ErrorProne 2.9.0 with Java 8: "cannot access Response". Possible regression.

[aaime]

I'm getting a weird error when using ErrorProne with Java 8 in a large multi-module maven project.
Most of the modules build fine (eventually reporting errors spotted by ErrorProne) but one gives a ... less than useful error message:

> ~/devel/git-gs/src/extension/netcdf-out (ep_290) $ mvn clean install -Perrorprone8 -nsu
[INFO] Scanning for projects...
[INFO] 
[INFO] ---------------< org.geoserver.extension:gs-netcdf-out >----------------
[INFO] Building WCS NetCDF output Module 2.21-SNAPSHOT
[INFO] --------------------------------[ jar ]---------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:2.5:clean (default-clean) @ gs-netcdf-out ---
[INFO] 
[INFO] --- git-commit-id-plugin:4.0.3:revision (default) @ gs-netcdf-out ---
[INFO] 
[INFO] --- directory-maven-plugin:0.3.1:highest-basedir (directories) @ gs-netcdf-out ---
[INFO] Highest basedir set to: /home/aaime/devel/git-gs/src
[INFO] 
[INFO] --- fmt-maven-plugin:2.4.0:format (default) @ gs-netcdf-out ---
[debug] Using AOSP style
[INFO] Processed 34 files (0 reformatted).
[INFO] 
[INFO] --- maven-resources-plugin:2.6:resources (default-resources) @ gs-netcdf-out ---
[INFO] Using 'UTF-8' encoding to copy filtered resources.
[INFO] Copying 5 resources
[INFO] Copying 8 resources
[INFO] 
[INFO] --- maven-compiler-plugin:3.8.0:compile (default-compile) @ gs-netcdf-out ---
[INFO] Changes detected - recompiling the module!
[INFO] Compiling 25 source files to /home/aaime/devel/git-gs/src/extension/netcdf-out/target/classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR : 
[INFO] -------------------------------------------------------------
[ERROR] error: cannot access Response
[INFO] 1 error
[INFO] -------------------------------------------------------------
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time:  7.628 s
[INFO] Finished at: 2021-10-30T18:36:30+02:00
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.8.0:compile (default-compile) on project gs-netcdf-out: Compilation failure
[ERROR] error: cannot access Response
[ERROR] 
[ERROR] -> [Help 1]
[ERROR] 
[ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR] Re-run Maven using the -X switch to enable full debug logging.
[ERROR] 
[ERROR] For more information about the errors and possible solutions, please read the following articles:
[ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/MojoFailureException

The errorprone8 profile sets the compiler up for using ErrorProne with Java 8:
https://github.com/geoserver/geoserver/blob/main/src/pom.xml#L2319
The same project has more than 100 other modules in the same build, that are working fine... this gs-netcdf-out one has something "special" that makes it misbehave, but I could not say what.

The same module built fine with the previous ErrorProne version we were using, 2.3.4.
I've also run the Maven build with -X, to get debugging output... I don't see anything useful, but maybe you'll spot something:
debug.txt