problem in accessing a distributed EJB through a servlet

[mara thamizhan]

Dear all,
I'm a trying to call a stateless session bean which has its home and component interfaces, which prints the name it receives from the servlet client.
I'm trying to access a remote server EJB beans, which has been registered with JNDI & when deploying the EJB beans onto the Jboss server which operates in localhost: 8081 it has shown

  
 
20:19:16,890 INFO  [EjbModule] Deploying greetBean
   20:19:17,109 INFO  [ProxyFactory] Bound EJB Home 'greetBean' to jndi 'greetJndi'
20:19:17,125 INFO  [EJBDeployer] Deployed: file:/C:/jboss-4.0.5.GA/server/default/deploy/greet.jar
  

This is my servlet which is there in tomcat container which runs in localhost:8082 to access the bean:

import java.net.*;
import javax.ejb.*;
import javax.rmi.*;
import java.rmi.*;
import javax.naming.*;
import java.util.*;
import java.io.*;
import javax.servlet.*;
import javax.servlet.http.*;
 
public class greetServlet extends HttpServlet
{
public void doPost
(HttpServletRequest req, HttpServletResponse res)
throws ServletException,IOException
{
res.setContentType("text/html");
PrintWriter out=res.getWriter();
try
{
out.println("Inside servlet");
Properties props=new Properties();
props.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
[B]props.put(Context.PROVIDER_URL, "localhost:8081");[/B]
props.put(Context.URL_PKG_PREFIXES, "org.jboss.naming :-o	 rg.jnp.interfaces");
System.out.println("Properties ok");
Context ctx=new InitialContext(props);
System.out.println("context ok");
greetHome home = (greetHome)
ctx.lookup("greetJndi");
System.out.println("home ok");
greetRemote remote=home.create();
System.out.println("remote ok");
String a = req.getParameter("text1");
String s = remote.greetme(a);
System.out.println(s);
out.println(s);
}
catch(Exception e)
{System.out.println(""+e);}
}
}
 

    

Then in my tomcat container console it's showing exception like:

 
 
 javax.naming.CommunicationException: Could not obtain connection to any of these
 urls: localhost:8081 and discovery failed with error: javax.naming.Communicatio
nException: Receive timed out [Root exception is java.net.SocketTimeoutException
: Receive timed out] [Root exception is javax.naming.CommunicationException: Fai
led to retrieve stub from server localhost:8081 [Root exception is java.io.EOFEx
ception]]
 
   

Could anyone encountered this problem & could anyone say how to fix this issue.

[Deepak Bala]

java.net.SocketTimeoutException

It appears your client is unable to talk with the server. Do you have a firewall ? Are you able to access the JBoss console ? Does the target JBoss server have your bean deployed ?

You will have to change your name. namma thamizhan translates to our tamilian and it is not a valid name.

[Marco Ehrentreich]

Hi Namma,

it seems to be a problem with the JNDI lookup. Are you using JBoss with a default configuration? Then localhost and port 8081 would be wrong. The default options for the JNDI lookup with JBoss are as follows:

java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
java.naming.provider.url=jnp://localhost:1099
java.naming.factory.url.pkgs=org.jboss.naming :-o	 rg.jnp.interfaces

You should first try to set the port to 1099 in your properties for this is the default port a client (here: your servlet) has to use to get a JNDI lookup from JBoss.

Marco

[Anoopp Thakur]

I'm trying to access a remote server EJB beans...

And also as it is a remote server, in place of localhost it should be

  java.naming.provider.url=jnp://[B]Remote_ServerName[/B]:1099  

[mara thamizhan]

when i change the properties url to jnp:localhost

props.put(Context.PROVIDER_URL, "jnp://localhost:1099");    

again it's throwing Unmarshal exception

The full stack trace of the exception is:

javax.naming.CommunicationException [Root exception is java.rmi.ServerException:
 RemoteException occurred in server thread; nested exception is:
        java.rmi.UnmarshalException: error unmarshalling arguments; nested excep
tion is:
        java.net.MalformedURLException: no protocol: Files/Apache]
    

[mara thamizhan]

I've found out the solution and i need to install my webapplication in a tomcat directory without whitepsaces i.e. c:\program files\apache\.....\tomcat5.5 is the cause of these exception.

 
javax.naming.CommunicationException [Root exception is java.rmi.ServerException:
 RemoteException occurred in server thread; nested exception is:
        java.rmi.UnmarshalException: error unmarshalling arguments; nested excep
tion is:
        java.net.MalformedURLException: no protocol: Files/Apache]