Short Description
This library is used for JavaScript in the Scripting Editor. It is integrated in Java 6 & 7 by default, but for a better compatibility between those two versions, this library is used.
Source code: https://gitlab.pasteur.fr/bia/rhinoplugin
Documentation
Rhino is an open-source implementation of JavaScript written entirely in Java. It is typically embedded into Java applications to provide scripting to end users. It is embedded in J2SE 6 as the default Java scripting engine.
Link to website.