This issue was reported manually by jay-to-the-dee.
It already has 2 duplicates
Build: NetBeans IDE 8.0.2 (Build 201411181905)
VM: Java HotSpot(TM) 64-Bit Server VM, 25.60-b23, Java(TM) SE Runtime Environment, 1.8.0_60-b27
jay-to-the-dee: Occured on selecting reset window state. Was trying to view the application I'm developing's output.
I've noticed both these errors occurred using Official Sun Java only (1.8.0_60-b27)
GUEST: Unknown- I was modifying toolbars and settings.
java.awt.IllegalComponentStateException: component must be showing on the screen to determine its location
Created attachment 156130 [details]
Not a NetBeans bug.
Do not use com.jarego.jayatana with NetBeans or report bugs against that product.
Sorry hadn't seen in the back-trace that Jayatana had caused this. I myself have had problems with Jayatana with my own Java programs so stopped using it, but Ubuntu now uses it by default for all Java programs (inlcuding with NetBeans) despite it's bugginess for some reason :S I'll try and get this reported to the Jayatana developers!
Now reported on Launchpad here: https://bugs.launchpad.net/ubuntu/+source/jayatana/+bug/1497592