JMH doesn't run inside a Java Module (Unable to find the resource: /META-INF/BenchmarkList)

Question

I took a project that uses maven-surefire-plugin (automated tests) to trigger JMH benchmarks and added module-info.java to it. Now, META-INF/BenchmarkList is no longer getting generated (in fact, the entire directory is missing) so I end up with the following error when launching the benchmarks:

ERROR: Unable to find the resource: /META-INF/BenchmarkList

I suspect that Java Modules is preventing the annotation processor from running properly, but I can't figure out how to fix it. Any ideas?

Piracy

In general, it's really tough to figure out the error or its cause when there is not an MCVE with the question though. Just sharing this since the question starts with maven-surefire and the answer ends it with maven-compiler instead. – Length

Answer 1

I figured it out through trial and error. It looks like a bug (or "feature") in maven-compiler-plugin 3.8.0. When module-info.java is present, the JMH annotation processor is no longer picked up automatically. Adding this configuration fixed the problem for me:

<plugin>
    <groupId>org.apache.maven.plugins</groupId>
    <artifactId>maven-compiler-plugin</artifactId>
    <configuration>
    [...]
        <annotationProcessorPaths>
            <path>
                <groupId>org.openjdk.jmh</groupId>
                <artifactId>jmh-generator-annprocess</artifactId>
                <version>${jmh.version}</version>
            </path>
        </annotationProcessorPaths>
    [...]
    </configuration>
</plugin>

UPDATE: I filed a bug report against maven-compiler-plugin.

Piracy

Worked for me too after mvn clean install. – Paulson

what is the value of jmh.version? – Tailored

@LizLamperouge Whatever version of JMH you want to use. – Piracy