Java Community Process
The mechanism for developing technical specifications for Java.
Java Specification Request
Proposed and actual specification requests for Java features and technology.
Java Enhancement Proposal
A JEP is a proposal for a non-trivial enhancement to be added to the OpenJDK roadmap. It does not supplant the JCP and JEPs may create parallel JSRs or modify existing ones.
A Mechanism by which one language can call methods or functions implemented in another language. The FFI for Java is Java Native Interface (JNI).