[jax-rs-spec users] Re: JAX-RS 2.1 - work schedule

From: Markus KARG <>
Date: Thu, 12 Jan 2017 19:53:51 +0100

RxJava is not a JCP standard, and popularity can change easily. So it is doubtful whether non-standards have to be taken core of by standards. I cannot see any other JCP standard that enforces a detour in the API just for the sake of supporting non-standards. Correct me if I am wrong. A better way would be defining an SPI, or configuration, too statically choose in the bootstrat. I doubt that applications will mix differen RX implementations at runtime, so there is no need to say "I want RxJava" with every single call of the API.


Yes, Java 10. I heared that it might provide an official RX standard for Java SE. So JAX-RS "3+" might be facing a situation whethere it has to support an official standard. We have to take care that decisions for JAX-RS today must not stand in the way of usefulness and conciseness of JAX-RS in the future. I hardly think that in two or three years people like the idea that they have to write "rx(Classname)" always if possibly Java 10's reactive API took over and nobody talks about CompletableStage and RxJava anymore.


In the end, what we decide, is frozen for decades. I mean, that's a difference between breeding an international standard and simply providing a good API _for now_.




From: Sergey Beryozkin []
Sent: Donnerstag, 12. Januar 2017 18:56
Subject: Re: [jax-rs-spec users] JAX-RS 2.1 - work schedule


Java 10 ? JAX-RS 2.1 is Java 8 based, and RxJava is highly popular so voluntarily restricting 2.1. to CompletableStage only would be a mistake...
On 12/01/17 17:10, Markus KARG wrote:

The question is whether we actually want the ability to support other reactive implementations, or whether we decide to stick with CompletableStage? The rx intermediate method makes the API more complex for anybody. On the other hand, Java 10 possibly will provide a "real" reactive API for everyone, and we cannot natively support it, but enforce people to use rx() still, which is tedious. I cannot remember that the EG actually agreed upon a final answer of this dilemma.


From: Santiago Pericasgeertsen []
Sent: Donnerstag, 12. Januar 2017 16:00
Subject: Re: [jax-rs-spec users] JAX-RS 2.1 - work schedule



On Jan 11, 2017, at 4:17 PM, Pavel Bucek <> wrote:


So what's going to happen next? We are currently working in PoC implementation of Reactive client API which is currently in the JAX-RS source repository master branch - it is almost ready for review. We identified small improvement needed there and I'm going to take care of that, finish the PoC implementation and document the API on the wiki. Once this is done, I'll send a request for review to this mailing list.


 Just a quick reminder that the crux of the RX work is the addition of new rx() methods to Invocation, with default support for CompletionStage and an extension point to plug in other reactive implementations via the RxInvoker type [1].


— Santiago