Three special forms of bundle

Three special forms of bundle

• Require Bundles

Require bundle is actually not a special form of bundle. It is a bundle that can be directly used by other bundle through require-bundle.
If require-bundle is used, all resource files and export packages of the bundle can be used.

• Fragment Bundles

Fragment bundle is a special bundle. It does not have an independent classloader and can be seen as a subsidiary of bundle, it specifies the fragment-host in the metadata to describe the bundle it is attached to. This fragment bundle will be activated only when the bundle is used.

• Extension Bundles

Extension bundle is also a special bundle. It is used to expand the system bundle. It can be extended by specifying the system bundle through fragment-host.