Nexus is using a pretty well documented REST API which is usable externally as well.
For one of my customers I implemented a kind of automatic software update tool that can be embedded into any product. It is based on the Sonatype NEXUS repository manager.
… still it is possible to get hold of the actual type parameters of parameterized types. Even if classical reflection does not deliver type information, this type parameters can still be extremely useful. I have a few pieces of code (DAO, controllers, etc.) that are parameterized by class objects.
Very early Apache Shale came up with the idea of providing a view controller that allowed to execute dedicated methods (annotated, etc.) during various JSF life-cycle (phase) events for doing initialization work upfront for example. As Shale was hibernated, Apache Orchestra stepped in and added many more useful features.
Both frameworks are based on the idea of having a dedicated page bean (a JSF managed bean per view) that would control important processing steps for the entire view (page).
It requires following naming conventions in order to associate a page bean to a view, optionally a view controller mapper provided the ability of explicitely associating page beans and views.