Hi All,

     I am deploying my web application - test.war on JBoss 6.

After successful deployment when I try to log in I get following exception

complete request: org.springframework.web.util.NestedServletException: Handler processing failed; nested exception is java.lang.LinkageError: loader constraint violation: when resolving interface method "org.hibernate.event.EventSource.getTransaction()Lorg/hibernate/Transaction;" the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) of the current class, org/hibernate/envers/synchronization/AuditProcessManager, and the class loader (instance of org/jboss/classloader/spi/base/BaseClassLoader) for resolved class, org/hibernate/event/EventSource, have different Class objects for the type org/hibernate/Transaction used in the signature

I am putting jboss-classloading.xml here.

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<?xml version="1.0" encoding="UTF-8"?>

<!--See http://phytodata.wordpress.com/2010/10/21/demystifying-the-jboss5-jboss-classloading-xml-file-->

<classloading xmlns="urn:jboss:classloading:1.0"

              name="emhada.war"   

              domain="emhada"

              parent-first="false"

              export-all="NON_EMPTY"

              import-all="true">

    <parent-policy>

      <before-filter>

       <javabean xmlns="urn:jboss:javabean:2.0" class="org.jboss.classloader.plugins.filter.NegatingClassFilter">

        <constructor>

         <parameter>

          <javabean xmlns="urn:jboss:javabean:2.0" class="org.jboss.classloader.spi.filter.PackageClassFilter">

           <constructor>

            <parameter>org.hibernate,org.apache.commons.collections,com.sun.mail.smtp</parameter>

           </constructor>

          </javabean>

         </parameter>

        </constructor>

       </javabean>

      </before-filter>

    </parent-policy>             

</classloading>

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Also putting a snippet of persistence.xml which may be responsible for the exception:

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<property name="hibernate.ejb.event.post-insert"

                        value="org.hibernate.ejb.event.EJB3PostInsertEventListener,org.hibernate.envers.event.AuditEventListener" />

            <property name="hibernate.ejb.event.post-update"

                        value="org.hibernate.ejb.event.EJB3PostUpdateEventListener,org.hibernate.envers.event.AuditEventListener" />

            <property name="hibernate.ejb.event.post-delete"

                        value="org.hibernate.ejb.event.EJB3PostDeleteEventListener,org.hibernate.envers.event.AuditEventListener" />

            <property name="hibernate.ejb.event.pre-collection-update"

                        value="org.hibernate.envers.event.AuditEventListener" />

            <property name="hibernate.ejb.event.pre-collection-remove"

                        value="org.hibernate.envers.event.AuditEventListener" />

            <property name="hibernate.ejb.event.post-collection-recreate"

                        value="org.hibernate.envers.event.AuditEventListener" />

            <property name="org.hibernate.envers.audit_table_prefix" value="A" />

            <property name="org.hibernate.envers.audit_table_suffix" value="" />

            <property name="org.hibernate.envers.do_not_audit_optimistic_locking_field" value="false" />

            <property name="org.hibernate.envers.store_data_at_delete" value="true" />

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I read following link : http://wiki.metawerx.net/wiki/Java.lang.LinkageError

It says :

This error occurs when two classloaders have loaded the same class with different signatures.

ie: you have the same class twice in your CLASSPATH, but the classes are different (usually different versions).

But I did not find org.hibernate.event.EventSource loaded twice.

Please throw light on it.So that I can manage to solve this error.

Thanks