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http://jira.codehaus.org/browse/MNG-3491?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=132599#action_132599
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David Bernhard commented on MNG-3491:
-------------------------------------
I have written a plugin to do almost exactly this. It inspects all class files
and warns or fails if a class is twice on the classpath. There's also an
optional gui that shows a tree of all loaded classes and which jar they come
from. Bytewise comparison isn't there yet but wouldn't be hard to add.
At the moment it's part of the maven utilities in our EL4J framework
[http://el4j.sourceforge.net], as it was created to help build el4j (with
maven, of course). I can see about releasing it without any dependencies on
el4j core if you're interested.
> JAR hell detection
> ------------------
>
> Key: MNG-3491
> URL: http://jira.codehaus.org/browse/MNG-3491
> Project: Maven 2
> Issue Type: Improvement
> Components: Dependencies
> Affects Versions: 2.0.8
> Reporter: Andreas Krüger
>
> When your dependency tree contains the same class twice in two different
> versions, you are in JAR hell.
> I want Maven to detect whether that's where I am. So Maven should:
> * Open all JARs it has added to a dependency tree.
> * Check what classes are in each JAR (package name and class name).
> * If the same class is found twice in two different JARs, I want Maven to
> ** compare the two instances
> ** fail the build unless they turn out to be bytewise identical.
> All of these things should happen automatically, with every individual
> dependency tree.
> Unless the user specifically requests. E.g., if the user knows a particular
> set of classes is officially in the dependency tree (e.g., of a test), but
> never actually loaded, it should be possible to accept different versions of
> these classes (some wild card pattern).
> Regards, and thank you for providing fine software,
> Andreas
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