Bug#508342:

[Ludovic Claude]

Tag: fixed

This is not really a bug. The JDK is needed for some Ant tasks, in
particular the common task of compiling.
The Ant package does indicate a few JDK as Suggests (it was Recommends,
but some distributions always install recommended packages, which can be
problematic), so there are enough hints in the package to get this
problem solved on your own.

Ludovic