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From "Thomas B. Passin" <tpas...@mitretek.org>
Subject Re: version numbers in jars
Date Thu, 21 Feb 2002 20:23:56 GMT
[Berin Loritsch]

> Thomas B. Passin wrote:
> > [Elliotte Rusty Harold]
> >
> >
> >>You're still using the classpath for jars? I only do that when I want
> >>to change the classpath on a per-run basis, in which case I am
> >>changing it and using the version number is not a problem. However,
> >>for standard libraries like xerces.jar that are shared among multiple
> >>applications I just dump them in my ext directory and forget about
> >>them. It's much easier than changing the classpath.  My normal
> >>classpath doesn't contain any jar archives, just directories of my
> >>own compiled code that hasn't been bundled into a jar.
> >>
> >
> > If all those versions are in the ext directory, how do you make sure
that
> > any given app finds the right version?
>
>
> For some jars like Xerces/Xalan, if you code to the plugable API (aka
> JAXP), you only need to upgrade the jar--no recompilation or refactoring
> needed.
>
> For others, like the Commons Logging API change recently, this approach
> becomes messier.

Yes... and I'm asking about the case where different apps need different
versions of the jar, but the interfaces are still the same (or isn't that a
problem in practice?)

Tom P


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