Mouse doesn't work during debugging JavaFX projects in idea is running on KDE 5

Question

When I am debugging JavaFX project and debugging process stops on a breakpoint i can't use a mouse. I can move the cursor on the screen, but left, right buttons and wheel don't work. More than, the mouse doesn't work system-wild: if I switch an active window the mouse won't work in this window too. Keyboard works well.

I use:

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• IntelliJ IDEA 2016.2.3
• Build #IU-162.1812.17, built on August 30, 2016
• JRE: 1.8.0_112-release-b287 amd64
• JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o

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• KDE Plasma 5.5.1
• QT 5.5.1
• Kernel 4.4.0.36-generic

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→ java -version 

java version "1.8.0_101"
Java(TM) SE Runtime Environment (build 1.8.0_101-b13)
Java HotSpot(TM) 64-Bit Server VM (build 25.101-b13, mixed mode)

Also, this issue appeared on other DEs (xfce) and different hardware (on my laptop).

Answer 1

A solution is listed here: https://netbeans.org/bugzilla/show_bug.cgi?id=253594

To use this in IntelliJ - Go to Run -> Edit Configurations, and add:

-Dglass.disableGrab=true

to VM Options.

Edit: Heads up - this messes with Drag/Drop events, possibly causing them to not work or work unexpectedly. If you are implementing drag/drop this solution is problematic.