Alright, I am back. So I tried with your persistence.xml - and it works! It's the extra information (xmlns, xsi) that did the trick because I did have the name specified in my original persistence.xml. I gotta figure out what that extra bit does. Anyhow, moving on, I tried to run the Client. But the JVM is complaining that the class cannot be found. Now I have a question regarding this. Does the JVM look for Client.class in the EJB-JAR file or the directory where the classes had been generated and placed during compilation? Just to refresh, my directory structure looks like this: build.xml src/main/java/org/rij/*.java src/main/resources/META-INF/persistence.xml src/main/resources/jndi.properties target/classes/org/rij/*.class (all of the class files) target/classes/META-INF/persistence.xml target/mojo.jar Also. the part of build file that runs the client is as follows: | <target name="run.client" depends="ejbjar"> | <java classname="Client" fork="yes" dir="."> | <classpath refid="classpath"/> | </java> | </target> | Since the classpath is important, here is the relevant part of the build file that sets the classpath. | <property environment="env"/> | <property name="src.dir" value="${basedir}/src/main/java"/> | <property name="src.resources" value="${basedir}/src/main/resources"/> | <property name="jboss.dir" value="${env.JBOSS_HOME}"/> | <property name="jboss.deploy.dir" value="${jboss.dir}/server/default/deploy"/> | <property name="target.dir" value="${basedir}/target"/> | <property name="target.classes.dir" value="${basedir}/target/classes"/> | <property name="common.lib.one" value="C:/opt/jboss-5.0.0.GA/common/lib"/> | <property name="common.lib.two" value="C:/opt/jboss-5.0.0.GA/client"/> | | | | <!-- Next, specify where the client app is. client-config which has JNDI properties --> | <path id="classpath"> | <fileset dir="${common.lib.one}"> | <include name="*.jar"/> | </fileset> | <fileset dir="${common.lib.two}"> | <include name="*.jar"/> | </fileset> | <pathelement location="${target.dir}"/> | <pathelement location="${target.classes.dir}"/> | </path> | The second pathelement tag shows the exact location of the class, in case the JVM looks for the class file specifically. If instead the EJB-JAR is used, then I have not explicitly mentioned that. But my assumption is that the deploy directory in default server is automatically scanned? -Rij View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4219564#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...