jdom & orbeon

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Jean-Luc,

Our code does not use JDOM (we use dom4j instead, and we are thinking  
about using XOM in the future).

So JDOM must be used by one of the libraries, but I am not sure which  
one.

Try removing it altogether, or upgrading it, and if there are any  
issues please let us know.

-Erik

On Mar 10, 2008, at 1:13 PM, Jean Luc wrote:

> Hello,
>
> I'm investigating a potential library/class loading conflict (when  
> Orbeon is deployed in SAP's WAS) and noticed Orbeon is using JDOM  
> beta9 - that's pretty old (it was released in April 2003). Is there  
> any particular reason it's not using 1.1 final?
>
> Thanks,
> JL

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http://www.orbeon.com/



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I scanned my local copy of your CVS repository, JDOM is used by the saxon
subproject. I replaced the beta9 jar with the latest (1.1) that we use and
the conflict dissapeared.

Weirdly, though, under SAP it seems that Orbeon's libraries take precedence
over the EAR's when called from the EJB app or another WAR (when all are
under the same EAR)! That is, if in my EJB application code I load class Foo
and there is such a class in Orbeon's libraries, that copy is loaded instead
of the one packaged with my application. Just when I finished with JDOM I
stumbled over the next one: commons-fileupload (we use
commons-fileupload-1.2, Orbeon packages commons-fileupload-1.0).

I can't fathom what were they thinking...



----- Original Message -----
From: "Erik Bruchez" <[hidden email]>
To: <[hidden email]>
Sent: Monday, March 10, 2008 5:27 PM
Subject: [ops-users] Re: jdom & orbeon


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On Tue, Mar 11, 2008 at 2:53 PM, Jean Luc <[hidden email]> wrote:
> I scanned my local copy of your CVS repository, JDOM is used by the saxon
>  subproject. I replaced the beta9 jar with the latest (1.1) that we use and
>  the conflict dissapeared.

Would it work if you entirely remove the jdom jar from orbeon.war?

>  Weirdly, though, under SAP it seems that Orbeon's libraries take precedence
>  over the EAR's when called from the EJB app or another WAR (when all are
>  under the same EAR)! That is, if in my EJB application code I load class Foo
>  and there is such a class in Orbeon's libraries, that copy is loaded instead
>  of the one packaged with my application. Just when I finished with JDOM I
>  stumbled over the next one: commons-fileupload (we use
>  commons-fileupload-1.2, Orbeon packages commons-fileupload-1.0).

Interesting. Not that this helps you in this case, but WebLogic does
it the other way around, with one class loader for all your EJBs and
one per web app, which is child of the EJB class loader. See the
figure 4-1 on:

http://edocs.bea.com/wls/docs81/programming/classloading.html

Alex
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Orbeon Forms - Web 2.0 Forms, open-source, for the Enterprise
Orbeon's Blog: http://www.orbeon.com/blog/
Personal Blog: http://avernet.blogspot.com/


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> I scanned my local copy of your CVS repository, JDOM is used by the  
> saxon subproject.

"Used" is relative here: AFAIK Saxon will *support* JDOM, in that it  
is then able to support interfacing with JDOM trees in memory. But by  
default, Saxon should not depend on JDOM any more than it should  
depend on dom4j or XOM.

My guess is that if you just remove the JDOM JAR, Saxon will continue  
working fine.

-Erik

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Orbeon Forms - Web Forms for the Enterprise Done the Right Way
http://www.orbeon.com/



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> Would it work if you entirely remove the jdom jar from orbeon.war?

I'll try today or tomorrow (I'm using a QA server so these changes go in
when a build is deployed).

> Interesting. Not that this helps you in this case, but WebLogic does
> it the other way around, with one class loader for all your EJBs and
> one per web app, which is child of the EJB class loader. See the
> figure 4-1 on:

Yep, that's how a server should behave, hence my surprise.


----- Original Message -----
From: "Alessandro Vernet" <[hidden email]>
To: <[hidden email]>
Sent: Tuesday, March 11, 2008 6:16 PM
Subject: [ops-users] Re: Re: Re: jdom & orbeon


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----- Original Message -----
From: "Alessandro Vernet" <[hidden email]>
> Would it work if you entirely remove the jdom jar from orbeon.war?

yes. it does.




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