I know that there is an OSGi plugin for struts 2 that allows modular additions to made to a struts 2 web app. However, I also came across a roadmap type document for significant improvements to the core of the framework itself that would also leverage OSGi.
https://cwiki.apache.org/S2WIKI/struts-25-based-on-osgi.html Is this something that is under development? Or already in the framework perhaps?