Eclipse is invisible in system tray

Question

I just installed Eclipse, but I got a problem, after I minimize the Eclipse than it's not visible on system tray. I also check the ALT+Tab but there also isn't visible. I had to kill the process and restart. How can I fix this?

Answer 1

Press Super+w

It spreads all the windows in current workspace.

You dont have to kill the application

Answer 2

Finally I figure it out:

I removed the eclipse:

sudo apt-get --purge remove eclipse
sudo apt-get autoclean

I installed again:

sudo apt-get install eclipse

And it's working now. I have no idea why didn't work before, case I have deleted the old ubuntu(10.04) and I installed the 12.04 from scratch.