I have encountered the same problem: 18:06:59,866 WARN [verifier] EJB spec violation: Bean : Fibo Section: 22.2 Warning: The Bean Provider must specify the fully-qualified name of the Java class that implements the enterprise bean's business methods in the <ejb-class> element. Info : Class not found on 'tutorial.ejb.FiboBean': No ClassLoaders found for: tutorial.ejb.FiboBean 18:06:59,866 ERROR [MainDeployer] Could not create deployment: file:/C:/JBOSSIDE-1.6.0/jboss-4.0.4.GA/server/default/tmp/deploy/tmp47761FiboApp.ear-contents/FiboEJB.jar org.jboss.deployment.DeploymentException: Verification of Enterprise Beans failed, see above for error messages. at org.jboss.ejb.EJBDeployer.create(EJBDeployer.java:610) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) However, the problem did not happen then I perform the tutorial in another machine with the same software versions. Who can help explaining this situation? View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3963968#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...