Cant resolve ejb-local-ref

Question

Hi!
Im a novice at this environment so I have been running the EJB Tutorial provided
with 8.1
Everything works as i should until I deploy the application.
I get a:
weblogic.management.DeploymentException: Could not setup environment - with nest
ed exception:
[weblogic.deployment.EnvironmentException: [J2EE:160101]Error: The ejb-link 'Ban
dsExampleEJB.jar#Music' declared in the ejb-ref or ejb-local-ref 'ejb/MusicLink'
in the application module 'webapp' could not be resolved. The target EJB for
th
e ejb-ref could not be found. Please ensure the link is correct.]
The code for the ejb-local-ref is as folows:
<ejb-local-ref>
<ejb-ref-name>ejb/MusicLink</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home>examples.ejb20.relationships.bands.MusicHome</local-home>
<local>examples.ejb20.relationships.bands.Music</local>
<ejb-link>BandsExampleEJB.jar#Music</ejb-link>
</ejb-local-ref>
What can I be doing wrong?
/Peter

Answer 1

Gunnar,
There are a few mistakes in the tutorial that will
be fixed for the upcoming SP2 release. As far as the tutorial code
itself goes I've reproduced this problem by following the tutorial
exactly as its stated and there's a couple of things that can be
what's causing all the problems for you and others.
The easiest solution is to use the supplied MusicBean source that's
supplied with the tutorial. That bean code is correct and functional.
The tutorial is missing some of the steps required to reproduce that
exact bean code.
I'll cover all the errors I found. One of these is quite possibly what's
tripping you and others up.
1) The getBands() and addBand() method should be made to be local
methods instead of remote methods.
So in step 4 after you've created these methods change the interface
exposure
to be local either directly in the source by changing the tag, or in the
design view
by right clicking the method and selecting "local". This will show the
methods
with a yellow diamond next to them in the design view.
You also need to enable local interfaces as well as update the local
interface and local home interface.
To do this:
1) switch to the design view
2) click on the EJB
3) find the "naming" node in the property editor and uncheck "Remote EJB"
4) check the "Local EJB" checkbox which will then enable the fields for
the local and local home interfaces
5) enter the value of local interface to be: "Music"
6) enter the value of local home interface to be: "MusicHome"
2) The setup datasource step is incorrect in the tutorial.
The entity beans that are imported use a datasource called
"examples-dataSource-demoPool".
This datasource doesn't exist in the default workshop domain so in this step
the user
is to create the missing datasource. So going to the datasource viewer and
choosing "add datasource"
and pasting in the above name will create the datasource that's needed for
the entity beans.
3) In the source code listing for MusicBean there's missing imports for:
javax.naming.InitialContext
javax.naming.NamingException
4) the ejb-local-ref XML has one problem, possibly two:
1) The case is incorrect for the EJB ref name. The tutorial has it as:
ejb/MusicLink
but addBand.jsp refers to it as ejb/musicLink. So either change the
jsp file or the ejb-ref-name so
that the two match.
2) The placement of the <ejb-local-ref> XML may be in the wrong spot.
This element must
appear at the bottom of web.xml. i.e.
<webapp>
<ejb-local-ref>
<ejb-ref-name>ejb/musicLink</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home>examples.ejb20.relationships.bands.MusicHome</local-home>
<local>examples.ejb20.relationships.bands.Music</local>
<ejb-link>BandsExampleEJB.jar#Music</ejb-link>
</ejb-local-ref>
</web-app>
5) and finally ensure that your application's build order is correct. Make
sure that the EJB
project builds before the web project.
This can be verified by selecting the menu "tools->application properties"
and then
clicking on the "build" node to get the build order.
All of these mistakes will be fixed for the SP02 release. Hopefully one of
these solutions fixes
the problems you're experiencing.
-Michael
"Gunnar Skogen" <[email protected]> wrote in message
news:[email protected]...
>
This thread :
Suggestions on newbie tutorials for Workshop and Weblogic 8.1
Date: 8 Aug 2003 15:06:55 -0700
From: "Morgan" <[email protected]>
Organization: BEA NEWS SITE
Newsgroup: weblogic.developer.interest.workshop
Describes the same problem, no solution - so:
1) When will the tutorial(s)/ and or workshop be fixed ?
2) Could we get a fix for this particular problem ? ( I tried more than Iwant
to admit )
"Gunnar Skogen" <[email protected]> wrote:
Hi,
(chiming in because:)
I have exactly the same problem with the same app:
This is following the tutorial for 8.1 :"Tutorial EJB project, Part one"
to the
letter and running the build.
The link names etc are correct, however, nothing is/has been deployed
according
to console..
NB: Following the tutorial the MusicBean is set up as a remote bean
(default
in
workshop?) - have tried going the local way also without any success.
It appears
the tutorial itself is faulty(?) ( it also shows the dialog for importing
a webapp
when it most probably means to create an empty one )
Michael Kovacs <[email protected]> wrote:
Hi Peter,
A couple of things...
Ensure that your EJBs are deployed to the server properly. It
seems from your error that they might very well already be
deployed successfully, but that's just a guess. To verify this you
can have a look at the WebLogic admin console and see that your
beans have been deployed to the server by looking at your
application.
Assuming your beans are deployed....
Ensure that the reference to the EJB ref is using the exact
name of the ejb-ref-name. The name is case sensitive.
So when you do your lookup of the bean in your JSP
ensure that the "ejb/MusicLink" from the <ejb-ref-name>
matches exactly. i.e.
Object obj = ctx.lookup("java:comp/env/ejb/MusicLink");
Also, make sure that the <ejb-link> is correct.
The format for the link name is:
EJBprojectname.jar#EJBName
So for your example, make sure that "BandsExampleEJB"
is the name of your EJB project or correct that value in the
link name, and that your Bean's EJB name is "Music".
Let me know if this helps.
-Michael
Peter Hegedüs wrote:
Hi!
Im a novice at this environment so I have been running the EJB
Tutorial
provided
with 8.1
Everything works as i should until I deploy the application.
I get a:
weblogic.management.DeploymentException: Could not setup environment- with nest
ed exception:
[weblogic.deployment.EnvironmentException: [J2EE:160101]Error: Theejb-link 'Ban
dsExampleEJB.jar#Music' declared in the ejb-ref or ejb-local-ref
'ejb/MusicLink'
in the application module 'webapp' could not be resolved. The targetEJB for
th
e ejb-ref could not be found. Please ensure the link is correct.]
The code for the ejb-local-ref is as folows:
<ejb-local-ref>
<ejb-ref-name>ejb/MusicLink</ejb-ref-name>
<ejb-ref-type>Session</ejb-ref-type>
<local-home>examples.ejb20.relationships.bands.MusicHome</local-home>
<local>examples.ejb20.relationships.bands.Music</local>
<ejb-link>BandsExampleEJB.jar#Music</ejb-link>
</ejb-local-ref>
What can I be doing wrong?
/Peter