Filtering out JVM argument warnings using TaskCollection#matching(Spec...)

build.gradle

allprojects {
  repositories {
    jcenter()
  }
  
  afterEvaluate {
      project.tasks.matching(new Spec<Task> () {
        def boolean isSatisfiedBy(Task el) {
          return (el instanceof JavaExec || el instanceof Test) ? true : false
        }
      }).each {
         it.jvmArgs "--add-opens=java.base/java.lang=ALL-UNNAMED"
			}
  }
}

subprojects {
  version = "0.0.1-SNAPSHOT"
}

Much better solution can be found here on StackOverflow.

Thanks goes to ToYonos

Same solution but more compact

afterEvaluate {
    project.tasks
        .matching { el -> el instanceof JavaExec || el instanceof Test }
        .each { it.jvmArgs "--add-opens=java.base/java.lang=ALL-UNNAMED" }
  }

Your Groovy foo is much better than mine @ToYonos