One more way:
You can use VirtualWebappLoader
http://tomcat.apache.org/tomcat-6.0-doc/api/org/apache/catalina/loader/VirtualWebappLoader.html
It adds the listed classpath entries to the webapp classloader.
I do not know, whether it appends or prepends them, and as that is not
documented it can be different between versions, but the following is
certain: the libraries listed in virtualClasspath attribute are added
in that very order with respect to each other.
So, you can remove those conflicting libraries from WEB-INF/lib, e.g.
move them to /WEB-INF/lib2, and add them in that particular order that
you need.
Note, that you can reference Java properties in any values in the context file.
E.g. ${catalina.base}/webapps/myapp/WEB-INF/lib2/mylib.jar should work.
Wildcards, e.g. *.jar, are not supported.
The downside is that VirtualWebappLoader is not so widely used, and so
there may be not so much experience with it, but you may give it a
try.
Best regards,
Konstantin Kolinko
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