How to call a Session Bean from a servlet?

[Priya Sri]

Hi friends,
I am a new learner of EJB's. I want to develop an application which is like this..

JSP ---> Servlet----->EJB

Can u please guide me how to call a session bean from a servlet?

Thanks,
Priya Sri.

[Dave Clark]

You'd probably be better off with

Servlet (front Controller) --> Session Bean --> back to Servlet --> forward to JSP

and you'd be better off still if you just use JavaServer Faces rather than Servlets and JSPs alone.

For code examples, it sounds like you need to get yourself a good J2EE book. Try

http://www.oreilly.com/catalog/entjbeans4/
http://www.oreilly.com/catalog/jsvrfaces/ and
http://www.oreilly.com/catalog/jvadtaobj/

cheers,

Dave

[Valentin Tanase]

This is a very simple task. It looks almost identical with the way any client calls the bean, with couple of differences only:

When you build the initial context, you don�t need to set the environment, because your code runs on the server and it is already set.

You can "cast" rather then "narrowing" to get a reference to the bean�s local interface.

Your code will look like this:

InitialContext initCtx = new InitialContext();
MyBeanLocalHome home = (MyBeanLocalHome)initCtx.lookup("java:comp/env/ejb/MyBeanJndiName");

One more thing: this is the best approach. However you can access your bean through the remote interface, if the bean and the servlet doesn�t share the same classloader.
Regards.