Guess what... It stopped!
I really don't have a clue what I did, but my cpu is 'normal' now (around 10%) and my home folder isn't spammed anymore with error messages. I just hope it doesn't start all over again with a reboot, but so far so good
Thx for all your replies
EDIT: Oh, I remeber why it stopped, I turned java off, but a reboot was needed for the changes to take effect. I don't have the need for Java right now, but I still consider this as a serious bug.
EDIT2: Well, it started again. I would appreciate it if a developer could look at this... and why can't I remove java?