;

import java.util.Timer;

import javax.servlet.ServletContextEvent;
import javax.servlet.ServletContextListener;

public class MyListener implements ServletContextListener{

 private Timer myTaskTimer=null;
 @Override
 public void contextDestroyed(ServletContextEvent sce) {
  myTaskTimer=new Timer(true);
  myTaskTimer.schedule(new MyTask(),0,1000*60*60*24);
 }

 @Override
 public void contextInitialized(ServletContextEvent sce) {
  myTaskTimer.cancel();
 }

}

MyTask.java如下：

public class MyTask extends TimerTask{

 public void run() {
  System.out.println("dddddd");
 }

把web.xml的Listener去掉，启动tomcat可以正常访问，加上后就报严重信息，访问的时候报404

@Override
public void contextDestroyed(ServletContextEvent sce) {
myTaskTimer=new Timer(true);
myTaskTimer.schedule(new MyTask(),0,1000*60*60*24);
}

@Override
public void contextInitialized(ServletContextEvent sce) {
myTaskTimer.cancel();
}

写反了

contextInitialized 这是初始化 在这里创建
contextDestroyed这是容器销毁 在这里cancel