...
Default CompletionStageRxInvoker can be accessed via Invocation.rx().
RxJava
...
Custom RxInvokerProvider can be registered with the Client as a provider. CXF ships one three such providercustom providers, org.apache.cxf.jaxrs.rx.client.ObservableRxInvokerProvider (RxJava1),
org.apache.cxf.jaxrs.rx2.client.ObservableRxInvokerProvider (RxJava2) and org.apache.cxf.jaxrs.rx2.client.FlowableRxInvokerProvider (RxJava2).
Registering it with the Client allows for working with RxJava Observable RxJava1 Observable or RxJava2 Observable or Flowable by doing Invocation.rx(Class<T> clazz), more specificallyexample,
Invocation.rx(org.apache.cxf.jaxrs.rxrx2.client.ObservableRxInvokerFlowableRxInvoker.class), etc.
Please see JAX-RS RxJava for more information.
...