Demo code and docs can be found in the subprojects, e.g. https://github.com/apache/groovy/blob/GROOVY-9381_3/subprojects/groovy-rxjava/src/spec/doc/rxjava-userguide.adoc https://github.com/apache/groovy/blob/GROOVY-9381_3/subprojects/groovy-rxjava/src/spec/test/groovy/org/apache/groovy/rxjava/RxJavaDocSpecTest.groovy https://github.com/apache/groovy/blob/GROOVY-9381_3/subprojects/groovy-rxjava/src/test/groovy/org/apache/groovy/rxjava/RxJavaAwaitableAdapterTest.groovy