db4o 4.4 has been released as a "development" version today. It is available on the download center page of the db4o website.

For this build we refactored our use of reflection functionality completely. All access to reflection is routed through a pluggable interface. We considered the refactoring to be necessary, to enable our new database browser, we will call it "ObjectManager". Since the browser has to be able to display all objects in the database, even if it does not have access to the "real" classes, db4o has to provide it's own "generic classes" and "generic objects". This is possible with the new pluggable reflection interface. db4o can now run against any sort of "class" or "object" - the reflection plugin simply tells db4o what "classes" and "objects" are. Besides enabling our "ObjectManager", the new technology opens a wide range of other new possibilities: