Just an update to my previous comments. The 2.0.x branch is actively maintained and while I don't have a target release date for it, I expect we'll have one in the relatively near future.
Part of the rationale behind dropping JDK5 support is that we can no longer actively test both environments - especially considering that JDK5 is out of support. For users that still need to run with Java 5, there's the 2.0.x releases. which have nearly the same functionality as 2.1.x. For those that can, or have already moved up there's 2.1.x and beyond.
Is there something specific from 2.1 that you need in 2.0.x?