RxJava includes language adaptor submodules. These modules are additive to the rxjava-core library in the classpath.
For example, to use the Scala adaptor you would have the rxjava-core-x.y.z.jar and rxjava-scala-x-y-z.jar.
If there is a language you'd like supported please look at the existing adaptors (such as Groovy) and implement the adaptor for your language of choice.
If you feel it would be valuable for the community submit a pull request and we'll accept it into the main project.
Please comply with the conventions established by the existing language adaptors if you intend to submit a pull request.