Chiba, It seems that testng-5.8-jdk15.jar is already in classpath. Look at this: Thread.currentThread().getContextClassLoader() and classPool.getClass().getClassLoader() are the same: System.out.println(Thread.currentThread().getContextClassLoader()): | ClassRealm[/plugins/org.codecompany:jeha-plugin:1.0-SNAPSHOT@48/thread:main, parent: ClassRealm[plexus.core, parent: null]] | System.out.println(pool.getClass().getClassLoader()): | ClassRealm[/plugins/org.codecompany:jeha-plugin:1.0-SNAPSHOT@48/thread:main, parent: ClassRealm[plexus.core, parent: null]] | System.out.println(pool): | [class path: java.lang.Object.class;C:\Andre\workspace\Pessoal\jeha\jeha-test\target\classes;C:\Andre\workspace\Pessoal\jeha\jeha-test\target\test-classes;C:\Andre\workspace\Pessoal\jeha\jeha-test\target\classes;C:\Andre\workspace\Pessoal\jeha\jeha-core\target\classes;java.util.jar.JarFile@2585e;] | I believe that java.util.jar.JarFile@2585e corresponds to testng-5.8-jdk15.jar Would it happen if I put the whole class code here? View the original post : http://www.jboss.org/index.html?module=bb&op=viewtopic&p=4235472#... Reply to the post : http://www.jboss.org/index.html?module=bb&op=posting&mode=reply&a...