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Using servlet to call EJB and give the response.

 
Arjun Karthick
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Hi all,
I have an EJB application which is exposed as a service to other stand alone services. I have developed that EJB application in the Weblogic container. i have tested the EJB application using a standalone code. Now I have to use a web application that calls the EJB application and displays the result in the JSP.
I have planned to convert the code in the stand alone code to a servlet. Is this approach correct. If correct how do I get assess to various util classes that the standalone code uses.

What are the code change I have to do to my standalone code to act as a servlet?



Regards,
Arjun.
 
Amit M Tank
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Hi Arjun,


You can convert your code to use Servelt so as to invoke an EJB.




props = new Properties(); props.put(Context.PROVIDER_URL, "t3://localhost:7001");props.put(Context.INITIAL_CONTEXT_FACTORY, "weblogic.jndi.WLInitialContextFactory");ctx = new InitialContext(props);obj = ctx.lookup("TestApp");home = (TestHome)javax.rmi.PortableRemoteObject.narrow(obj, TestHome.class);



Have this code in the init() method of the servlet and store the home object in a member variable in the Servlet. [You should have that code in the init method which you want to initialise once and that can be reused by all the clients, please read Servlet specs for this]


Have all other code in your service method.


Now you compile the Servlet and bundle it in a war file. Have all the classes(util classes, stubs, home and remote interface of EJBs) in the WEB-INF/classes folder and all the jars in the WEB-INF/lib of the war. Have proper servlet mapping in the web.xml for the Servlet.

Hope this is what you are looking for in the Servelt.

Cheers,
Amit Tank
 
Arjun Karthick
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Hi Amit,
Thanks for the guidence.
But again I have a doubt. The Ejb Home, remote and stub are part of that EJB application. How can i get the reference of those object. Should i do that by importing that is by adding that jar in the lib folder or by using the web.xml file i can give the reference to the EJB. Please advice on the same.

Regards,
Arjun.
 
Abhilash George
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yes you need to have the client jar file for the created EJBs . At the same time you need to create the reference so as to create an alias so that you can use a local reference for the global jndi so that your code remains safe from changes in global jndi name
 
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