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[eclipse-dev] Review, refactoring, cleanup/polish of all JEPs from Java 10 - 24 in ECJ
  • From: "Sankaran, Srikanth" <srikanth.sankaran@xxxxxxxxxxxxx>
  • Date: Wed, 30 Jul 2025 00:49:53 +0000
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  • Thread-topic: Review, refactoring, cleanup/polish of all JEPs from Java 10 - 24 in ECJ

Dear Eclipse/JDT users,

 

On behalf of the Eclipse JDT team and the Advantest R & D team, I am very pleased to share that, the effort we undertook in late 2023 to review and refactor ECJ’s support for all Java language enhancements [*][**] from Java 10 till Java 24, is finally over - after 20 long months!

 

As a part of this effort,

 

  • We reviewed the relevant JLS chapters/sections & JEP documents
  • Studied ECJ’s support for these features, making many improvements in design and implementation
  • Did extensive black box testing, white box testing, behavior compatibility testing against the reference implementation
  • Uncovered over a hundred defects; Also combed through Bugzilla & Github issues tracker to fix outstanding issues - closing over a couple of hundred defects in the compiler in the process

 

The language features covered are:

 

    • Pattern matching,
    • Sealed classes,
    • Record classes,
    • Switch Expressions,
    • Enhanced Switch statements,
    • Local variable type inference,
    • Nest based access control,
    • Text blocks and
    • Indy String concatenation.

 

This is not a big bang infusion of change – these improvements have been delivered gradually over the past several releases in 2024-2025 and the just published 4.37 M2 contains the cumulative changes.

 

Caveat Emptor: While due (and at times undue! 😊) diligence has been carried out, defects cannot be ruled out. Here then is a request for all interested parties to test 4.37 M2 (https://download.eclipse.org/eclipse/downloads/drops4/S-4.37M2-202507241800/) and report any issues encountered so that we can fix them in time for 4.37 GA.

 

Help us deliver a solid 4.37 release!

 

[*]  “JEP 467 – Markdown Javadoc comments” was not included in this effort since it is not a “language” construct per se. We plan to review/refactor this feature implementation later.

[**] While this effort beefed up (only) the compiler support of these language constructs, we are aware that weaknesses and non-trivial shortcomings exist in other areas such as code assistant for these features. We plan to address these in future.

 

Thanks,

Srikanth Sankaran.

Advantest R & D team & JDT/Core team.

 

 

 

 

 

 

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