Sorry - am using Eclipse in OSX and have no clue how to ask it to dump its classpath.I can print out the .classpath file but this is clearly not really relevant. <?xml version="1.0" encoding="UTF-8"?> <classpath> <classpathentry kind="src" path="src"/> <classpathentry kind="src" path="tests"/> <classpathentry kind="con" path="org.eclipse.jdt.launching.JRE_CONTAINER" /> <classpathentry kind="con" path="org.eclipse.pde.core.requiredPlugins"/> <classpathentry kind="con" path="org.eclipse.jdt.junit.JUNIT_CONTAINER/4" /> <classpathentry kind="output" path="bin"/> </classpath> Thanks for your reply. I am looking forward to solving this issue. - Mike I can print out Message: 1 Date: Mon, 31 Dec 2007 09:58:06 -0200 From: "Edson Tirelli" <tirelli(a)post.com&gt; Subject: Re: [rules-users] JUnit testing problem To: "Rules Users List" <rules-users(a)lists.jboss.org&gt; Message-ID: <e6dd5ba30712310358y555bf067laaf1c8b5a0acda7c(a)mail.gmail.com&gt; Content-Type: text/plain; charset="iso-8859-1" Mike, This looks like a classpath problem indeed. Did you tried asking the JVM to dump its classpath so that you can know for sure what jars are included and if any of them embeds a non-compatible ASM version ? []s Edson _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users