permanently NullpointerException when call entity bean
Hi
After i had permanently this problems i try it with another description in this forum.Maybe i get feedbck.....
Problem 1:
I use sample database 搒ample?coming with the application server (jdbc:derby:sample) and code from the tutorials. I can map the database as entity, create persistent unit, create session beans but when i call a servlet or jsp class to
retrieve data form database mapped on entity bean i become ever NullpointerException.!
I work on win xp system and thought maybe this problem depends on my user setting on my user directory where i see two directories:
C:\Document and Setting\me\.netbeans-derby
C:\Document and Setting\me\.netbeans\5.5
!!?
now Problem 2:
Now i create an ejb module with an entity bean and persistent unit, a session bean and a java class in the ejb module and try to see what happen here....
So i become now this error:
javax.naming.NoInitialContextException: Need to specify class name in environment or system property, or as an applet parameter
!!?
How could i test if in jndi there are entries for this component?
here is my class which calls the session bean :
package client;
import ejb3.Manufacturer;
import ejb3.ManufacturerFacadeLocal;
import java.util.Collection;
import java.util.Iterator;
import java.util.logging.Level;
import java.util.logging.Logger;
import javax.naming.Context;
import javax.naming.InitialContext;
import javax.naming.NamingException;
public class client {
ManufacturerFacadeLocal mfl = null;
public client() {
mfl = lookupManufacturerFacade();
}
public void readData()
{
Collection all = mfl.findAll();
Iterator it = all.iterator();
while (it.hasNext())
{
Manufacturer mf = (Manufacturer)it.next();
System.out.println(mf.getManufacturerId());
}
}
private ManufacturerFacadeLocal lookupManufacturerFacade() {
try {
Context c = new InitialContext();
return (ManufacturerFacadeLocal)c.lookup("java:comp/env/ejb/ManufacturerFacade");
}
catch(NamingException ne) {
Logger.getLogger(getClass().getName()).log(Level.SEVERE,"exception caught" ,ne);
throw new RuntimeException(ne);
}
}
public static void main( String[] args )
{
client ec = new client();
ec.readData();
}
}
I will be very thankful for any help
thank you
