ADDITIONAL SYSTEM INFORMATION :
Ubuntu 18 (64 bit), this is actually JDK 10.0.2 (could not select from drop down)

A DESCRIPTION OF THE PROBLEM :
I have a heap dump that reports a very weird GC root of type BoxView.

Download heap dump (383 MB compressed, 2.4 G uncompressed): http://botcompany.de:8081/boxview.zip
Screenshot VisualVM: http://botcompany.de/1004590/raw/1101738

How can BoxView be a Java frame / GC root? There 300,000 AWT components inside of it too.

Please advise.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Not sure

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
BoxView should not be a GC root
ACTUAL -
BoxView is a GC root and causes ~3gb memory consumption

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Not sure
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CUSTOMER SUBMITTED WORKAROUND :
None known