Our project moved to spring 3.2.2 and observed increased memory usage. I tracked it down to UndeclaredThrowableStrategy. Older Spring versions used cglib implementation of it and it has memory usage fixed in
But current spring version uses own implementation of the class which has memory issue - keeps ClassTransformer in private member when it is not actually used.
Attaching screenshots from Eclipse MAT.
In our project this uses 300-400 MB memory which gets wasted.