Let’s say you have a very simple Java project that uses Gradle as build tool.

./gradlew jar works as expected and creates a jar file containing the required classes files and the manifest.

Why is it that this one is NOT working?

tasks.register('createJar', Jar) {
  group = 'Creating supadupa jar'
  description = "Blah blah ..."
  dependsOn 'jar'
}

./gradlew createJar creates a jar file that does NOT contain any class files (only the manifest file).