I know. 
Two days ago I had a hub lockup, and when I finally got it back online, i could see java had crashed from the historical logs.
What exactly did you see?
Woke up to SQL server error this morning. Navigating around and got error 500 message. Couldn't get to the settings page so ended up pulling power to recover.
Sorry, I cant remember, but there were multiple java errors. I'd not seen it before, but I'd not looked right after a hub lockup.
I was just thankful to be back online, because it took me 4 or 5 attempts (pull plug) to get the hub operational.
