libpf4j-java - 3.8.0+dfsg-2 main

PF4J is a lightweight framework which helps one to build a modular application
by defining plugins, which are containers for extension points (defining
where, in the application, custom code may be called), for extensions (which
implement extension points) and for optional life-cycle methods to start, load
and stop extensions.
A plugin is similar to modules in other programming languages.