Listener servlet run time error

[Mark Curlette]

Good morning All,
Hope you all have a great Friday . I am struggling with the error from my listener servlet and I could not figure it out why it can not find my resource instance eventhough i declared it in both my web.xml and context.xml.
I am going to post my codes and my error message here; and hopefully you may tell me what's going on.

For the information, I am using Tomcat 7.0 web server.

I declared a resource reference named TimerManager in my web.xml and my context.xml, and i try to look for it using InitialContext from my ServletContextListener.


Thanks so much in advance.

My ServletContextListener is as following:

package org.minh;   
  
import javax.naming.InitialContext;   
import javax.naming.NamingException;   
import javax.servlet.ServletContextEvent;   
import javax.servlet.ServletContextListener;   
import javax.servlet.annotation.WebListener;   
import javax.servlet.http.HttpSessionEvent;   
import javax.servlet.http.HttpSessionListener;   
  
import commonj.timers.TimerManager;   
  
/**  
 * Application Lifecycle Listener implementation class myListener  
 *  
 */  
@WebListener  
public class myListener implements ServletContextListener, HttpSessionListener {   
  
    /**  
     * Default constructor.   
     */  
    public myListener() {   
        // TODO Auto-generated constructor stub   
    }   
  
    /**  
     * @see ServletContextListener#contextInitialized(ServletContextEvent)  
     */  
    public void contextInitialized(ServletContextEvent arg0) {   
        // TODO Auto-generated method stub   
        System.out.println ("Servlet context is initialzed. It starting!!!!");   
         InitialContext ic = null;   
        try {   
            ic = new InitialContext();   
        } catch (NamingException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }     
         try {   
            TimerManager tm = (TimerManager)ic.lookup("java:comp/env/tm/TimerManager");   
        } catch (NamingException e) {   
            // TODO Auto-generated catch block   
            e.printStackTrace();   
        }      }   
  
    /**  
     * @see HttpSessionListener#sessionCreated(HttpSessionEvent)  
     */  
    public void sessionCreated(HttpSessionEvent arg0) {   
        // TODO Auto-generated method stub   
        System.out.println ("Session created !!!");   
    }   
  
    /**  
     * @see HttpSessionListener#sessionDestroyed(HttpSessionEvent)  
     */  
    public void sessionDestroyed(HttpSessionEvent arg0) {   
           
        System.out.println ("Session is destroyed!!!");   
        // TODO Auto-generated method stub   
    }   
  
    /**  
     * @see ServletContextListener#contextDestroyed(ServletContextEvent)  
     */  
    public void contextDestroyed(ServletContextEvent arg0) {   
        // TODO Auto-generated method stub   
        System.out.println ("Servlet context is destroyed!!!");   
    }   
       
}  

my web.xml is as following :

<?xml version="1.0" encoding="UTF-8"?>   
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">   
     
     
<listener>   
    <listener-class>org.minh.myListener</listener-class>   
    </listener>     
     
  <display-name>Listener3</display-name>   
     
     
   <resource-ref>   
    <res-ref-name>tm/TimerManager</res-ref-name>   
    <res-type>commonj.timers.TimerManager</res-type>   
    <res-auth>Container</res-auth>   
    <res-sharing-scope>Shareable</res-sharing-scope>   
  </resource-ref>   
     
  <welcome-file-list>   
    <welcome-file>index.html</welcome-file>   
    <welcome-file>index.htm</welcome-file>   
    <welcome-file>index.jsp</welcome-file>   
    <welcome-file>default.html</welcome-file>   
    <welcome-file>default.htm</welcome-file>   
    <welcome-file>default.jsp</welcome-file>   
  </welcome-file-list>   
</web-app>  

My context.xml is as following :

<?xml version="1.0" encoding="UTF-8"?>   
<!--   
  Licensed to the Apache Software Foundation (ASF) under one or more   
  contributor license agreements.  See the NOTICE file distributed with   
  this work for additional information regarding copyright ownership.   
  The ASF licenses this file to You under the Apache License, Version 2.0  
  (the "License"); you may not use this file except in compliance with   
  the License.  You may obtain a copy of the License at   
  
      http://www.apache.org/licenses/LICENSE-2.0   
  
  Unless required by applicable law or agreed to in writing, software   
  distributed under the License is distributed on an "AS IS" BASIS,   
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.   
  See the License for the specific language governing permissions and   
  limitations under the License.   
--><!-- The contents of this file will be loaded for each web application --><Context>   
  
