Looks like you are going to learn how packages and classpaths relate (this is often a hurdle one has to overcome when learning Java). Your class is named Client and is in the com.ip6networks.calling_card_registration.test package. This means that the JVM will scan the classpath looking for a file named: com/ip6networks/calling_card_registration/test/Client.class This means that the classpath should be set to: /usr/liferay-portal-5.2.3/dev/portlets/calling_card_reg/docroot/WEB-INF/src/ in your case. Then the JVM will look for the file: /usr/liferay-portal-5.2.3/dev/portlets/calling_card_reg/docroot/WEB-INF/src/com/ip6networks/calling_card_registration/test/Client.class In addition, when you tell JUnit about the class, you need to use the full class name, which includes the package name: com.ip6networks.calling_card_registration.test.Client That should give you enough information to fix the build.xml. View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4244115#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...