loader constraints violated when linking javax/el/ELResolver class error

[prithviraj patil]

Whenever i try to run some application, i get resource not available 404 error. I checked the logs and I saw following error.
I searched on the internet, but nowhere correct information has given.

While starting tomcat I am getting this error:

Nov 17, 2009 6:04:25 PM org.apache.catalina.core.StandardContext listenerStart
SEVERE: Exception sending context initialized event to listener instance of class com.sun.faces.config.ConfigureListener
java.lang.LinkageError: loader constraints violated when linking javax/el/ELResolver class
	at com.sun.faces.config.ConfigureListener.registerELResolverAndListenerWithJsp(ConfigureListener.java:1633)
	at com.sun.faces.config.ConfigureListener.contextInitialized(ConfigureListener.java:453)
	at org.apache.catalina.core.StandardContext.listenerStart(StandardContext.java:3934)
	at org.apache.catalina.core.StandardContext.start(StandardContext.java:4429)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardHost.start(StandardHost.java:722)
	at org.apache.catalina.core.ContainerBase.start(ContainerBase.java:1045)
	at org.apache.catalina.core.StandardEngine.start(StandardEngine.java:443)
	at org.apache.catalina.core.StandardService.start(StandardService.java:516)
	at org.apache.catalina.core.StandardServer.start(StandardServer.java:710)
	at org.apache.catalina.startup.Catalina.start(Catalina.java:583)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.apache.catalina.startup.Bootstrap.start(Bootstrap.java:288)
	at org.apache.catalina.startup.Bootstrap.main(Bootstrap.java:413)
Nov 17, 2009 6:04:25 PM org.apache.catalina.core.StandardContext start
SEVERE: Error listenerStart
Nov 17, 2009 6:04:25 PM org.apache.catalina.core.StandardContext start
SEVERE: Context [/LogIt1] startup failed due to previous errors
Nov 17, 2009 6:04:25 PM org.apache.catalina.loader.WebappClassLoader validateJarFile
INFO: validateJarFile(D:\Prithvi\Project\Tools\Eclipse 3.3\workspace\.metadata\.plugins\org.eclipse.wst.server.core\tmp1\wtpwebapps\LogIt\WEB-INF\lib\servlet-api.jar) - jar not loaded. See Servlet Spec 2.3, section 9.7.2. Offending class: javax/servlet/Servlet.class
Nov 17, 2009 6:04:26 PM org.apache.catalina.core.StandardContext addApplicationListener
INFO: The listener "org.apache.myfaces.webapp.StartupServletContextListener" is already configured for this context. The duplicate definition has been ignored.
log4j:WARN No appenders could be found for logger (org.apache.myfaces.webapp.StartupServletContextListener).
log4j:WARN Please initialize the log4j system properly.
Nov 17, 2009 6:04:27 PM com.sun.faces.config.ConfigureListener contextInitialized
INFO: Initializing Sun's JavaServer Faces implementation (1.2_04-b07-FCS) for context '/LogIt'
Nov 17, 2009 6:04:27 PM org.apache.coyote.http11.Http11Protocol start
INFO: Starting Coyote HTTP/1.1 on http-1255
Nov 17, 2009 6:04:27 PM org.apache.jk.common.ChannelSocket init
INFO: JK: ajp13 listening on /0.0.0.0:1256
Nov 17, 2009 6:04:28 PM org.apache.jk.server.JkMain start
INFO: Jk running ID=0 time=0/79  config=null
Nov 17, 2009 6:04:28 PM org.apache.catalina.startup.Catalina start
INFO: Server startup in 5867 ms

I am using eclipse for development. Following is the configuration in my web.xml:

<?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" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" id="WebApp_ID" version="2.5">
  <display-name>LogIt</display-name>
  <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>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
  </servlet-mapping>
  
<!-- ******************************************************************************* -->

