OC4J Standalone Remote Lookup

Question

Hello everyone,
I am getting the following error when I am trying to do a remote lookup to an ejb which has been deployed successfully on OC4J Standalone. My client who is attempting the look up has been successfully deployed in OC4J instance embedded in Oracle9ias.
The error tree is:
[ApplicationServerThread] DEBUG game.GameManager 2003-04-15 13:35:57,984 - Game Driver URL = 199.5.201.102:23791/loto User= admin Pass:admin
[ApplicationServerThread] DEBUG game.GameManager 2003-04-15 13:35:57,984 - Get Initial Context
[ApplicationServerThread] DEBUG game.GameManager 2003-04-15 13:35:57,984 - Context Lookup ID=loto
[ApplicationServerThread] DEBUG game.GameManager 2003-04-15 13:35:58,031 - Context Lookup found :loto Class Name = __Proxy0
[ApplicationServerThread] ERROR game.GameManager 2003-04-15 13:35:58,031 - Game (loto)Driver Loading Error
java.lang.NullPointerException
     at com.mot.vla.game.GameManager.getGameDriverFromURL(GameManager.java:253)
     at com.mot.vla.game.GameManager.getGameDriver(GameManager.java:231)
     at com.mot.vla.game.GameManager.getGameDesc(GameManager.java:77)
     at com.mot.vla.kernel.VlaPlayerKernel.getGameDescription(VlaPlayerKernel.java:147)
     at VlaPlayerKernelRemote_StatefulSessionBeanWrapper24.getGameDescription(VlaPlayerKernelRemote_StatefulSessionBeanWrapper24.java:1039)
     at com.mot.vla.ui.core.CoreServices.getGameDescription(CoreServices.java:677)
     at com.mot.vla.ui.core.CoreEngine.actionDispatcher(CoreEngine.java:163)
     at com.mot.vla.ui.core.CoreEngine.renderDocument(CoreEngine.java:122)
     at com.mot.vla.ui.core.CoreEngine.processRequest(CoreEngine.java:106)
     at com.mot.vla.ui.servlet.RequestHandler.doPost(RequestHandler.java:204)
     at com.mot.vla.ui.servlet.RequestHandler.doGet(RequestHandler.java:179)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:244)
     at javax.servlet.http.HttpServlet.service(HttpServlet.java:336)
     at com.evermind.server.http.ResourceFilterChain.doFilter(ResourceFilterChain.java:59)
     at oracle.security.jazn.oc4j.JAZNFilter.doFilter(JAZNFilter.java:283)
     at com.evermind.server.http.ServletRequestDispatcher.invoke(ServletRequestDispatcher.java:523)
     at com.evermind.server.http.ServletRequestDispatcher.forwardInternal(ServletRequestDispatcher.java:269)
     at com.evermind.server.http.HttpRequestHandler.processRequest(HttpRequestHandler.java:735)
     at com.evermind.server.http.AJPRequestHandler.run(AJPRequestHandler.java:151)
     at com.evermind.util.ThreadPoolThread.run(ThreadPoolThread.java:64)
From what I can tell, it looks like my lookup was successful but the class name is __Proxy0, which is weird.
Here are a sample of my code:
the parameters are: url = 199.5.201.102:23791/loto User= admin password:admin id:loto
public GameDriverRemote getGameDriverFromURL(String id, String url,
String user, String password) {
try {
Context context = getInitialContext(url, user, password);
logger.debug("Context Lookup ID="+id);
Object obj = context.lookup(id);
if (obj!=null) {
logger.debug("Context Lookup found :"+id+" Class Name = "+obj.getClass().getName());
GameDriverHome gameDriverHome = (com.mot.vla.game.GameDriverHome) PortableRemoteObject.narrow(obj, com.mot.vla.game.GameDriverHome.class);
String tt= gameDriverHome.getClass().getName();
logger.debug("Done looking up home =>"+tt);
if (gameDriverHome != null) {
System.out.println("Game (" + id + ") Driver Home Interface Found");
logger.debug("Game (" + id + ") Driver Home Interface Found");
GameDriverRemote gameDriverRemote = (com.mot.vla.game.GameDriverRemote) PortableRemoteObject.narrow(gameDriverHome.create(), com.mot.vla.game.GameDriverRemote.class);
return gameDriverRemote;
catch (Exception e) {
logger.error("Game (" + id + ")Driver Loading Error", e);
return null;
static public Context getInitialContext(String url, String user,
String password) throws Exception {
Hashtable env = new Hashtable();
// set the environment properties
System.out.println("Get Initial Context");
logger.debug("Get Initial Context");
env.put(Context.INITIAL_CONTEXT_FACTORY, "com.evermind.server.rmi.RMIInitialContextFactory");
env.put(Context.PROVIDER_URL, "ormi://"+url);
env.put(Context.SECURITY_PRINCIPAL, user);
env.put(Context.SECURITY_CREDENTIALS, password);
env.put("dedicated.connection","true");
try {
// create an initial context using the above environment properties
return (new InitialContext(env));
catch (Exception e) {
System.out.println("Context initializtion error");
e.printStackTrace();
logger.error("Context initializtion error", e);
return null;
any help will be appreciated

Answer 1

Hi Frances,
Here is our ejb-jar.xml;
<?xml version = '1.0' encoding = 'windows-1252'?>
<!DOCTYPE ejb-jar PUBLIC
     "-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN"
     "http://java.sun.com/dtd/ejb-jar_2_0.dtd">
<ejb-jar>
<enterprise-beans>
<session>
<description>Session Bean ( Stateless )</description>
<display-name>MySession</display-name>
<ejb-name>MySession</ejb-name>
<local-home>com.some.company.ejb.MySessionLocalHome</local-home>
<local>com.some.company.ejb.MySessionLocal</local>
<ejb-class>com.some.company.ejb.MySessionBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>MySession</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
And here is the orion-ejb-jar.xml;
<?xml version = '1.0' encoding = 'windows-1252'?>
<!DOCTYPE orion-ejb-jar PUBLIC
"-//Evermind//DTD Enterprise JavaBeans 1.1 runtime//EN"
"http://xmlns.oracle.com/ias/dtds/orion-ejb-jar.dtd">
<orion-ejb-jar>
<enterprise-beans>
<session-deployment name="MySession" location="ejb/MySession"/>
</enterprise-beans>
</orion-ejb-jar>