JNDI Lookup on JBoss AS 6.0

问题:

I have an application deployed at localhost on JBoss 6.0 AS. This application has one remote EJB bean called ExampleEJB. Now I'm trying to code a simple client application that consumes ExampleEJB. This client application will not be deployed at any application server. The idea is to code a simple Java SE client program. I've written the following trying to perform a lookup:

Properties env = new Properties();
env.put(Context.INITIAL_CONTEXT_FACTORY,"org.jnp.interfaces.NamingContextFactory");
env.put(Context.PROVIDER_URL,"localhost:1099");
env.put("java.naming.factory.url.pkgs","org.jboss.naming:org.jnp.interfaces");

InitialContext ic = new InitialContext(env);

At this point, I've tried two approaches The first one was to perform a direct lookup like examplified at Java EE 6 Tutorial (http://docs.oracle.com/javaee/6/tutorial/doc/gipjf.html):

ExampleEJB exampleEJB = (ExampleEJB) ic.lookup("java:global/myApp/ExampleEJB");

The second attempt was to try to get the JNDI context enviroment and then get the desired bean from this enviroment:

Context envContext  = (Context)ic.lookup("java:/comp/env");
envContext.lookup(...)

The problem is that I'm receiving the following exceptions: "javax.naming.NameNotFoundException: global not bound" and "javax.naming.NameNotFoundException: comp not bound" respectively. I'm unable to perform the lookup as desired.

Does someone have a clue?

回答1:

If you are using java:global/, then the JNDI name should look like this:

java:global/<application>/<module>/<component>

or

java:global/<ear>/<ejb-jar>/<ejb-name>

where ear is the name of the .ear file, and ejb-jar the name of the EJB .jar file.

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If you have both a local and a remote interface, you can differ using this scheme:

java:global/<ear>/<ejb-jar>/<ejb-name>!<interface>

where the interface contains the package and the interface name (example: a.b.c.ExampleEJBRemoteIfc).

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So in your setup: If myApp.ear contains myEjb.jar which contains an EJB whose name is ExampleEJB, then try this JNDI name:

java:global/myApp/myEjb/ExampleEJB

or

java:global/myApp/myEjb/ExampleEJB!a.b.c.ExampleEJBRemoteIfc

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Anyway, double check the JNDI name(s) in the JMX console:

http://localhost:8080/jmx-console/

1. Click Service=JNDIView
2. Operation list: Click invoke button
3. Search in that page by the EJB name

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As for comp/env vs. global: What is the relationship between java:comp/env and java:global

回答2:

Ok, I've solved my problem. I've discovered that it is possible to visualize JNDI tree on JBoss by accessing JBoss JMX Management Console (default location at localhost:8080/jmx-console/). Find JNDIView service and invoke list method. By visualizing the JNDI tree I discovered that I was looking for the wrong location. JBoss registered my EJB at:

+- ExampleEar (class: org.jnp.interfaces.NamingContext)
  |   +- ExampleEJBImpl (class: org.jnp.interfaces.NamingContext)
  |   |   +- remote-br.exemplo.ejb.ExampleEJB (class: Proxy for: br.example.ejb.ExampleEJB)
  |   |   +- remote (class: Proxy for: br.example.ejb.ExampleEJB)

I just modified my code to perform the lookup at:

ExampleEJB exampleEJB = (ExampleEJB) ic.lookup("ExampleEar/ExampleEJBImpl/remote");

and everything went fine.