IllegalArgumentException in Listener with weblogic 12.1.1

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Java

web_development

Im getting java.lang.IllegalArgumentException while deploying ear files in weblogic 12.1.1.0
This is happeneing because of listener in web.xml.
If i comment out listener, deployment is possible.But im not able to understand whats the issue with??
Can some one give some hints on this please.!!!


Old Weblogic version: 10.3.3
New weblogic version:12.1.1
Using Struts frame work.


SessionObject class:

public class SessionObject implements HttpSessionBindingListener{

public void valueBound( HttpSessionBindingEvent event)
{ }

public voind valueUnbound (HttpSessionBindingEvent event)
{ }

}



web.xml:

<listener>
<listener-class>com.ab.util.SessionObject</listener-class>
<listener>



I want to know that why im getting " java.lang.IllegalArgumentException:[HTTP:101164] User defined class com.ab.util.session object is not a listener as it doesnt implement the correct interface" error while deploying the ear file under version 12.1.1 when it is working fine with version 10.3.3.

Should i make any changes in web.xml or should i include any jars???