Disambiguating two EJBs in an .ear file

From: Laird Nelson <ljnelson_at_gmail.com>
Date: Fri, 21 Jun 2013 09:29:04 -0700

I'd like to confirm that the following general approach is the right one
(before I start digging into GlassFish errors :-)):

I have a SLSB (of class foo.XBean with no explicitly assigned bean name, so
its bean name is defaulted to "XBean"). XBean implements a @Local
interface, X (in case it matters).

It has this in it:

@EJB
private Y y;

Standard stuff.

Y in this case is a @Local interface of another SLSB, foo.YBean, of type
@Local Y, packaged in the same .ear file.

Deployment obviously works fine.

Now suppose I add another Y implementor to the ear file: foo.UnwantedYBean.
This is also, let's say, a @Local implementation of Y.

So two @Local Y implementations in the same .ear file and in the case of
XBean no way to distinguish them. Oops.

Obviously and appropriately deployment fails.

So now I want to make it so that my EJB named XBean injects a foo.YBean
proxy into its y field so that deployment will be happy again. Let's say I
can't do this in the annotations.

Is the following deployment descriptor XML (located obviously in XBean's
ejb jar file, in the META-INF directory--no tricks) supposed to do this?
I've tried to simply duplicate the example on page 448 of the EJB 3.1
specification, but using <ejb-local-ref> instead of <ejb-ref>.

<?xml version="1.0" ?> <ejb-jar xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="
http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/ejb-jar_3_1.xsd" version="3.1">
<enterprise-beans>
  <session>

    
    <ejb-name>XBean</ejb-name>

      <ejb-local-ref>

        
        <ejb-ref-name>XBean/y</ejb-ref-name>

        
        <ejb-link>YBean</ejb-link>

      </ejb-local-ref>
    </session>
  </enterprise-beans>
</ejb-jar>

For some reason, I've always had trouble parsing the EJB specification on
this point.

Thanks,
Laird

-- 
http://about.me/lairdnelson