We finally did it.
We have moved to hibernate 3.3.1 and hibernate annotations 3.4.0 in xplanner-plus 1.1a1.
Special thanks to Hoani Cross, for fixing a lot of problems related to hibernate upgrade.
Good news: we got annotation support for hibernate, and we have started this work!
Bad news: we still have a lot of work to do: move to OpenSessionInViewFilter, move to hibernate annotations, remove custom sessionFactory, move all database code to dao's and apply aop transaction pattern.