I am running tomcat and JBoss separately. And I would
like to access an ejb from a servlet just as my client
application did.
I tried the ejb interest example and it worked just
fine.
The client application was able to communicated with a
remote ejb. I modified this client application into a
servlet and complied it just fine.
During execution, the servlet throws the exception
below. Sure JBoss was running as I did successfully
run the usual client application.
Then copied the jbosssx-client.jar,jboss-client.jar,
jnp-client.jar and even the jaas.jar and ejb.jar files
into tomcats lib directory, but the error persisted
(even after restarting tomcat).
Error javax.naming.NoInitialContextException: Cannot
instantiate class:
org.jnp.interfaces.NamingContextFactory [Root
exception is java.lang.ClassNotFoundException:
org.jnp.interfaces.NamingContextFactory]
The servlet looks like this.
(see attachment).
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package com.burudani.interest;
import java.util.Properties;
import javax.rmi.PortableRemoteObject;
import javax.naming.*;
import com.burudani.interest.Interest;
import com.burudani.interest.InterestHome;
import java.io.*;
import java.text.*;
import java.util.*;
import javax.servlet.http.*;
import javax.servlet.*;
public class InterestClientServlet extends HttpServlet
{
private void executeServer(String JavaNamingProviderURLValue,String
JndiContextLookupValue,PrintWriter out)
{
out.println("inside executeServer()");
String JavaNamingProviderURL="localhost:1099";
String JndiContextLookup="Interest";
Date ServerDate=new Date();
SimpleDateFormat sdf;
sdf=new SimpleDateFormat("dd MMM yyyy hh:mm:ss:ms zzz");
try
{
/*System.out.println("Set the
\"java.naming.provider.url\"");
BufferedReader br=new BufferedReader (new
InputStreamReader(System.in));
String str="";int i;
for (i=0;i<1;i++)
str=br.readLine();
JavaNamingProviderURL=str;
System.out.println("Enter the lookup jndi Name of
remote object");
br=new BufferedReader (new
InputStreamReader(System.in));
for (i=0;i<1;i++)
str=br.readLine();
*/
JavaNamingProviderURL=JavaNamingProviderURLValue;
JndiContextLookup=JndiContextLookupValue;
out.println("Setting the
\"java.naming.provider.url\"");
out.println(JavaNamingProviderURL);
out.println("Setting the lookup jndi Name of remote
object");
out.println(JndiContextLookup);
}
catch(Exception ioe)
{
System.out.println("Problems reading your values
"+ioe.toString());
}
//set up the naming provider, this may not be necessary,
depending on how your Java system is configured.
Properties env=new Properties();
env.setProperty("java.naming.factory.initial","org.jnp.interfaces.NamingContextFactory");
//env.setProperty("java.naming.provider.url","localhost:1099");
env.setProperty("java.naming.provider.url",JavaNamingProviderURL);
env.setProperty("java.naming.factory.url.pkgs","org.jboss.naming");
try
{
InitialContext jndiContext=new InitialContext(env);
out.println("Got context");
//Object ref=jndiContext.lookup("Interest");
Object ref=jndiContext.lookup(JndiContextLookup);
out.println("Got Reference");
//Get a reference from this to the Bean's Home
interface.
InterestHome
home=(InterestHome)PortableRemoteObject.narrow(ref,InterestHome.class);
//Create an Interest Object using the Home Interface
Interest interest=home.create();
ServerDate=interest.getServerDate();
System.out.println("Server date is
"+sdf.format(ServerDate));
//Now call the calculateCompoundInterest() method to
do the interest calculation.
System.out.println("Interest on 1000 units, at 10% per
period, compounded over 2 periods is: ");
System.out.println(interest.calculateCompoundInterest(1000,0.10,2));
ServerDate=interest.getServerDate();
System.out.println("Server date is
"+sdf.format(ServerDate));
}
catch(Exception re){System.out.println("Error
"+re.toString());}
/*catch(javax.naming.NamingException
ne){System.out.println("NamingException Error "+ne.toString());}
catch(java.ejb.CreateException
ce){System.out.println("java.ejb.CreateException Error "+ce;}
catch(java.ejb.FinderException
fe){System.out.println("java.ejb.FinderException Error "+fe;}
*/
}
public void doGet(HttpServletRequest req,HttpServletResponse res)
throws ServletException, IOException
{
PrintWriter out=res.getWriter();
out.println("there");
executeServer("132.107.151.36","ejb/Interest",out); //just
hardcode values for testing purposes.
}
}
