I've found several posts with instructions of how to kill java thread with jdb http://www.rhcedan.com/2010/06/22/killing-a-java-thread/ or on SO. This works. Now I want to kill thread with Intellij-IDEA debugger. Is it possible to do?
2 Answers
There is a little icon on the right side of the Debug view:

This will open 'Threads' tab and there you can right-click on some of them and select 'Interrupt' (and press F9 if you are sleeping on some breakpoint).
1 Comment
right click on threads -> Customize Threads View -> check Show method arguments typesThe accepted answer is now outdated (at least it is different for me in IntelliJ 2022.3.2). Just in case anyone (like me) stumbles upon it, there is a button at the right side of the debugger that allows you to show threads (it is disabled by default). see image below: 
Then you'll be able to select the thread you want to modify through the debugger by right clicking it.