ruby-rjb 1.5.3-2build1 (amd64 binary) in ubuntu zesty

 Rjb is a library that connect between Ruby and Java using the Java Native
 Interface.
 .
 Among others, it supports importing Java classes into Ruby's environemnt,
 instanciating objects with a number of type matching rules, calling instance
 method (overloaded or not), accessing fields, binding Ruby objects to Java
 interfaces, throws java exception in ruby-bounded-object, and inspecting
 object classes.