JMH gradle without plugin for multi-module projects

build.gradle

...

subprojects {
    ...

    apply plugin: 'java'
    apply plugin: 'scala'

    sourceCompatibility = 1.8
    targetCompatibility = 1.8

    sourceSets.main {
        java.srcDirs = ['src/main/java']
        scala.srcDirs = ['src/main/scala']
        scala.include '**/*.*'
    }

    sourceSets.test {
        java.srcDirs = ['src/test/java']
        scala.srcDirs = ['src/test/scala']
        scala.include '**/*.*'
    }

    // https://docs.gradle.org/current/userguide/building_java_projects.html#sec:java_source_sets
    sourceSets {
        jmh {
            java.srcDirs = ['src/jmh/java']
            scala.srcDirs = ['src/jmh/scala']
            resources.srcDirs = ['src/jmh/resources']
            compileClasspath += sourceSets.main.runtimeClasspath
        }
    }

    dependencies {
        ...

        jmhImplementation 'org.openjdk.jmh:jmh-core:1.21'
        jmhImplementation 'org.openjdk.jmh:jmh-generator-annprocess:1.21'
    }

    // https://docs.gradle.org/current/dsl/org.gradle.api.tasks.JavaExec.html
    task jmh(type: JavaExec, dependsOn: jmhClasses) {
        main = 'org.openjdk.jmh.Main'
        classpath = sourceSets.jmh.compileClasspath + sourceSets.jmh.runtimeClasspath

        // To enable the built-in stacktrace sampling profiler
        // args = ['-prof', 'stack']
    }

    // to make sure benchmarks always get compiled
    classes.finalizedBy(jmhClasses)
}

...

Since Gradle 4.6 you have to replace

jmhImplementation 'org.openjdk.jmh:jmh-generator-annprocess:1.21'

with

jmhAnnotationProcessor 'org.openjdk.jmh:jmh-generator-annprocess:1.21'

I have been struggling for a while with the correct build.gradle for a JMH project. Although this snippet shows interesting things I am still having a [ERROR] [system.err] Exception in thread "main" java.lang.RuntimeException: ERROR: Unable to find the resource: /META-INF/BenchmarkList.

@edumucelli, have you tried this https://dev.to/o_a_e/jmh-with-gradle--from-easy-to-simple-52ec ?

@jlussagnet thanks for the suggestion. Yes, I have tried that one too. No lucky yet. The project I am struggling with is at https://github.com/edumucelli/benchmark-xgboost-java if you are feeling generous and want to give it a try, that'd be greatly appreciated :-)

@edumucelli Looking at your code I think the error may be that you only list dependencies for the compile task. A while ago I posted a minimal configuration for running JMH in Gradle 5 on my blog. This version uses the Gradle Kotlin DSL, but maybe it can still be of use for you. I would guess that you have to change this:

compile group: 'org.openjdk.jmh', name: 'jmh-generator-annprocess', version: '1.23'

to this

annotationProcessor group: 'org.openjdk.jmh', name: 'jmh-generator-annprocess', version: '1.23'

Maybe you also need to use implementation instead of compile.

Thanks, @CSchoel! I have had checked your post before and I was not able to make it work as I am not very used to the the Gradle scripting, converting it from Kotlin DSL was also not straightforward for me. However, giving a second try it worked! I have then completely dropped the JMH gradle plugin! Here is the commit. Really appreciated!