Resetting the UP-TO-DATE property of gradle tasks?

Question

Try to run your build with -C rebuild that rebuilds Gradle's cache.

In newer versions of Gradle, use --rerun-tasks

If you want just a single task to always run, you can set the outputs property inside of the task.

outputs.upToDateWhen { false }

Please be aware that if your task does not have any defined file inputs, Gradle may skip the task, even when using the above code. For example, in a Zip or Copy task there needs to be at least one file provided in the configuration phase of the task definition.

You can use cleanTaskname

Let's say you have

:someproject:sometask1 UP-TO-DATE
:someproject:sometask2 UP-TO-DATE
:someproject:sometask3 UP-TO-DATE

And you want to force let's say sometask2 to run again you can

someproject:cleanSometask2

before you run the task that runs it all.

Apparently in gradle, every task that understands UP-TO-DATE also understand how to clean itself.

I had a tough case where setting outputs.upToDateWhen { false } inside the task or adding the flag --rerun-tasks didn't help since the task's setOnlyIf kept being set to false each time I ran it.

Adding the following to build.gradle forced the execution of myTask:

gradle.taskGraph.whenReady { taskGraph ->
  def tasks = taskGraph.getAllTasks()
  tasks.each {
    def taskName = it.getName()
    if(taskName == 'myTask') {
      println("Found $taskName")

      it.setOnlyIf { true }
      it.outputs.upToDateWhen { false }
    }
  }
}