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  Was able to get it working by removing certain jars from the .war files :

(Placing extracts from build.xml used)

http://blog.athico.com/2011/05/guvnor-wars-per-application-server.html

<target name="install.jBPM-gwt-console.into.jboss1" depends="download.h2,download.birt,download.jBPM.gwt-console">

    <!-- gwt-console -->

    <mkdir dir="${install.home}/target"/>

    <unzip src="${install.home}/lib/jbpm-${jBPM.version}-gwt-console.zip" dest="${install.home}/target" />

    <mkdir dir="${install.home}/target/jbpm-gwt-console-server-war"/>

    <unzip src="${install.home}/target/jbpm-gwt-console-server-${jBPM.version}.war"

           dest="${install.home}/target/jbpm-gwt-console-server-war"/>

    <copy file="${install.home}/db/hibernate.cfg.xml"

          tofile="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/classes/hibernate.cfg.xml"

          overwrite="true" />

    <copy file="${install.home}/db/persistence.xml"

          tofile="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/classes/META-INF/persistence.xml"

          overwrite="true" />

    <!-- Fix for conflicting javassist jar -->

          <echo message="Deleting conflicting jars from jbpm-gwt-console-server-war"/>

    <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/javassist-3.6.0.GA.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/jaxrs-api-1.0.2.GA.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/el-api.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/slf4j-api-1.6.0.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/slf-log4j12-1.6.0.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/slf4j-api-1.5.2.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/slf4j-log4j12-1.5.2.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/slf4j-simple-1.5.2.jar"/>

<!--          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/el-impl-1.0.jar"/> -->

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/javax.jsf_1.2.0.0.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/glassfish.jsf_1.2.3.2.jar"/>

          <delete file="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/lib/glassfish.jstl_1.2.0.1.jar"/>

    <!-- Other configuration like work item handlers -->

    <copy todir="${install.home}/target/jbpm-gwt-console-server-war/WEB-INF/classes" overwrite="true">

      <fileset dir="${install.home}/conf"/>

    </copy>

    <zip basedir="${install.home}/target/jbpm-gwt-console-server-war"

         destfile="${install.home}/target/jbpm-gwt-console-server-${jBPM.version}.war"/>

    <copy file="${install.home}/target/jbpm-gwt-console-server-${jBPM.version}.war"

          tofile="${jboss.server.deploy.dir}/jbpm-gwt-console-server.war"

          overwrite="true" />

    <copy file="${install.home}/target/jbpm-gwt-console-${jBPM.version}.war"

          tofile="${jboss.server.deploy.dir}/jbpm-gwt-console.war"

          overwrite="true" />

    <delete dir="${install.home}/target"/>

    <!-- db configuration -->

    <copy file="${install.home}/db/testDS1-ds.xml"

          tofile="${jboss.server.deploy.dir}/testDS1-ds.xml"

          overwrite="true" />

    <copy todir="${jboss.server.lib.dir}" overwrite="true">

      <fileset dir="${install.home}/db/driver"/>

    </copy>

    <!-- authentication configuration -->

    <copy file="${install.home}/auth/users.properties"

          tofile="${jboss.server.conf.dir}/users.properties"

          overwrite="true" />

    <copy file="${install.home}/auth/roles.properties"

          tofile="${jboss.server.conf.dir}/roles.properties"

          overwrite="true" />

    <!-- reporting -->

    <antcall target="install.reporting.into.jboss" />

  </target>

  2)

  <target name="install.guvnor.into.jboss.other1">

<mkdir dir="${install.home}/target/drools-guvnor"/>

    <unzip src="${install.home}/lib/guvnor-5.2.0.Final-jboss-as-6.0.war" dest="${install.home}/target/drools-guvnor" />

           <echo message="Removing the unrequired jars from drools-guvnor.war"/>

    <delete>

      <fileset dir="${install.home}/target/drools-guvnor/WEB-INF/lib" includes="xml-apis-*.jar"/>                   

                <fileset dir="${install.home}/target/drools-guvnor/WEB-INF/lib" includes="jta-*.jar"/>

                      <fileset dir="${install.home}/target/drools-guvnor/WEB-INF/lib" includes="slf4j-api-1.6.0.jar"/>

                      <fileset dir="${install.home}/target/drools-guvnor/WEB-INF/lib" includes="slf4j-log4j12-1.6.0.jar"/>

          <!--            <fileset dir="${install.home}/target/drools-guvnor/WEB-INF/lib" includes="jsf-api-*.jar"/> -->

                      <fileset dir="${install.home}/target/drools-guvnor/WEB-INF/lib" includes="javassist-*.jar"/>

                      <fileset dir="${install.home}/target/drools-guvnor/WEB-INF/classes/org/drools/guvnor/server/jaxrs" includes="GuvnorApplication.class"/>

    </delete>

    <zip basedir="${install.home}/target/drools-guvnor"

         destfile="${install.home}/target/drools-guvnor.war"/>

    <copy file="${install.home}/target/drools-guvnor.war"

          tofile="${jboss.server.deploy.dir}/drools-guvnor.war"

          overwrite="true" />

    <delete dir="${install.home}/target"/>

  </target>