jboss and jbuilder, ejb & servlets - how?

[adrian79]

Hello everybody,

I'm new to both EJB's and JBoss. I'm trying to integrate Borland's JBuilder to work with JBoss. I can run a test program from jbuilder that accesses a session ejb from jboss and calls some of its methods.

The problem is when I try to access the session ejb from a servlet. I know I have to declare the ejb's I access ( and I did that, although I'm not sure if I did it right ). Also, to test my servlet I use the built-in tomcat that comes with JBuilder.

In my standalone program (which works ok) I have something like:

InitialContext jndiContext = new InitialContext();
TestHome home = (TestHome) jndiContext.lookup("test/Test");
Test test = home.create();
test.doSomething();

Using the exact same code in a servlet I get the following exception:

javax.naming.CommunicationException [Root exception is java.lang.ClassNotFoundException: com.adrian.ejbtest.TestHome]

So my question is: does anyone have a working example for a servlet running with jbuilder's built-in tomcat, that successfully accesses a session ejb and calls one of its methods? Does anyone have a guide on how to do this? Or do I have to use the tomcat that comes with jboss, and deploy a web application etc.

Any ideas are highly appreciated.

Thank you,
Adrian.

[seybaaa]

well I have made a war with my servlet,and a jar
with my ejb,then just copy the war in tomcat webApp
then just pus jar in jboss deploy that works very find
good luck

[sebaseba]

I do not know the details of your JNDI configuration, but it looks to me like you need to replace

InitialContext jndiContext = new InitialContext();

by something like this:

Properties prop = new Properties();
prop.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
prop.put(Context.PROVIDER_URL, "localhost:1099");
Context ctx = new InitialContext(prop);

Otherwise your servlet does not know how to connect to JNDI, as suggested by the error message you are getting.

Sebastian

[alcaponi]

Hi all,
Following Sebastian's post, I'm trying to run a servlet on Tomcat 3.2 that would look up an EJB on JBoss 3.0a and invoke that EJB's method.
(Both Tomcat and JBoss are on my localhost)
Now when I invoke the servlet from a JSP, I get the following error:

Internal Servlet Error:

javax.servlet.ServletException: Naming Exception creating Initial Context
Cannot instantiate class: org.jnp.interfaces.NamingContextFactory
at com.mybean.CalculateLoanServlet.init(CalculateLoanServlet.java:34)
at org.apache.tomcat.core.ServletWrapper.doInit(ServletWrapper.java:317)
at org.apache.tomcat.core.Handler.init(Handler.java:215)
at org.apache.tomcat.core.ServletWrapper.init(ServletWrapper.java:296)
at org.apache.tomcat.core.Handler.service(Handler.java:254)
at org.apache.tomcat.core.ServletWrapper.service(ServletWrapper.java:372)
at org.apache.tomcat.core.ContextManager.internalService(ContextManager.java:806)
at org.apache.tomcat.core.ContextManager.service(ContextManager.java:752)
at org.apache.tomcat.service.http.HttpConnectionHandler.processConnection(HttpConnectionHandler.java:213)
at org.apache.tomcat.service.TcpWorkerThread.runIt(PoolTcpEndpoint.java:416)
at org.apache.tomcat.util.ThreadPool$ControlRunnable.run(ThreadPool.java:501)
at java.lang.Thread.run(Thread.java:484)


This is the servlet init method where the exception occurs.

import java.io.*;
import java.util.*;
import javax.rmi.PortableRemoteObject;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.naming.InitialContext;
import javax.naming.Context;
import javax.naming.NamingException;
import org.jnp.interfaces.NamingContextFactory;

public class CalculateLoanServlet extends HttpServlet
{
  private static final String CONTENT_TYPE = "text/html";
  protected Context initCtx = null;

  /**Initialize global variables*/
  public void init(ServletConfig config) throws ServletException
  {
    super.init(config);
    try
    {
      Hashtable env = new Hashtable();
      env.put(Context.INITIAL_CONTEXT_FACTORY, "org.jnp.interfaces.NamingContextFactory");
      env.put(Context.PROVIDER_URL, "localhost:1099");
      Context initCtx = new InitialContext(env);
    }
    catch(NamingException ne)
    {
      throw new ServletException("Naming Exception creating Initial Context " +
ne.getMessage());
    }
  }
...
}


Can anyone help?
Thanx!
Al

[sammy-t]

The original error seemed to be a classpath problem. You can test that theory quickly by copying $JBOSS_HOME/client/*.jar to $JAVA_HOME/jre/lib/ext then restart your server. This will only help on the ClassNotFound errors, the other errors appear to be genuine JNDI configuration problems that I haven't seen yet :) If that 5 second hack fixes your ClassNotFound error, then you need to fix your classpath properly else the Java-Grue will eat you. I run Tomcat independantly of JBoss, and I had that problem because Tomcat's startup script wasn't adding jboss/client to the extdirs.