first program in J2EE

From:

zbiszko <zbiszko1@wp.pl>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 28 Mar 2008 02:15:08 -0700 (PDT)

Message-ID:

<3ba97084-0c31-43b2-b2ab-9f21b8186437@m3g2000hsc.googlegroups.com>

Hi

I was trying to write my first program in J2EE, but something is wrong
in my code and I cannot find the bug:(

I have create EJB Module :Conv-ejb containning such files:
ConverterBean, ConverterLocal, ConverterRemote.
Also I have created client aplication. When I am running the clint I
get such exception:
Wyj=B1tek!!
javax.naming.NameNotFoundException
        at
com.sun.enterprise.naming.TransientContext.resolveContext(TransientContext.j=
ava:
268)
        at
com.sun.enterprise.naming.TransientContext.lookup(TransientContext.java:
191)
        at
com.sun.enterprise.naming.SerialContextProviderImpl.lookup(SerialContextProv=
iderImpl.java:
74)
        at
com.sun.enterprise.naming.RemoteSerialContextProviderImpl.lookup(RemoteSeria=
lContextProviderImpl.java:
129)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:
39)
        at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl=
..java:
25)
        at java.lang.reflect.Method.invoke(Method.java:597)
        at
com.sun.corba.ee.impl.presentation.rmi.ReflectiveTie._invoke(ReflectiveTie.j=
ava:
154)
        at
com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatchToSe=
rvant(CorbaServerRequestDispatcherImpl.java:
687)
        at
com.sun.corba.ee.impl.protocol.CorbaServerRequestDispatcherImpl.dispatch(Cor=
baServerRequestDispatcherImpl.java:
227)
        at
com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequestRequest=
(CorbaMessageMediatorImpl.java:
1846)
        at
com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaM=
essageMediatorImpl.java:
1706)
        at
com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleInput(CorbaMes=
sageMediatorImpl.java:
1088)
        at
com.sun.corba.ee.impl.protocol.giopmsgheaders.RequestMessage_1_2.callback(Re=
questMessage_1_2.java:
223)
        at
com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.handleRequest(CorbaM=
essageMediatorImpl.java:
806)
        at
com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.dispatch(CorbaMessag=
eMediatorImpl.java:
563)
        at
com.sun.corba.ee.impl.protocol.CorbaMessageMediatorImpl.doWork(CorbaMessageM=
ediatorImpl.java:
2567)
        at
com.sun.corba.ee.impl.orbutil.threadpool.ThreadPoolImpl
$WorkerThread.run(ThreadPoolImpl.java:555)

What is wrong in my code? I am using netbeans.

Thanks for any help:)
Best Regards
Mariusz

################
files:

################ file: ConverterBean

package conv;

import java.rmi.RemoteException;
import javax.ejb.EJBException;
import javax.ejb.Remote;
import javax.ejb.SessionBean;
//import javax.ejb.Stateless;
import javax.ejb.SessionContext;
import javax.ejb.Stateless;

/**
*
* @author mariusz
*/
@Stateless
@Remote(ConverterRemote.class)
public class ConverterBean implements SessionBean{

    public int getValue(String letter)
            throws RemoteException
    {
        if (letter.equals("a"))
            return 1;
        else
            return 2;
    }

    public ConverterBean() {}
    public void setSessionContext(SessionContext arg0){ }
    public void ejbRemove() { }
    public void ejbActivate() { }
    public void ejbPassivate() { }

}

################

################ file: ConverterLocal

package conv;

import java.rmi.RemoteException;
import javax.ejb.CreateException;
import javax.ejb.EJBHome;
import javax.ejb.Local;

/**
*
* @author mariusz
*/
@Local
public interface ConverterLocal extends EJBHome
{
    ConverterRemote create()
            throws RemoteException, CreateException;
}

################

################ file ConverterRemote
package conv;

import java.rmi.RemoteException;
import javax.ejb.EJBObject;
import javax.ejb.Remote;

/**
*
* @author mariusz
*/
@Remote
public interface ConverterRemote extends EJBObject
{
    public int getValue(String letter)
            throws RemoteException;
################

################ client aplication
/*
* To change this template, choose Tools | Templates
* and open the template in the editor.
*/

package convClient;

import conv.ConverterLocal;
import conv.ConverterRemote;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.rmi.PortableRemoteObject;

/**
*
* @author mariusz
*/
public class Main {

    /**
     * @param args the command line arguments
     */
    public static void main(String[] args) {
        // TODO code application logic here
        try {
            Context initial = new InitialContext();
            Context myEnv = (Context) initial.lookup("java:comp/env");
            Object objRef = myEnv.lookup("MyConverterBean");
            ConverterLocal home = (ConverterLocal)
PortableRemoteObject.narrow(objRef, ConverterLocal.class);
            ConverterRemote conv = home.create();

            int a1 = conv.getValue("a");
            int a2 = conv.getValue("b");

            System.out.println("\nlicz1 = "+a1);
            System.out.println("\nlicz2 = "+a2);
            System.exit(0);

        } catch (Exception ex)
        {
          System.err.println("Wyj=B1tek!!");
          ex.printStackTrace();
        }
    }
}

################

################ application-client.xml
<?xml version="1.0" encoding="UTF-8"?>
<application-client version="5" xmlns="http://java.sun.com/xml/ns/
javaee";
                    xmlns:xsi="http://www.w3.org/2001/XMLSchema-
instance";
                    xsi:schemaLocation="http://java.sun.com/xml/ns/
javaee

http://java.sun.com/xml/ns/javaee/application-client_5.xsd">;

    <display-name>Conv-app-client</display-name>
    <ejb-ref>
        <ejb-ref-name>MyConverterBean</ejb-ref-name>
        <ejb-ref-type>Session</ejb-ref-type>
        <remote>conv.ConverterRemote</remote>
    </ejb-ref>

</application-client>