Gabriel Valencia [http://community.jboss.org/people/gvalenc] created the discussion "Lookup bean from AS 4.0.5 to 5.1.0" To view the discussion, visit: http://community.jboss.org/message/575250#575250 -------------------------------------------------------------- I have an EJB3 stateless session bean deployed in AS 5.1.0 that I am trying to look up from some client code deployed in a remote AS 4.0.5 installation. The client isn't a true EJB client, just something that happens to be running within the context of a 3rd party EJB in that server. Should this be possible? The client has the same class files inside its jar as those in the 5.1.0 bean's jar. I specifically set the JNDI provider URL to be the remote 5.1.0 server in the InitialContext properties before lookup. I get this exception during the narrow() call: Caused by: java.lang.ClassCastException         at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)         at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)         at com.venetica.vbr.res.ejb.EJBLocator.locateDirector(EJBLocator.java:115)         ... 23 more Caused by: java.lang.ClassCastException: javax.naming.Reference         at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)         ... 25 more Caused by: java.lang.ClassCastException         at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:229)         at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:137)         at ****(****.java:115)         ... 23 more Caused by: java.lang.ClassCastException: javax.naming.Reference         at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(PortableRemoteObject.java:212)         ... 25 more -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/575250#575250] Start a new discussion in JNDI and Naming at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]