Problem with an Example

Fri, 06 Jul 2001 15:02:10 -0700

Hello,

I new to J2EE applications and the Orion server.  I found a nice example on the web ( http://www.4degreez.com/intro_part_1.html ) that shows how to setup a J2EE application on Orion using the JDK tools.  However, when I deploy the application and test it, I get the following error:

java.lang.NullPointerException
        at /index.jsp._jspService/(/index.jsp.java:59) (JSP page line 38)
        at com.orionserver[Orion/1.5.2 (build 10460)].http.OrionHttpJspPage.service(Unknown Source)
        at com.evermind[Orion/1.5.2 (build 10460)]._ah._rad(Unknown Source)
        at com.evermind[Orion/1.5.2 (build 10460)].server.http.JSPServlet.service(Unknown Source)
        at com.evermind[Orion/1.5.2 (build 10460)]._cxb._abe(Unknown Source)
        at com.evermind[Orion/1.5.2 (build 10460)]._cxb._uec(Unknown Source)
        at com.evermind[Orion/1.5.2 (build 10460)]._io._twc(Unknown Source)
        at com.evermind[Orion/1.5.2 (build 10460)]._io._gc(Unknown Source)
        at com.evermind[Orion/1.5.2 (build 10460)]._if.run(Unknown Source)


Here is the code for the remote interface:

package orionapp.beans.Info;

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

public interface Info extends EJBObject
{
    public String getMessage(String name) throws RemoteException;
}

Here is the code for the home interface:
package orionapp.beans.Info;

import javax.ejb.*;
import java.io.Serializable;
import java.rmi.RemoteException;

public interface InfoHome extends EJBHome
{
    public Info create() throws CreateException, RemoteException;
}
 

Here is the code for the bean:
package orionapp.beans.Info;

import java.rmi.RemoteException;
import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import javax.naming.InitialContext;

public class InfoBean implements SessionBean
{
    public String getMessage(String name)
    {
        String rtn = "Hello" + name + "!";
        return rtn;
    }
 
 public void ejbCreate() { }
 public void setSessionContext(SessionContext ctx) { }
 public void ejbRemove() { }
 public void ejbActivate() { }
 public void ejbPassivate() { }
 public void ejbLoad() { }
 public void ejbStore() { }

}

Here is the code for the JSP:
<%@ page import="
 javax.naming.*,
 javax.ejb.*,
 java.rmi.*,
 javax.rmi.PortableRemoteObject,
 orionapp.beans.Info.*"
%>

<HTML><HEAD><TITLE>Test</TITLE></HEAD>
<BODY>

<%
 // variables for the Info bean
 InfoHome iHome = null;
 Info   iBean = null;
 
 // check for form data
 String  name = request.getParameter("txtName");
 
 // variable for String returned from Info bean
 String  msg  = null;
 
 // if form data was submitted...
 if (name != null)
 {
      try
      {
           InitialContext ctx = new InitialContext();
           iHome = (InfoHome)PortableRemoteObject.narrow(ctx.lookup("java:comp/env/ejb/orionapp/beans/Info"),
                        InfoHome.class);
           iBean = iHome.create();
      }
      catch (Exception e)
      {
       e.printStackTrace();
      }
 
      msg = iBean.getMessage(name);  // THIS IS THE LINE INDICATED BY THE ERROR MESSAGE!!!
%>

Here is your message: <%= msg %>

<%
     } // end if (name != null)
     else
     {
%>
  <FORM METHOD="get" ACTION="index.jsp">
  <BR>Enter your name: <INPUT TYPE="text" name="txtName"<BR>
  <INPUT TYPE="submit" value="Submit"><BR>
  </FORM>
 
<%
     } // end else
%>

</BODY></HTML>

It looks like iBean is still null, but why?

Thanks in advance,

Mo

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