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Re: [eclipse-dev] Move JDT to Java 11 
On behalf of the AspectJ project and as the person who started the
related discussion in [1] (which led to [2]), I want to say that we are
glad that there is some clarification going on, even if it means losing
JDK 8 as a build and target platform. We understand that there are
limited resources to maintain this complex project, and as a consuming
Eclipse sibling project forking JDT Core (mostly ECJ) for the AspectJ
compiler, we will follow whatever decision is made upstream. If our
embracing your decision can help unblock overworked developers, we
sympathise, being in a similar situation. As long as we can still
compile to legacy target levels (most notably 8), we should be fine.
-- 
Alexander Kriegisch


[1] https://www.eclipse.org/lists/eclipse-dev/msg11669.html
[2] https://bugs.eclipse.org/bugs/show_bug.cgi?id=573283



Andrey Loskutov schrieb am 16.06.2021 20:31 (GMT +07:00):

> Hi all,
> 
> sorry for cross-posting, but I would like to take your attention to JDT
> specific topic that may affect some downstream JDT consumers.
> 
> *** Request to move JDT to Java 11 ***
> 
> 1) I request that JDT stops supporting compilation of JDT code on Java 8 and
> execution of JDT code on Java 8, for the 4.21 release, and switches to compile
> JDT project code against Java 11 libraries.
> 2) If this request would be agreed / approved, I would like to add an item to
> the 4.21 release plan [1] that Eclipse Compiler for Java (ecj) can only be used
> on Java 11+ runtime environment.
> 
> *** Reason for this request ***
> 
> JDT team is a very small team, overloaded since a very long time with support
> of various Java releases in compiler.
> This team can't afford to support running ecj on Java 8 AND on Java 11 AND on
> Java 16 AND on Java 17+ etc.
> The code complexity and the issues we see in JDT are overwhelming and
> constantly growing. 
> With every Java release more and more features need to be added to the code
> base, and the maintenance burden is becoming bigger, not smaller!
> 
> To simplify maintainers life and save time for proper Eclipse Java compiler
> support we should declare end of "run on Java 8" support in JDT code.
> To be honest: since we are not testing ecj on Java 8 since long time, no one
> can guarantee that any recent ecj version can run on Java 8 anyway.
> 
> *** Important note ***
> 
> This request doesn't mean JDT would not support compilation of programs with
> Java 8 target!  
> We still support compilation targets from Java 1.3 to the latest Java release.
> 
> This request is only about JDT own project code that will be compiled with Java
> 11 target. Moving JDT to Java 11 would also open a door for possible
> contributions that could use API's only available since Java 9+, but that's not
> the main driver here.
> 
> Please note, that Eclipse platform (IDE/RCP) as a whole does not support
> compilation/execution on Java 8 since 4.17 release (2020-09) and we do not run
> any tests on Java 8 that would guarantee Java 8 compliance.
> 
> There is a discussion on bug 572389 [2], which is not a new one. Most of the
> Platform projects are already moved to compile against Java 11, only some parts
> of JDT related to the standalone compiler are still (theoretically) compatible
> to Java 8, the IDE part of JDT has dependencies to libraries / bundles that
> only support Java 11+.
> 
> *** What downstream consumers could do after move ***
> 
> If JDT code base is moved to Java 11, downstream consumers can do following:
> 
> 1) Use previously released JDT / ecj versions.
> 2) Run the build/application using JDT on Java 11+.
> 3) Clone JDT code and build / maintain own fork, compatible to Java 8.
> 4) Contribute to JDT.
> 
> *** Action item for PMC / JDT team *** 
> 
> Please, can we make a decision & have an agreement to drop "run on Java 8"
> support for 4.21, and move JDT code to Java 11?
> *If* not 4.21, can we please make a decision & have an agreement to drop "run
> on Java 8" support in JDT for some *concrete* platform version?
> 
> PS
> 
> Before someone would write an answer asking JDT project to continue "run on
> Java 8" support - please provide a *concrete* proposal, how *you* or your
> organisation could contribute to JDT, because nobody else is there that would
> have time to do that.
> 
> [1]
> https://www.eclipse.org/projects/project-plan.php?planurl=http://www.eclipse.org/eclipse/development/plans/eclipse_project_plan_4_21.xml
> [2] https://bugs.eclipse.org/bugs/show_bug.cgi?id=572389
> 
> Kind regards,
> Andrey Loskutov
> 
> Спасение утопающих - дело рук самих
> утопающих
> 
> https://www.eclipse.org/user/aloskutov
> 
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