> Allow JDK modules that use preview features (preview language features or 
> preview API features from dependent modules) to participate without the need 
> to compile with `--enable-preview`.
> It's difficult to enable participation using an annotation due to the nature 
> in which symbols are encountered when processing source as there is no 
> guaranteed order to the processing of certain symbols.
> Instead a JDK module participates if the `java.base` package 
> `jdk.internal.javac` is exported to that module (@lahodaj clever idea!). An 
> internal annotation `jdk.internal.javac.ParticipatesInPreview` can be 
> declared on the module. Such a declaration cannot be enforced but does by its 
> use require the `jdk.internal.javac`'s export list to be updated.
> The modules `jdk.incubator.vector` and `jdk.incubator.concurrent` have been 
> updated accordingly, both of which participate in preview APIs (APIs in 
> `java.lang.foreign` and `Thread.ofVirtual`, respectively).

Paul Sandoz has updated the pull request incrementally with one additional 
commit since the last revision:

  Let java.management participate in preview features.


  - all: https://git.openjdk.java.net/jdk/pull/9087/files
  - new: https://git.openjdk.java.net/jdk/pull/9087/files/5e7ca855..9defdf23

 - full: https://webrevs.openjdk.java.net/?repo=jdk&pr=9087&range=01
 - incr: https://webrevs.openjdk.java.net/?repo=jdk&pr=9087&range=00-01

  Stats: 44 lines in 5 files changed: 4 ins; 29 del; 11 mod
  Patch: https://git.openjdk.java.net/jdk/pull/9087.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk pull/9087/head:pull/9087

PR: https://git.openjdk.java.net/jdk/pull/9087

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