PortableRemoteObject java.lang.ClassCastException

Question

Hi,
I have a object in jndi which i can lookup via a javabean in a jsp page.
When I run in debug mode it's the correct object which implements the interface I am casting to.
When I
Object test = PortableRemoteObject.narrow (beforeNarrow,narrow);I get a ClassCastException. even though the narrow 'Class' is the interface the object that I looked up implements.
Ideas?

Answer 1

public static Object lookup (String jndi, Class narrow)
          throws NamingException
          Object o = getContext ().lookup (jndi);
             Class objClass = o.getClass();
          logger.debug("objClass.getPackage()" + objClass.getPackage());
          logger.debug("objClass.getName()" + objClass.getName());
          logger.debug("narrowClass.getPackage()" + narrow.getPackage());
          logger.debug("narrowClass.getName()" + narrow.getName());
          Class[] ifaces = o.getClass ().getInterfaces ();
          for (int i = 0; i < ifaces.length; i++)
                 logger.debug("Current Interface = " + ifaces.getName());
               if (ifaces[i].getName().equals ("javax.jdo.PersistenceManagerFactory")){
               logger.debug("Matched Interface");
               if (ifaces[i] != narrow) {
                    logger.debug("### class objects not equal. hashcodes: "
                         + System.identityHashCode(ifaces[i]) + ", "
                         + System.identityHashCode(narrow));
          return PortableRemoteObject.narrow (getContext ().lookup (jndi),
               narrow);
called via
return (PersistenceManagerFactory) lookup (jndi,kodo.jdbc.ee.JDBCConnectionFactory.class);Output =
[08/Mar/2004:11:47:25] INFO (15476): CORE3282: stdout: 263565 [08.03.04 11:47:25,365] [service-j2ee] DEBUG samples.j2ee.SampleUtilities  - objClass.getPackage()null
[08/Mar/2004:11:47:25] INFO (15476): CORE3282: stdout: 263565 [08.03.04 11:47:25,365] [service-j2ee] DEBUG samples.j2ee.SampleUtilities  - objClass.getName()kodo.jdbc.ee.JDBCConnectionFactory
[08/Mar/2004:11:47:25] INFO (15476): CORE3282: stdout: 263565 [08.03.04 11:47:25,365] [service-j2ee] DEBUG samples.j2ee.SampleUtilities  - narrowClass.getPackage()package kodo.jdbc.ee
[08/Mar/2004:11:47:25] INFO (15476): CORE3282: stdout: 263565 [08.03.04 11:47:25,365] [service-j2ee] DEBUG samples.j2ee.SampleUtilities  - narrowClass.getName()kodo.jdbc.ee.JDBCConnectionFactory
[08/Mar/2004:11:47:25] INFO (15476): CORE3282: stdout: 264095 [08.03.04 11:47:25,895] [service-j2ee] DEBUG samples.j2ee.SampleUtilities  - Current Interface = kodo.ee.JDOConnectionFactory
[08/Mar/2004:11:47:25] SEVERE (15476): StandardWrapperValve[jsp]: Servlet.service() for servlet jsp threw exception
java.lang.ClassCastException
     at samples.j2ee.SampleUtilities.getPersistenceManagerFactory(SampleUtilities.java:80)
     at samples.j2ee.SampleUtilities.getPersistenceManager(SampleUtilities.java:65)
     at _jasper._test_jsp._jspService(_test_jsp.java:63)
     at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:107)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at com.iplanet.ias.web.jsp.JspServlet$JspServletWrapper.service(JspServlet.java:552)
     at com.iplanet.ias.web.jsp.JspServlet.serviceJspFile(JspServlet.java:368)
     at com.iplanet.ias.web.jsp.JspServlet.service(JspServlet.java:287)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
     at org.apache.catalina.core.StandardWrapperValve.invokeServletService(StandardWrapperValve.java:720)
     at org.apache.catalina.core.StandardWrapperValve.access$000(StandardWrapperValve.java:118)
     at org.apache.catalina.core.StandardWrapperValve$1.run(StandardWrapperValve.java:278)
     at java.security.AccessController.doPrivileged(Native Method)
     at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:274)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:212)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:203)
     at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:505)
     at com.iplanet.ias.web.connector.nsapi.NSAPIProcessor.process(NSAPIProcessor.java:157)
     at com.iplanet.ias.web.WebContainer.service(WebContainer.java:598)