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From "Gili (JIRA)" <j...@apache.org>
Subject [jira] [Created] (MCOMPILER-369) Adding module-info.java breaks JMH annotation processor
Date Wed, 26 Dec 2018 07:15:00 GMT
Gili created MCOMPILER-369:
------------------------------

             Summary: Adding module-info.java breaks JMH annotation processor
                 Key: MCOMPILER-369
                 URL: https://issues.apache.org/jira/browse/MCOMPILER-369
             Project: Maven Compiler Plugin
          Issue Type: Bug
    Affects Versions: 3.8.0
            Reporter: Gili
         Attachments: annotation-processor-jigsaw.zip

# Open testcase
 # Run {{clean install}}. Notice that the benchmarks run.
 # Open {{pom.xml}} and comment-out the {{<annotationProcessorPaths> section.}}
 # Run {{clean install}}. Notice that the annotation processor does not run and the benchmarks
break.
 # Delete/rename {{module-info.java}}.
 # Run {{clean install}}. Notice that the benchmarks work again.

The documentation for {{<annotationProcessorPaths>}} states that by default annotation
processors are detected from the classpath. It seems that adding {{module-info.java}} breaks
that somehow, which is weird/unexpected because JMH exists as a dependency outside the newly-declared
module.

I did two things to prove that the annotation processor is not being invoked in step 4:
 # Notice that {{target/test-classes/META-INF}} is not created.
 # Place a breakpoint in {{org.openjdk.jmh.generators.BenchmarkProcessor}} and notice that
it is never even constructed.

I tried digging into the maven-compiler-plugin and plexus-compiler source-code but couldn't
figure out where the problem is. The only workaround I found is to specify {{annotationProcessorPaths}}
manually but it took me half a day to track down this problem.

Any idea what is going on? Is this a bug in the plugin(s)?



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