we should make the following improvements:
- check whether we need all of the require bundles we added, if not, we should remove them.
- check whether we need the "visibility:=reexport" for require bundles, if not, we should remove it.
- check whether we really need to embed the jar files, if there are already osgi bundles inside of orbit repo, such as httpcomponent and jaskson, we shouldn't embed the original jars.
- sort the list
- avoid to use deprecated methods in code.
- avoid warning