Comment 3 for bug 1776724

I was wondering if there was something in my dotfiles which was causing the issue, so I tried again on a newly created user account. Unfortunately, that gave the same results as before.

However, I did manage to locate where NetBeans was sending its error output (.netbeans/8.1/var/log/messages.log). The file in question appears to contain a stack backtrace, which may well help to solve the problem; I've attached it to this bug report.