    <!-- Default set of monitored resources -->   
    <WatchedResource>WEB-INF/web.xml</WatchedResource>   
  
    <!-- Uncomment this to disable session persistence across Tomcat restarts -->   
    <!--   
    <Manager pathname="" />   
    -->   
  
    <!-- Uncomment this to enable Comet connection tacking (provides events   
         on session expiration as well as webapp lifecycle) -->   
    <!--   
    <Valve className="org.apache.catalina.valves.CometConnectionManagerValve" />   
    -->   
  
<Resource name="timer/TestTimer" auth="Container"  
            type="commonj.timers.TimerManager"/>   
  
<Resource name="tm/TimerManager" auth="Container"  
            type="commonj.timers.TimerManager"/>   
  
  
<Environment name="ets/pollInterval" value="4000000"     
         type="java.lang.String" override="false"/>      
</Context>  

and finally my error message is :

Servlet context is initialzed. It starting!!!!   
javax.naming.NamingException: Cannot create resource instance   
    at org.apache.naming.factory.ResourceFactory.getObjectInstance(ResourceFactory.java:146)   
    at javax.naming.spi.NamingManager.getObjectInstance(NamingManager.java:321)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:826)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:145)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:814)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:145)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:814)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:145)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:814)   
    at org.apache.naming.NamingContext.lookup(NamingContext.java:159)   
    at org.apache.naming.SelectorContext.lookup(SelectorContext.java:158)   
    at javax.naming.InitialContext.lookup(InitialContext.java:411)   
    at org.minh.myListener.contextInitialized(myListener.java:41)   
    at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4701)   
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5204)   
    at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5199)   
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)   
    at java.util.concurrent.FutureTask.run(FutureTask.java:166)   
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)   
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)   
    at java.lang.Thread.run(Thread.java:722)   
Aug 01, 2013 3:43:53 PM org.apache.coyote.AbstractProtocolHandler start   
INFO: Starting ProtocolHandler ["http-bio-8080"]   
Aug 01, 2013 3:43:53 PM org.apache.coyote.AbstractProtocolHandler start   
INFO: Starting ProtocolHandler ["ajp-bio-8009"]   
Aug 01, 2013 3:43:53 PM org.apache.catalina.startup.Catalina start   
INFO: Server startup in 282 ms  

[Ishan Pandya]

what if you chage line 41 of myListener.java to

TimerManager tm = (TimerManager)ic.lookup("tm/TimerManager"); 

I am not sure but can you try it and tell what happens?

[Mark Curlette]

Yes, I just changed it to

TimerManager tm = (TimerManager)ic.lookup("tm/TimerManager");   

as you suggested, and it gave me the error message saying that

javax.naming.NameNotFoundException: Name tm is not bound in this Context
	at org.apache.naming.NamingContext.lookup(NamingContext.java:803)
	at org.apache.naming.NamingContext.lookup(NamingContext.java:159)
	at org.apache.naming.SelectorContext.lookup(SelectorContext.java:158)
	at javax.naming.InitialContext.lookup(InitialContext.java:411)
	at org.minh.myListener.contextInitialized(myListener.java:42)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:4701)
	at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5204)
	at org.apache.catalina.core.StandardContext$1.call(StandardContext.java:5199)
	at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
	at java.util.concurrent.FutureTask.run(FutureTask.java:166)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
	at java.lang.Thread.run(Thread.java:722)
Aug 02, 2013 10:23:34 AM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["http-bio-8080"]
Aug 02, 2013 10:23:34 AM org.apache.coyote.AbstractProtocolHandler start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
Aug 02, 2013 10:23:34 AM org.apache.catalina.startup.Catalina start
INFO: Server startup in 308 ms

Does anyone have an aswer why it could not perform the look up? It seems to be very straight forward as it explains in the book , but it did turn out so.

Thanks in advance for your help,

Mark