We're trying to use netty 3.5 and 4.0 alpha in the same project. Since they have separate namespaces this works fine except for maven which evicts 3.5 when you include 4.0 alpha.

Since 4.0 breaks backwards compatibility it is likely that projects will want to be able to use both at once, particularly for 3rd party libraries (play 2.0 in our case).

This is similar to what happened with jMock and hibernate. They both solved it by submitting the new backward incompatible version under a different groupId (see discussion here: http://maven.40175.n5.nabble.com/Dep-to-same-artifact-in-different-versions-td202532.html).

(Or if there's some way to tell maven to just get both versions that would work fine for us as well).

Thanks. We're really enjoying 4.0 so far.