[JMH] What to do if the JMH Gradle Plugin says FAILURE: Build failed with an exception. A failure occurred while executing me.champeau.gradle.IsolatedRunner [Gradle]

This is a workaround for the situation where the following error occurs with JMH Gradle Plugin ( me.champeau.gradle.jmh).

> Task :jmh FAILED

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':jmh'.
> A failure occurred while executing me.champeau.gradle.IsolatedRunner
   > Error during execution of benchmarks

In my case, it was due to the benchmark-related directory structure.

As listed in the README of the plugin, JMH Gradle Plugin has a benchmark under src / jmh. It is assumed. For this reason, it worked well by setting where the benchmark is, or by placing the benchmark under src / jmh with the following configuration.

At this point, it should be noted that the benchmark body must be placed in a package that matches the groupId of build.gradle.

bonus

This is the build.gradle.kts I was using.

kotlin:build.gradle.kts

plugins {
    kotlin("jvm") version "1.4.10"
    id("me.champeau.gradle.jmh") version "0.5.2"
}

group = "com.wrongwrong"
version = "1.0-SNAPSHOT"

repositories {
    mavenCentral()
}

dependencies {
    implementation(kotlin("stdlib"))

    implementation(group = "org.openjdk.jmh", name = "jmh-core", version = "1.25.2")
}