So I've been trying something similar. I noticed that most of the Bookkeeper codebase can build with JDK8 and JDK11. So I hacked around a bit and found that if I compile BK using JDK8, reset JAVA_HOME to JDK11 and use 'mvn surefire:test', it just runs the tests without compilation. In this way, all of our unit tests run on JDK11 while being compiled on JDK8. We already have 78% + coverage from unit tests which means that 78%+ code base will have no problems.
When it comes to runtime, most obvious problems running on JDK11 are most of the JDK8 GC options which have been retired so we can have scripts which deploy differently for different underlying JDK versions. Since we can run JDK8 compiled bits on JDK11, we could propose a phased approach. For the next two releases, ship both JDK8 and JDK11. Post that, we can fully move to JDK11 for compilation and runtime. Regards, Anup On Wed, Oct 21, 2020 at 11:49 PM Alessandro Luccaroni - Diennea <alessandro.luccar...@diennea.com.invalid> wrote: > Hi, > for the sake of the ZK project I hope they don’t go down that route (I’ve > already exposed my concern on the ZK mailing list) since there are many > application in the wild that will be stuck on an older version of ZK. > > From my own company point of view we already support Java11 in all our > applications so we are not directly impacted (and we have upgrade path for > older versions to provide to our customers). > Since BK is a much younger project I don’t expect that the move to Java11 > will be a problem. I think that Pulsar still supports Java8. > > Even in the case that the ZK team will decide to not go down that route > (and still maintain Java8 support) I think that we should plan that move > for BK to prevent a similar situation in the future (naturally, as soon as > Pulsar will drop support for Java8). > > Alessandro Luccaroni > Platform Manager @ Diennea - MagNews > Tel.: (+39) 0546 066100 Int. 924 - Mob.: (+39) 393 7273519 > Viale G.Marconi 30/14 - 48018 Faenza (RA) - Italy > > Da: Enrico Olivelli <eolive...@gmail.com> > Inviato: mercoledì 21 ottobre 2020 11:24 > A: Bookkeeper-Dev <d...@bookkeeper.apache.org>; user < > user@bookkeeper.apache.org> > Oggetto: Moving BooKeeper to JDK11 > > Hello guys, > (crossposting to user and dev) > In the ZooKeeper project there is an open discussion about moving > ZooKeeper 3.7 to JDK11 and basically dropping support for JDK8 in the > client. > > If they go that route we will probably need to move in the same direction. > > How do you feel about this? > Is JDK8 still required for your applications ? > > Best regards > Enrico > > > ________________________________ > > CONFIDENTIALITY & PRIVACY NOTICE > This e-mail (including any attachments) is strictly confidential and may > also contain privileged information. If you are not the intended recipient > you are not authorised to read, print, save, process or disclose this > message. If you have received this message by mistake, please inform the > sender immediately and destroy this e-mail, its attachments and any copies. > Any use, distribution, reproduction or disclosure by any person other than > the intended recipient is strictly prohibited and the person responsible > may incur in penalties. > The use of this e-mail is only for professional purposes; there is no > guarantee that the correspondence towards this e-mail will be read only by > the recipient, because, under certain circumstances, there may be a need to > access this email by third subjects belonging to the Company. > -- Anup Ghatage www.ghatage.com
