Problem to get Connection from JBoss AS

Question

PLEASE HELP ME....
I GOT ERROR WHILE I TRYED TO GET A CONNECTION FROM JBOSS APP. SERVER.
THE CODE IS
package com.beo.atlas.common;
public final class ServiceLocator     {
     private static final String JBOSS_INITIAL_CONTEXT_FACTORY = "org.jnp.interfaces.NamingContextFactory";
     private static final String JBOSS_PROVIDER_URL = "localhost:8080";
     private static final String JBOSS_URL_PKG_PREFIXES = "org.jboss.naming:org.jnp.interfaces";
     public static final String ATLAS_DATASOURCE = "java://myatlasdbpool";
     private static java.util.Hashtable dataSourceCache = null;
     private static ServiceLocator locator = null;
     static     {
          System.out.println("Locator Initializing");
          dataSourceCache = new java.util.Hashtable();
          locator = new ServiceLocator();
     private ServiceLocator()     {     }
     public static ServiceLocator newInstance()     {
          System.out.println("Returning the Locator Object");
          return locator;
     public java.sql.Connection getDBConnection() throws java.sql.SQLException,javax.naming.NamingException     {
          System.out.println("Getting Data base Connection....");
          if(dataSourceCache.containsKey(ATLAS_DATASOURCE))     {
               System.out.println("Trying to get Connection from CACHE...");
               System.out.println("Returning Connection Object from cache.");
               return (java.sql.Connection)dataSourceCache.get(ATLAS_DATASOURCE);
          System.out.println("FAILED to get Connection from CACHE");
          System.out.println("Trying to create new Connection...");
          java.util.Properties props = new java.util.Properties();
          props.put(javax.naming.Context.INITIAL_CONTEXT_FACTORY,JBOSS_INITIAL_CONTEXT_FACTORY);
          props.put(javax.naming.Context.PROVIDER_URL,JBOSS_PROVIDER_URL);
          props.put(javax.naming.Context.URL_PKG_PREFIXES, JBOSS_URL_PKG_PREFIXES );
          javax.naming.InitialContext context = new javax.naming.InitialContext(props);
          Object o = context.lookup(ATLAS_DATASOURCE);
          System.out.println("Object Created...");
          javax.sql.DataSource dataSource = null;
          try     {
          dataSource = (javax.sql.DataSource)javax.rmi.PortableRemoteObject.narrow(o,javax.sql.DataSource.class);
          }catch(Exception e)     {     
          java.sql.Connection con = dataSource.getConnection();
          dataSourceCache.put(ATLAS_DATASOURCE,con);
          System.out.println("Returning new Connection Object.");
          return con;          
ERROR
Locator Initializing
Returning the Locator Object
Getting Data base Connection....
FAILED to get Connection from CACHE
Trying to create new Connection...
Object Created...
java.lang.ClassCastException
at com.sun.corba.se.impl.javax.rmi.PortableRemoteObject.narrow(Unknown S
ource)
at javax.rmi.PortableRemoteObject.narrow(Unknown Source)
at com.beo.atlas.common.ServiceLocator.getDBConnection(ServiceLocator.ja
va:56)
at AtlasClient.printData(AtlasClient.java:16)
at AtlasClient.main(AtlasClient.java:8)
Caused by: java.lang.ClassCastException: org.jnp.interfaces.NamingContext
... 5 more

Answer 1

I've got the same problem. Working with JBoss 4.0.3 and Tomcat 5.5. The lookup goes fine and returns an object of type remote home, however when I perform the narrow() I get ClassCastException. I'm sure the client and the server have got the same file version as I built from the same source.
[error]
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)
[error]