Currently Dozer depends on version 3.1 of commons-collections. In a project we are an environment which already depends in version 3.0 (Websphere Portal 6.0).
Dozer only depends in two locations on version 3.1, both using a default constructor of ListOrderedSet which is not present in common-collections 3.0. The default constructor can be replaced a call to decoratie a new ArrayList. All junit tests keep running. Dozer can than depend on version 3.0 and be used in the Websphere Portal 6.0 environment.
Attached is patch for this change.
Patch to change depency to commons-collections 3.0
I think this change can be included in the next release. But of course you will have to switch library on your own. The distribution will come with 3.1 as always.