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From "Peter H (JIRA)" <>
Subject [jira] Commented: (GERONIMO-556) Optional resource refs
Date Mon, 11 Jan 2010 14:32:56 GMT


Peter H commented on GERONIMO-556:

Actually it would be great if also gbean-ref in geronimo-web.xml etc would be able to match
to resource-ref in web.xml etc.

Have the following example with Work Manager and the explanation below:

web.xml entry


geronimo-web.xml entry:


Then have the application externally configurable regarding the current implementation of
WorkManager to be used
- on WAS/WLS set it to commonj - everything's fine
- on JBossAs (which can live invalid resource-ref entry so no problem with deploy) set it
to JBoss JCA WorkManager implementation and use that - everything's fine except that the resource-ref
isn't valid but as I wrote JBoss doesn't have much troubles with that
- on Geronimo (which is currently unable to deploy the same ear/war) set it to Geronimo's
JCA WorkManager and uyse that - everything would be fine if. one of the following would be

1. gbean-ref in geronimo-web.xml would match the resource-ref in web.xml, overriding the ref-type
from web.xml and pointing to the desired gbean, then we would lookup the mapped component
and use it properly (by externally configuring application to use the JCA WorkManager instead
of CommonJ)

2. the resource-ref in web.xml (which is incorrect on Geronimo) would be ignored completely,
application would deploy with that, via gbean-ref in geronimo-web.xml we would make the desired
gbean accessible via JNDI and by externally configuring the app to use JCA WorkManager we
would access it

3. we would add a resource-ref to geronimo-web.xml pointing to a WorkManager explicitly exposed
via JNDI (which is fortunately possible) and that would match the resource-ref in web.xml,
overriding the ref-type again, with configuration setup for different case it should also
work fine

4. the incorrect resource-ref in web.xml would be just ignored on Geronimo, we would expose
the desired WorkManager via JNDI and access it directly via JNDI lookup without anything special
in geronimo-web.xml

I think the first option would be the best, but others are also viable.

I'll leave this issue for couple of days and if there will be no activity I'll probably open
a duplicate of this (this one is closed and I can't reopen it) with these proposals.

The whole thing about which all this is is to make an application deployable on various application
servers without the need to modify the actual ear/war file.

> Optional resource refs
> ----------------------
>                 Key: GERONIMO-556
>                 URL:
>             Project: Geronimo
>          Issue Type: New Feature
>          Components: deployment
>            Reporter: David Jencks
>            Assignee: David Jencks
>             Fix For: Wish List
> Right now, all resource refs (and other jndi entries) specified in a spec-dd must be
resolved during deployment or building the configuration will fail.  It's possible that some
resource refs are optional and that the app can function to  some extent with them missing.
> We could support this by including an optional "optional" marker in the geronimo plan.
The simplest implementation would attempt to resolve the ref to an object name present during
deployment, and use it if the name is found, and bind nothing if the name is not found.  Then
the app would get a naming exception at runtime if it tried to look up the missing resource.
> We should decide what should happen when the entire target object name is supplied. 
We could use it to bind a reference, or only bind a reference if the gbean is present at deploy-time.

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