jdbm problem

jdbm v1.0, the simple java text-based database has some critical bugs(though developers of jdbm don’t think so) the file size of db is not reduced when deleting or removing entries. it’s growing only. i know it’s not an easy job to implement delete function in B+tree, but it’s a very critical issue. why they notice it to everyone? making another db file is only a solution, now a day. you must be careful when you choose jdbm as your main db. though i know this bug, i choose to use this db. there’s no better solutions in java world, as far as i know.