On May 27, 2008, at 7:32 PM, Andrew Thorburn wrote:
Encountered another part of the problem:
I can package the frontend stuff (that would normally be found in
WAR/WEB-INF/classes into a JAR, put that in EAR/lib, and everything
works. However, my boss doesn't like that.
Why not? that's basically the only arrangement that will work....
It sounds a bit like the dependencies between the jars you are dealing
with are somewhat mixed up. In my experience when this kind of
problem is straightened out everyone finds it much easier to make
progress and makes fewer mistakes.
But if I leave the classes in WAR/WEB-INF, then I get a "Class Not
Found" exception from one of the libs in EAR/lib, which is trying to
load, via reflection, one of the classes in the frontend. I
understand why that doesn't work, thanks to your explanation of the
classloader.
Obviously, if I move the libs from EAR/lib to EAR/WAR/WEB-INF/lib,
then all is good. Except that my MDB can't find the libs anymore.
Bugger.
This problem will occur if I duplicate the libs, yes? I'm reasonably
sure it did last time.
I'd expect so.
Further, if I set "reverse-classloading" to true, then I'm bound to
get all sorts of problems, and if my MDB tries to access a static
method (say, getInstance() for a class where that pattern is used),
it will, essentially, call a *different* method to the one the
classes in the WAR would call, yes? And return a different object.
Not cool.
I think that would produce more problems that it would solve.
Can't really go around moving things, as the logging class (that's
basically essential) is in the same package as the reflection-using
class.
Any ideas here apart from "Don't use Reflection", and "Don't call
from libs to main"?
Now, I think the solution I want is to have the libs able to access
the frontend (in WEB-INF), while at the same time being access
exactly the same libs from my MDB, and I don't think that's possible
in Geronimo?
Not at present. We could add a "single classloader per ear" flag
fairly easily but it probably won't get into a release for a month or
two.
I'd start by asking why you can't straighten out the dependencies.
thanks
david jencks
