Details
Description
The RxJava 3.0 is already in RC1 stage (https://github.com/ReactiveX/RxJava/releases/tag/v3.0.0), we should be able support it on the reactive invocation handler side. The breaking changes: https://github.com/ReactiveX/RxJava/wiki/What's-different-in-3.0
Documentation: https://cwiki.apache.org/confluence/display/CXF20DOC/JAX-RS+RxJava#JAX-RSRxJava-RxJava3FlowableandObservablesupport