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Date: Mon, 29 Oct 2007 02:34:45 -0700 (PDT)
From: Maciek Datka <maco@parasoft.com>
To: axis-dev@ws.apache.org
Subject: Re: Axis problem in eclipse framework - class loading
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 <9efb15600710272003y6bb8b0dakb66bd4b4fe67f75c@mail.gmail.com>


> So as I know there is no problem at all to have more than 2 versions of
Axis2 set
> of plugins in the same eclipse framework. 

Thank you very much for the reply.

The exact situations in that 2 exclusive plugins (named jtest and mylyn)
contain axis.jar. The jar is the same version. (1.3 or 1.4 - both reproduce
the same behaviour)
Axis plugins WTP from 2.0 are not involved.

The jtest and mylyn plugins should not see each other'classes - they don't
depend on each other, in fact, they don't know anything about each other.

But then what happens

1 - axis from the jtest plugin is used and loads some of axis classes.
2 - axis from the mylyn plugin is used - but some of the classes it's using
are cached classes from the jtest plugin!
(Cached on classloder / JVM level)

This results in class cast exceptions - different class loader.

Possible fix would be just to change:

Class.forName(...,contextClassLoader) 
to:
contextClassLoader.loadClass()

The details why would that help:

http://blog.bjhargrave.com/2007/09/classforname-caches-defined-class-in.html
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