Servlet / EJB Communication

Question

          Hello,
          I have a very simple stateless session bean that I've developed for testing. A Client.java class gets the initial context, gets the home interface of the bean, creates the bean, and removes the bean, all without any problems. However, when I instantiate the same client class in a servlet that I've registered in the weblogic.properties file, I get a ClassCastException when the Client casts the Home interface stub into the home interface class. ??? Any idea why I can't successfully use an EJB from within the servlet?
          Thanks in advance,
          Sam
          java.lang.ClassCastException: path.TestSessionBeanBeanHomeImpl_ServiceStub
          

Answer 1

Sam,
          This is a common problem starting out developing in WebLogic with servlets
          and EJBs. In the J2EE reference implementation and other servers, the WAR
          and JAR both have to contain the home/remote interfaces, since the EJB in
          the JAR needs them and the Servlets in the WAR need them. In WebLogic, to
          support a call-by-reference optimization (and because of some problems in
          the class loader design employed by WebLogic previous to v6), you must NOT
          put them (home/remote) into the WAR file.
          If you do not deploy as WAR and JAR, then just replace WAR with
          "servletclasses" and replace JAR with "serverclasses" in the paragraph
          above.
          Peace,
          Cameron Purdy
          Tangosol, Inc.
          http://www.tangosol.com
          +1.617.623.5782
          WebLogic Consulting Available
          "Sam Eubanks" <[email protected]> wrote in message
          news:[email protected]...
          >
          > Hello,
          >
          > I have a very simple stateless session bean that I've developed for
          testing. A Client.java class gets the initial context, gets the home
          interface of the bean, creates the bean, and removes the bean, all without
          any problems. However, when I instantiate the same client class in a
          servlet that I've registered in the weblogic.properties file, I get a
          ClassCastException when the Client casts the Home interface stub into the
          home interface class. ??? Any idea why I can't successfully use an EJB from
          within the servlet?
          >
          > Thanks in advance,
          > Sam
          >
          > java.lang.ClassCastException: path.TestSessionBeanBeanHomeImpl_ServiceStub