    <!-- Extensions Filter -->
    <filter>
      <description>Set the size limit for uploaded files.
                Format: 10 - 10 bytes
                        10k - 10 KB
                        10m - 10 MB
                        1g - 1 GB
      </description>
	  <filter-name>MyFacesExtensionsFilter</filter-name>
	  <filter-class>org.apache.myfaces.webapp.filter.ExtensionsFilter</filter-class>
      <init-param>
            <param-name>maxFileSize</param-name>
            <param-value>20m</param-value>
      </init-param>
    </filter>
    
    <!-- extension mapping for adding <script/>, <link/>, and other resource tags to JSF-pages  -->
    <filter-mapping>
        <filter-name>MyFacesExtensionsFilter</filter-name>
        <!-- servlet-name must match the name of your javax.faces.webapp.FacesServlet entry -->
        <servlet-name>Faces Servlet</servlet-name>
    </filter-mapping>

    <!-- extension mapping for serving page-independent resources (javascript, stylesheets, images, etc.)  -->
    <filter-mapping>
        <filter-name>MyFacesExtensionsFilter</filter-name>
        <url-pattern>/faces/myFacesExtensionResource/*</url-pattern>
    </filter-mapping>


    <context-param>
        <description>
            Comma separated list of URIs of (additional) faces config files.
            (e.g. /WEB-INF/my-config.xml)
            See JSF 1.0 PRD2, 10.3.2
        </description>
        <param-name>javax.faces.CONFIG_FILES</param-name>
        <param-value>
            /WEB-INF/faces-config.xml
        </param-value>
    </context-param>

    <context-param>
        <description>
            State saving method: "client" or "server" (= default)
            See JSF Specification 2.5.2
        </description>
        <param-name>javax.faces.STATE_SAVING_METHOD</param-name>
        <param-value>client</param-value>
    </context-param>

    <context-param>
        <description>
            This parameter tells MyFaces if javascript code should be allowed in the
            rendered HTML output.
            If javascript is allowed, command_link anchors will have javascript code
            that submits the corresponding form.
            If javascript is not allowed, the state saving info and nested parameters
            will be added as url parameters.
            Default: "true"
        </description>
        <param-name>org.apache.myfaces.ALLOW_JAVASCRIPT</param-name>
        <param-value>true</param-value>
    </context-param>

    <context-param>
        <description>
            If true, rendered HTML code will be formatted, so that it is "human readable".
            i.e. additional line separators and whitespace will be written, that do not
            influence the HTML code.
            Default: "true"
        </description>
        <param-name>org.apache.myfaces.PRETTY_HTML</param-name>
        <param-value>true</param-value>
    </context-param>

    <context-param>
        <param-name>org.apache.myfaces.DETECT_JAVASCRIPT</param-name>
        <param-value>false</param-value>
    </context-param>

    <context-param>
        <description>
            If true, a javascript function will be rendered that is able to restore the
            former vertical scroll on every request. Convenient feature if you have pages
            with long lists and you do not want the browser page to always jump to the top
            if you trigger a link or button action that stays on the same page.
            Default: "false"
        </description>
        <param-name>org.apache.myfaces.AUTO_SCROLL</param-name>
        <param-value>true</param-value>
    </context-param>

    <!-- Listener, that does all the startup work (configuration, init). -->
    <listener>
        <listener-class>org.apache.myfaces.webapp.StartupServletContextListener</listener-class>
    </listener>

</web-app>

Following is the list of different jars in my lib folder:
commons-beanutils-1.8.0-BETA.jar
commons-beanutils-bean-collections-1.8.0-BETA.jar
commons-beanutils-core-1.8.0-BETA.jar
commons-collections-3.2.jar
commons-digester-1.8.jar
commons-el.jar
commons-logging-1.1.1.jar
hsqldb.jar
jsf-api-1.2_04.jar
jsf-impl-1.2_04.jar
jstl-1.2.jar
log4j-123.jar
myfaces-impl-1.1.5.jar
servlet-api.jar
tomahawk-1.1.3.jar


Please anyone can give me some expert solution for this. I am stuck up with this problem for past two days