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JavaRanch » Java Forums » Certification » EJB Certification (SCBCD/OCPJBCD)
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client locating the enterprise beans..

Giju George
Ranch Hand

Joined: Jun 08, 2004
Posts: 333
How does the client actually locate the enterprise beans?. I know it uses JNDI for lookup.. but no where we specify the machine/IP address of the app server ???


SCJP 1.4, SCWCD 1.4, SCBCD 1.3, SCEA
chandrasekhar muvvala
Greenhorn

Joined: Nov 12, 2003
Posts: 9
There are several ways to do this:

1. u could pass information to the InitialContext constructor (a properties object that contains everything the InitialContext needs to find the server and the starting context).

2. There are several places where JNDI properties can be placed on the client's machine.

In both the cases, the client must be given something - either info for InitialContext constructor, or a properties file. It's different for each vendor's server. pls. check documentation in order to know what the client needs.

The same thing is explained in HFEJB Book.
Giju George
Ranch Hand

Joined: Jun 08, 2004
Posts: 333
Thanx chandra for u'r reply.

Well, what I got after playing around a little bit was :- If your client is outside your container, then you cannot just do a "java:comp/env" lookup. This is ONLY for beans/classes inside the container. So now you have to create your own InitialContext using :-

java.util.Hashtable env = new java.util.Hashtable();
env.put(Context.INITIAL_CONTEXT_FACTORY,
"com.sun.jndi.cosnaming.CNCtxFactory");
env.put(Context.PROVIDER_URL, "corbaloc:iiop:<hostname>:3700");

Context initial = new InitialContext(env);
Object obj = (Object) initial.lookup("/ejb/<bean-jndi-name>");

So, there you specify the machine/ipaddress of the server.

Remember to specify "/ejb" before the jndi name while using lookup.

(just correct me, if I am writing nonsense.... ).
 
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