IntelliJ cannot run tests since last update 2021.02

Solution for IntelliJ cannot run tests since last update 2021.02
is Given Below:

I have a very annoying problem.

I updated my IntelliJ lately to 2021.02

Since then I cannot run junit tests separately. If I run maven with tests, it works, build success with all tests. But if I want to execute test classes or methods separately (CTRL+SHIFT+F10), I got the following exception:

org.junit.runners.model.InvalidTestClassError: Invalid test class '':
  1. No runnable methods

    at org.junit.runners.ParentRunner.validate(
    at org.junit.runners.ParentRunner.<init>(
    at org.junit.runners.BlockJUnit4ClassRunner.<init>(
    at org.junit.runners.JUnit4.<init>(
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(
    at org.junit.runners.model.RunnerBuilder.safeRunnerForClass(
    at org.junit.internal.requests.ClassRequest.createRunner(
    at org.junit.internal.requests.MemoizingRequest.getRunner(
    at com.intellij.junit4.JUnit4IdeaTestRunner.startRunnerWithArgs(
    at com.intellij.rt.junit.IdeaTestRunner$Repeater.startRunnerWithArgs(
    at com.intellij.rt.junit.JUnitStarter.prepareStreamsAndStart(
    at com.intellij.rt.junit.JUnitStarter.main(

I deleted cache from IntelliJ, reloaded my application, rebuild maven, reload maven, reload everything.
And the very weird thing is that after reloading everything I can run a test class separately BUT ONLY FOR ONCE. For the next test run, I got again the error above. What the…

I use JDK 15.0.1

This is my current IntelliJ version:

enter image description here

This is a bug in IntelliJ IDEA, that will be fixed in 2021.2.1. See

Here are the workarounds available:

  1. downgrade to the previous release, 2021.1.x (download distr from the site)

  2. run tests in a package

  3. run pattern configuration with the class you want to run (only class/method are affected)

  4. downgrade spock version (works fine for versions before 2.0)