Bringing this one back to life after 18 months :) I have had this problem ever since in each NetBeans session when running platform applications. And today I had enough so I have been poking around for hours and made some progress. I was able to track it down to the enablement of the plugin "JavaFX Implementation for Linux". (I do have this problem on Windows too but am unable to verify it there now.)
When this is enabled, the problem occurs, when disabled it does not. The testing was done on a fresh install of Ubuntu 21.10 in virtualbox with JDK 11 from the ubuntu repo. Being a SNAP user I got his plugin unknowingly activated by default, noticed this after doing a directory diff against the 12.6 binary zip. I'm not able to disable it from the snap but when I enable/disable the plugin in the standalone zip I'm able to predict the behavior of the IDE shutdown process. Here is the relevant excerpt from the original post. For a couple of days I've been noticing suspicious behavior when exiting the IDE after running platform applications based upon RELEASE120-1, I think. Even though the output window displays something like ------------------------------------------------------------------------ BUILD SUCCESS ------------------------------------------------------------------------ Total time: 16.010 s Finished at: 2020-06-15T16:45:24+02:00 ------------------------------------------------------------------------ and the menu item "Run/Stop build/run" is disabled I get the following dialog when exiting the IDE Exit IDE Exiting the IDE will terminate the following processes: Process - Run(...) Process - Run(...) Process - Run(...) ...* *Number of rows depending on the number of application starts. And the thing is, when I DO have the application running and trying to exit the IDE, the dialog shows two rows, one WITH "Process - ", and one without. I noticed this in my platform application, on Kubuntu and Windows, and was able to reproduce on a fresh project.
