5 Replies Latest reply on Nov 15, 2006 4:03 PM by Srdjan Djuricic

    ClassCastException with PortableRemoteObject.narrow call

    Srdjan Djuricic Newbie

      I want to call an ejb component located on a different machine and I can not get it to work. So I tried to deploy it under local copy of jboss and try to invoke it. I was able to call it. So i tried adding Context.PROVIDER_URL with my localhost set. I always get the ClassCastException. If I am remove the line from below everything works fine.

      String host = "jnp://localhost:1099";
      props.setProperty(Context.PROVIDER_URL, host);

      2006-11-03 10:17:18,319 ERROR [STDERR] java.lang.ClassCastException
      2006-11-03 10:17:18,319 ERROR [STDERR] at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narr
      2006-11-03 10:17:18,319 ERROR [STDERR] at javax.rmi.PortableRemoteObject.narrow(PortableRemoteObjec

      As soon as I uncomment that props.setProperty(Context.PROVIDER_URL, host);
      line everything works fine.
      I have seen this type of exception before when I tried invoking the ejb on a different computer as well. When I inspect the object with reflection I see that it found the right remote home interface.

      This is my code:

      Properties props = new Properties();

      props.setProperty(Context.SECURITY_PRINCIPAL, "admin");
      props.setProperty(Context.SECURITY_CREDENTIALS, "admin");
      props.put(javax.naming.Context.URL_PKG_PREFIXES, "org.jboss.naming:org.jnp.interfaces");

      String host = "jnp://localhost:1099";
      props.setProperty(Context.PROVIDER_URL, host);
      ctx = new InitialContext( props );

      Object object = ctx.lookup( "ejb/com/blah/Manager" );

      ManagerRemoteHome home = (ManagerRemoteHome)PortableRemoteObject.narrow ( object, ManagerRemoteHome.class);
      ManagerRemote manager = home.create();