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EJB Stand alone Client
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L Goundalkar
Ranch Hand
Joined: Jul 05, 2001
Posts: 395
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Hi All,
In a web client the EJB's are accessed through the HTTP protocol which works on TCP/IP connection.
When I have Standalone client, what is the connection protocol which is used to get the access to EJB on application Server.
Thanks.
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L Goundalkar
lggoundalkar@hotmail.com
Sun Certified Programmer for Java 2 Platform
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<b>L G Goundalkar</b><br /> <a href="mailto:lggoundalkar@yahoo.com" rel="nofollow">lggoundalkar@yahoo.com</a> <br />Sun Certified Programmer for Java 2 Platform.<br />Sun Certified Web Component Developer for J2EE.
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Kyle Brown
author
Ranch Hand
Joined: Aug 10, 2001
Posts: 3878
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EJB's are always accessed through the RMI/IIOP protocol regardless of whether or not the client is a servlet, a JSP or a Java application. Some application servers (Weblogic) support a proprietary, non-standard RMI protocol (T3) but the spec mandates RMI over IIOP.
Kyle
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Kyle Brown,
Author of Enterprise Java (tm) Programming with IBM Websphere
See my homepage at http://members.aol.com/kgb1001001 for other WebSphere information.
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Kyle Brown, Author of Persistence in the Enterprise and Enterprise Java Programming with IBM Websphere, 2nd Edition
See my homepage at http://www.kyle-brown.com/ for other WebSphere information.
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L Goundalkar
Ranch Hand
Joined: Jul 05, 2001
Posts: 395
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Hi kyle,
I didn't know that.
I thought in browser client, the request to EJB is through HTTP.
Can you please explain your answer a bit.
Also since IIOP is a communication protocol, on what does it connect the server. I mean does it use TCP/IP as the connection protocol? ( Like HTTP ).
Thanks.
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L Goundalkar
lggoundalkar@hotmail.com
Sun Certified Programmer for Java 2 Platform
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Kyle Brown
author
Ranch Hand
Joined: Aug 10, 2001
Posts: 3878
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Browsers can't connect directly to EJB's. Browsers can only connect to JSP's and Servlets since they only use the HTTP protocol. If you want to build a browser-accessible front end to an EJB you must build a Servlet or JSP and then connect to the EJB from there.
IIOP is a standard protocol from the OMG (It's the Internet Inter-ORB protocol). It's based on TCP.
Kyle
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Kyle Brown,
Author of Enterprise Java (tm) Programming with IBM Websphere
See my homepage at http://members.aol.com/kgb1001001 for other WebSphere information.
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L Goundalkar
Ranch Hand
Joined: Jul 05, 2001
Posts: 395
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Thanks Kyle.
But one last question 
please tell me how this scenario works :
I have a standalone client on a Machine A and the J2EE server on machine B. Now How to connect to the EJBs on the Machine B to access the EJBs. Since we have to use RMI/IIOP as communication protocol. So what is the connection protocol. Is it TCP / IP ??
If its so then how to do it. ?
Thanks for the time.
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L Goundalkar
lggoundalkar@hotmail.com
Sun Certified Programmer for Java 2 Platform
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Kyle Brown
author
Ranch Hand
Joined: Aug 10, 2001
Posts: 3878
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The EJB client stubs know how to connect to the server using RMI/IIOP. You don't have to do anything special. You just write your program using the EJB client API's and it all happens for you.
I suggest you get Richard Monson-Haefel's "Enterprise JavaBeans" book and read through it. It explains this in more detail. Another suggestion is to read the EJB specification, which should also help.
Kyle
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Kyle Brown,
Author of Enterprise Java (tm) Programming with IBM Websphere
See my homepage at http://members.aol.com/kgb1001001 for other WebSphere information.
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subject: EJB Stand alone Client
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