How one can use different versions of classes on differenet webapps

[Mark Thomas <markt (at) apache.org>]

Dmitry S. Kravchenko wrote:
> But the library is in permanently development, so we have new and new
> versions of it every several months. Sometimes it is not backward
> compatible. So we need old applications work with old version of library and
> new -- with new. Is it possible? Wouldn't these files interfere? We have
> same classnames in different versions of library. Does one applicationa is
> totally separated from other in the sense of names of classes?

The webapp class-loader handles this for you. See
http://tomcat.apache.org/tomcat-5.5-doc/class-loader-howto.html

> It seems to me, that we meet some interferention here. We got an exception
> about some signature:

Looks like you need to re-compile you servlets with the new version of
the library.

Mark


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