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jndi basics

hi experts

have this question

In ejbs, the client program (which is trying to access an ejb) has the jndi lookup which goes like this

InitialContext ic = new InitialContext()
Object obj = ic.lookup("blabla");
StudentHome home =(StudentHome) PortableRemoteObject.narrow(blabla,StudentHome.class);
StudentRemote remote= home.create();

my question is ,
I know jndi is used to look up different resources, but what exactly does jndi look up in the above statement.
i want to know how exactly jndi ( in above program) communicates with the component deployed in the server.

thanks

J

ASKER CERTIFIED SOLUTION

Mick Barry

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jaggernat

ASKER

ok , but where is "blabla" in the component. Is it the HomeInterface or is it the RemoteInterface or anything else.

thanks for prompt response,
J

Mick Barry

It could be anything

the following should help

http://java.sun.com/products/jndi/tutorial/

jaggernat

ASKER

thats a huge tutorial . ok , how is jndi related to homeinterface or remote interface that we create in the ejb component .

thanks,
J

Mick Barry

jndi is the lookup mechanism used to locate the required objects

http://java.sun.com/products/jndi/tutorial/getStarted/examples/naming.html

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Javatm

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jaggernat

ASKER

so ejb/com/package/HelloHome is the jndi name of ejb class. right

Mick Barry

> Object obj = prop.lookup("ejb/com/package/HelloHome");

that should be the following shouldn't it?

Object obj = prop.lookup("java:comp/ejb/com/package/HelloHome");

if you are more intested in EJB as opposed to JNDI then theres an example here:

http://publib.boulder.ibm.com/infocenter/ws60help/index.jsp?topic=/com.ibm.websphere.nd.doc/info/ae/ae/rnam_example_prop3.html

Mayank S

>> that should be the following shouldn't it?

It could be anything, depending upon the server. For example, in Websphere, you could perform look-up on "WFInd.MaintenanceService" where WFInd.MaintenanceService is defined in ibm-ejb-jar-bnd.xmi as:

<ejbBindings xmi:id="MaintenanceService_Bnd" jndiName="WFInd.MaintenanceService">
<enterpriseBean xmi:type="ejb:Session" href="META-INF/ejb-jar.xml#MaintenanceService"/>
</ejbBindings>

This would search for <ejb-name>MaintenanceService</ejb-name> in ejb-jar.xml.

Javatm

> so ejb/com/package/HelloHome is the jndi name of ejb class. right

Yes thats correct =)