RFR: 8317802: jmh tests fail with Unable to find the resource: /META-INF/BenchmarkList after JDK-8306819

[Jaikiran Pai]

Can I please get a review of this change which proposes to fix jmh test launch failures noted in https://bugs.openjdk.org/browse/JDK-8317802?

jmh apparently relies on annotation processors during compilation of a benchmark. When annotation processing is disabled, the generated benchmark jar is unusable when the benchmark is launched and fails with:


Exception in thread "main" java.lang.RuntimeException: ERROR: Unable to find the resource: /META-INF/BenchmarkList
	at org.openjdk.jmh.runner.AbstractResourceReader.getReaders(AbstractResourceReader.java:98)
	at org.openjdk.jmh.runner.BenchmarkList.find(BenchmarkList.java:124)
	at org.openjdk.jmh.runner.Runner.internalRun(Runner.java:252)
	at org.openjdk.jmh.runner.Runner.run(Runner.java:208)
	at org.openjdk.jmh.Main.main(Main.java:71)

After the integration of https://bugs.openjdk.org/browse/JDK-8306819 recently in JDK mainline, `javac` no longer runs annotation processors by default. These jmh tests that are compiled as part of the JDK build will now have to enable annotation processing explicitly.

The commit in this PR enables annotation processing by setting `-proc:full` (implying run annotation processors as well as compile the files) when compiling the benchmarks.

I tested this change locally. Without this change, the following command fails:


make test TEST="micro:java.lang.ArraysSort"                                                               
...
Test selection 'micro:java.lang.ArraysSort', will run:
* micro:java.lang.ArraysSort

Running test 'micro:java.lang.ArraysSort'
Exception in thread "main" java.lang.RuntimeException: ERROR: Unable to find the resource: /META-INF/BenchmarkList
	at org.openjdk.jmh.runner.AbstractResourceReader.getReaders(AbstractResourceReader.java:98)
	at org.openjdk.jmh.runner.BenchmarkList.find(BenchmarkList.java:124)
	at org.openjdk.jmh.runner.Runner.internalRun(Runner.java:252)
	at org.openjdk.jmh.runner.Runner.run(Runner.java:208)
	at org.openjdk.jmh.Main.main(Main.java:71)
Finished running test 'micro:java.lang.ArraysSort'



After the change in this PR, the same command works fine and the jmh benchmark is run.

-------------

Commit messages:
 - 8317802: jmh tests fail with Unable to find the resource: /META-INF/BenchmarkList after JDK-8306819

Changes: https://git.openjdk.org/jdk/pull/16122/files
 Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=16122&range=00
  Issue: https://bugs.openjdk.org/browse/JDK-8317802
  Stats: 4 lines in 1 file changed: 2 ins; 0 del; 2 mod
  Patch: https://git.openjdk.org/jdk/pull/16122.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/16122/head:pull/16122

PR: https://git.openjdk.org/jdk/pull/16122