Servlet Client for EJB

Hi,
Till now i had normal java client for my EJB Programs.. I use j2ee 1.4 AppServer
Whenever i run my java program i used to set classpath for the returned client jar file and appserv-rt.jar but now when i run my servlet client program i don know how to set them and hence when i run the servlet i get an error saying No class def found for home interface...
How do i rectify this?
Waiting for ur replies!
Thanks,
Akshatha

Hi,
Inspite of putting my jar file i am getting the no
class def found error. So how do i
proceed further?
AkshathaDid you put the EJB client jar in the WEB-INF/lib directory for your web application as suggested?

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    at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
    .java:566)
    at org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve
    .java:246)
    at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
    .java:564)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
    a:472)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
    at org.apache.catalina.core.StandardContext.invoke(StandardContext.java:
    2314)
    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
    ava:164)
    at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
    .java:566)
    at org.apache.catalina.authenticator.SingleSignOn.invoke(SingleSignOn.ja
    va:368)
    at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
    .java:564)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
    a:472)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
    ve.java:163)
    at org.apache.catalina.core.StandardPipeline.invokeNext(StandardPipeline
    .java:566)
    at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
    a:472)
    at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:943)
    at org.apache.catalina.connector.http.HttpProcessor.process(HttpProcesso
    r.java:995)
    at org.apache.catalina.connector.http.HttpProcessor.run(HttpProcessor.ja
    va:1088)
    at java.lang.Thread.run(Thread.java:484)
    ======== EXCEPTION END ===========
    Tweaking with the servlet client code, I have discovered that it is failing to perform a correct lookup. Can anybody suggest any remedy? My Source code is below:
    =========================================================
    ============ Remote Interface START ==============
    // The DisplayApp Remote Interface File
    import javax.ejb.*;
    import java.rmi.*;
    public interface Display extends EJBObject
         public String display() throws RemoteException;
    ============ Remote Interface END ==============
    ============ Home Interface START ==============
    // The DisplayApp Home Interface File
    import javax.ejb.*;
    import java.rmi.*;
    public interface DisplayHome extends EJBHome
         public Display create() throws RemoteException, CreateException;
    ============ Home Interface END ==============
    ============ Bean Class START ==============
    // The DisplayApp Bean Class File
    import javax.ejb.*;
    import java.rmi.*;
    public class DisplayBean implements SessionBean
         public String display() throws RemoteException
              System.out.println("The Server Side Response");
              return "Hello, Me a New Friend";
         public void ejbCreate(){}
         public void ejbRemove(){}
         public void ejbActivate(){}
         public void ejbPassivate(){}
         public void setSessionContext(SessionContext ctx){}
    ============ Bean Class END ==============
    ========== Console Client Class START ======
    // The Display Console Client Class File
    import javax.ejb.*;
    import javax.rmi.*;
    import javax.naming.*;
    import Display;
    import DisplayHome;
    public class DisplayConsoleClient
         public DisplayConsoleClient()
              try
                   Context initial=new InitialContext();
                   Object objref=initial.lookup("java:comp/env/DisplayJNDI");
                   DisplayHome home=(DisplayHome)PortableRemoteObject.narrow(objref, DisplayHome.class);
                   Display ref=home.create();
                   System.out.println("Client Side: "+ref.display());
                   ref.remove();
              catch(Exception ex)
                   System.out.println("Exception in Client Code: "+ex);
                   ex.printStackTrace();
         public static void main(String args[])
              new DisplayConsoleClient();
    ========== Console Client Class END ======
    ========== Servlet Client Class START ======
    // The DisplayApp Servlet Client Class File
    import javax.ejb.*;
    import javax.rmi.*;
    import javax.naming.*;
    import Display;
    import DisplayHome;
    import javax.servlet.*;
    import javax.servlet.http.*;
    import java.io.*;
    public class DisplayServletClient extends HttpServlet
         private PrintWriter out;
         public void service(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException
              try
              System.out.println("Servlet Entered");
              response.setContentType("text/html");
              System.out.println("HTML Content Type Set");
              out=response.getWriter();
              System.out.println("PrintWriter Object Created");
              Context initial=new InitialContext();
              System.out.println("Context Object Created");
              Object objref=initial.lookup("java:comp/env/ejb/DisplayWEBJNDI");
              System.out.println("Lookup Done Successfully");
              DisplayHome home=(DisplayHome)PortableRemoteObject.narrow(objref, DisplayHome.class);
              System.out.println("Home Object Created");
              Display ref=home.create();
              System.out.println("Remote Object Created");
              out.println("<html><title>The Results Page</title>");
              out.println("<body<hr>");
              out.println("<h1>The Client Side Response is: ");
              out.println(ref.display());
              out.println("</h1>");
              out.println("<hr>");
              out.println("</body></html>");
              System.out.println("Responses Done");
              out.flush();
              System.out.println("Output Stream Flushed");
              ref.remove();
              System.out.println("Remote Object Removed");
              catch(Exception ex)
                   System.out.println("Exception in Servlet Client Code: "+ex);
                   ex.printStackTrace();
    ========== Servlet Client Class END ======
    ========== Calling HTML File START ======
    <html>
    <body>
    <hr>
    <form method="get" action="/servlet/DisplayServletClient">
    <input type="submit" name="submit" value="Call Now!">
    </form>
    <hr>
    </body>
    </html>
    ========== Calling HTML File END ======
    =========================================================
    Since, the descriptors were automatically generated, I have not included them here. Also, I did not build the war, jar, ear files myself, they were automatically generated by the deploytool.
    Please help!!
    Thanks & Bye,
    Tualha Khan

    Hey,
    This was the latest code snippet which I used in the Servlet file.
    ========================
    try
              System.out.println("Servlet Entered");
              response.setContentType("text/html");
              System.out.println("HTML Content Type Set");
              out=response.getWriter();
              System.out.println("PrintWriter Object Created");
              InitialContext initial=new InitialContext();
              System.out.println("Context Object Created");
              Object objref=initial.lookup("DisplayWEBJNDI");
              System.out.println("Lookup Done Successfully");
              DisplayHome home=(DisplayHome)PortableRemoteObject.narrow(objref, DisplayHome.class);
              System.out.println("Home Object Created");
              Display ref=home.create();
              System.out.println("Remote Object Created");
              out.println("<html><title>The Results Page</title>");
              out.println("<body<hr>");
              out.println("<h1>The Client Side Response is: ");
              out.println(ref.display());
              out.println("</h1>");
              out.println("<hr>");
              out.println("</body></html>");
              System.out.println("Responses Done");
              out.flush();
              System.out.println("Output Stream Flushed");
              ref.remove();
              System.out.println("Remote Object Removed");
    ========================
    The Response was
    ========================
    Servlet Entered
    HTML Content Type Set
    PrintWriter Object Created
    Context Object Created
    Exception in Servlet Client Code: javax.naming.NameNotFoundException: DisplayWEB
    JNDI not found
    javax.naming.NameNotFoundException: DisplayWEBJNDI not found
    <<no stack trace available>>
    ========================
    So what else should I do???
    Thanks & Waiting,
    Tualha Khan

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