I use a password manager program called JP or JPASSWORDS. I run it on Ubuntu 12.10 using OpenJDK Java 6. For security, it minimises itself after a short period, and requires a password to get back into it.
The problem I am seeing, is that, the launcher is unable to find the app for me after it has gone into this minimised mode. It shows in the launcher as an OpenJDK Java 6 runtime icon, with a little white pointer near it to show it is running, but clicking on the icon does nothing. Right clicking on the icon brings up the context menu, and the only thing I have found I can do is to quit the app and restart it.