Fails to build with Java 16

Current master branch (bef39826f631a62550b0e0f6c504c4fd90b62995) mvn clean install fails. Snippet of the failure output:

[INFO] --- maven-compiler-plugin:3.8.1:testCompile (default-testCompile) @ generator-processor ---
[INFO] Compiling 1 source file to /Users/nezda/code/immutables/generator-processor/target/test-classes
[INFO] -------------------------------------------------------------
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] Bad service configuration file, or exception thrown while constructing Processor object: javax.annotation.processing.Processor: Provider org.immutables.generator.processor.Processor could not be instantiated
[INFO] 1 error

jdk - openjdk version "16" 2021-03-16 mvn - Apache Maven 3.6.3 (cecedd343002696d0abb50b32b541b8a6ba2883f)

Once this is resolved can add it to the test matrix https://github.com/immutables/immutables/blob/master/.github/workflows/ci.yml#L16

[elucash]

Thank you for the investigation, that is exactly (and to my horror) what’s needed! The relatively good thing is that it affects only compiling under java16, not running resulting Immutables annotation processor. (only generator-generator processor…). The bad thing is that there were no plans to modernize these templating related stuff any time soon. I have a parser generator of my own in immutables/io, but had no plans to get to using it here. Maybe I’ll get to patching org.parboiled.transform.AsmUtils. if it is possible to avoid using that protected method. Is there any way to suppress java module system stuff at maven build time?

[nezda]

Pretty sure I at least tried to try that but I’ll try it again tomorrow.