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From "Alexander Sack" <pisym...@gmail.com>
Subject Re: iBatis within EAR files
Date Fri, 07 Apr 2006 20:39:59 GMT
Thanks Jeff a lot.  Yea, your absolutely correct about J2EE classloading
which IMO is a wreck in the specification (it should be well understood and
analgous across app servers).

Yeah, this all started when I turned on EAR isolation on.  I'm going to
explore EAR isoloation and java2Parent delegation in JBoss.  There are
Twiki's that explain it but I'm finding it still mysterious.

You know all the examples of iBatis and J2EE involve WARs where WEB-INF/lib
and classloading is alittle bit more understood.

The fact that I understand the issue makes me feel a little better...


On 4/7/06, Jeff Butler <jeffgbutler@gmail.com> wrote:
> Well, I'm thinking that there is some misunderstanding on one of our
> parts.  The "bottom line" restriction is not a problem in most cases
> (certainly I've never found it to be a problem).  It only spells doom if the
> iBATIS classes are actually loaded by the parent classloader - which is why
> I thought that the iBATIS jars must be on some global classpath in addition
> to being in your EAR.  This is the same reason the Struts folks do not
> support putting struts.jar in the EAR - it must be in
> web-inf\lib.  Certain libraries (like commons-digester) can be made to work
> differently, but they are the rare ones.
> J2EE classloading is a mysterious and not very well understood issue.  And
> there is enough ambiguity in the spec that the different app servers do
> things differently too.  At this point, I would suggest looking in the JBoss
> documentation regarding any settings for classloader configuration in
> JBoss.  There should be a way to set it up so that the classes loaded by the
> EAR classloader can see each other.
> I can't imagine that you are the only person in the world using iBATIS in
> an EAR on JBoss - so there's got to be a way to make it work.  But I'm not a
> JBoss user, so I'm probably at the end of what I can offer.
> Jeff Butler
> On 4/7/06, Alexander Sack <pisymbol@gmail.com> wrote:
> > Yea no.  iBatis is in the EAR and only in the EAR.  Without the MANIFEST
> > file, I get com/ibatis/blah not found which I expect.
> >
> > Your last statement ("Bottom Line") though is interesting.  That could
> > spell doom for me (and many others) using iBatis under an EAR where the
> > classloader maybe the parent from where the actual resource files are
> > located (unless I'm doing something or setting something incorrectly).
> >
> > At this point, I'm not sure what to do.  I can play with the context
> > classloader to get it to load but that doesn't seem right to me and there
> > are other issues with that if a resource file references a shared callback
> > from ane xternal library.
> >
> >
> > -aps
> >

"What lies behind us and what lies in front of us is of little concern to
what lies within us." -Ralph Waldo Emerson

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