9:17 p.m.
On Jan 29, 2014, at 2:11 PM, Scott Marlow <smarlow(a)redhat.com> wrote:
On 01/29/2014 02:44 PM, David M. Lloyd wrote:
> On 01/29/2014 01:39 PM, Klein, Christopher wrote:
>> Hey guys,
>> I already filled out a feature request in JIRA
(https://issues.jboss.org/browse/WFLY-2816).
>>
>> We have the situation that our development environment (currently JBoss AS 7.1.1)
differs from the production instance (WebSphere 8.5). Our persistence.xml has to be
adjusted for production environment: different jta-data-source, different properties. The
dirty solution for this problem would be to generate separate build artifacts for both
environments. As you can imagine I don't like the idea of having two binaries just
because of a few different settings. Other options (WildFly or WebSphere specific JPA
properties; extending Hibernate persistence provider) do not work.
>>
>> A much nicer solution would be: WildFly checks on deployment process for the
existence of a jboss-persistence.xml. If it does, the jboss-persistence.xml is used for
configuring the JPA subsystem. Otherwise it falls back to the standard persistence.xml.
The jboss-persistence.xml would use the XML schema from persistence.xml.
>>
>> I lookup into the WildFly sources and this change should be an easy patch which I
would provide.
>>
>> So here are my questsions:
>> 1. Are you generally interested in accepting such a pull request or is it a
feature you don't want?
>> 2. Does another solution exists to my problem apart from generating different
artifacts which makes this pull request needless?
>
> It sounds like a reasonable idea that actually applies generally. If I
> recall correctly, we have something of a mix today of descriptors which
> override versus supplementing existing configuration. But overall the
> unofficial policy for new descriptors has been to add them in to
> jboss-all.xml as subdescriptors, FWIW.
>
I'm not sure that jboss-all.xml would be a good place for the
persistence unit definitions.
I would agree that this is probably impractical.
I think that the proposed jboss-persistence.xml (or
wildfly-persistence.xml) could be helpful for anyone that wants to only
develop on WildFly but deploy on other application servers. I suppose
this could help someone that wants to migrate off of WildFly as well (to
prepare for a switch to something else). Is that what you mean by the
proposed solution applying generally?
It does sound a lot like a vendor specific alt-dd feature. We have some other solutions as
well that might be relevant:
1) Deployment overlay feature - This allows you to override the descriptors in a
deployment without modifying the deployment. These are added in a separate management op
with a match pattern, and preserved outside the lifecycle of the deployment. Available in
WildFly 8 and EAP 6.2 (can’t recall if it made EAP 6.1).
2) Property Substituion - There is a flag you can optionally enable in
standalone/domain.xml that allows descriptors to contain property expressions. However,
this only works for this use case if all venders are using the same expression language
(unlikely). I just thought I would mention it.
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Jason T. Greene
WildFly Lead / JBoss EAP Platform Architect
JBoss, a division of Red Hat