JNDI on AS400

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Hi,
I'm trying to configure Tomcat to use UDBDConnectionPoolDataSource as statement 
pooled connection factory and can't get JNDI to work.
Before run it under Tomcat I want to make sure that JNDI portion of the code 
would work. The code is:




import java.sql.*;
import javax.naming.*;
import java.util.*;
import com.ibm.db2.jdbc.app.UDBDataSource;


public class UDBDataSourceExample1
{
    public static void main(java.lang.String[] args)
    throws Exception
    {
        UDBDataSource ds = new UDBDataSource();
        ds.setDescription("Basic DataSource");
        System.out.println("dataSource created");


        Context ctx = new InitialContext();


        ctx.rebind("BaseDataSource", ds);
    }
}

Error message when trying to rebind: javax.naming.NoInitialContextException:
Need to specify class name in environment or system property, or as an applet 
parameter, or in an application resource file:  java.naming.factory.initial
....

and if I'm running the same code with initial context set as:

import java.sql.*;
import javax.naming.*;
import java.util.*;
import com.ibm.db2.jdbc.app.UDBDataSource;
public class UDBDataSourceExample1
{
    public static void main(java.lang.String[] args)
    throws Exception
    {
        UDBDataSource ds = new UDBDataSource();
        ds.setDescription("Basic DataSource");
        System.out.println("dataSource created");
        Hashtable env = new Hashtable();
        env.put(Context.INITIAL_CONTEXT_FACTORY,
                "com.sun.jndi.fscontext.RefFSContextFactory");
        env.put(Context.PROVIDER_URL, "file:/jdbc/DataSources");
        System.out.println("envelope created");

        // Establish a JNDI context.
        Context ctx = new InitialContext(env);
        System.out.println("Context created");
        ctx.rebind("BaseDataSource", ds);
    }
}
javax.naming.NameNotFoundException; remaining name '"/jdbc/DataSources"'
      java/lang/Throwable.<init>()V+4 (Throwable.java:78)
      java/lang/Exception.<init>()V+1 (Exception.java:29)
      javax/naming/NamingException.<init>()V+1 (NamingException.java:112)
      javax/naming/NameNotFoundException.<init>()V+1 
(NameNotFoundException.java 44...

We are running V5R1 with all latest PTF installed and I run second example with 
fscontext.jar included in class path

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