re: Can not find resource instance in ServletContextListener ?

[Mark Curlette]

Hello All,
Hope you have a good week. I am struggling with the error which is it can not find resource instance from my ServletContextListener. It seems that it should be working but it did not. I can not figure out why and I'd like to get your help.
If you happen to know what I did wrong then please show me. 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>

The error I got :

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