Merge resources and classes for "run" task

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1

How can I merge the resources and the classes for the classpath of the “run” task?

I am reworking the build.gradle of the open source game “Terasology”. https://github.com/MovingBlocks/Terasology/blob/develop/build.gradle

It defines an own “run” task but I try to use the gradle “run” task. Both variants have a problem with the resource files. The program needs the resource files at the same folder like the classes. Running from a JAR file or from an IDE (eclipse) works fine, because the resource files are copied to the class files.

The current (and working) solution changes the output.

sourceSets {
  main {
    output.resourcesDir = 'target/classes/main'
  }
}

But this solution needs an ugly fix for the JAR task, because the resource files are twice.

jar.doFirst {
  // Work around for duplicate entries in jar bug
  sourceSets.main.output.resourcesDir = '/dev/null'
}
jar.doLast {
  sourceSets.main.output.resourcesDir = 'target/classes/main'
}

Is it possible (and wise) to copy the classes and resources to a new “run” folder and use this as the classpath for the “run” task?