Show a temporary window in SikuliX

I can't find documentation in SikuliX to show a window or dialog and hide/close it after configured time. Since SikuliX uses Jython behind the scenes and Jython can access Java easily then showing a simple Swing window should be straightforward.

Sample code below demonstrates

Alternative solution as proposed by Raiman
Reference(s):
Github
https://github.com/haru-a8n/CodeSamples/blob/master/sikulix/ShowMessage.sikuli/ShowMessage.py
Jython GUI Sample applications
http://www.jython.org/jythonbook/en/1.0/GUIApplications.html
Swing Sample applications in Jython
https://wiki.python.org/jython/SwingExamples

"console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0" message when opening a PyDev console

When opening a PyDev console using Jython 2.7b3, I am getting the following error message.

console: Failed to install '': java.nio.charset.UnsupportedCharsetException: cp0

This does not show up in Jython 2.5. Note that this was already reported elsewhere, like:
http://sourceforge.net/p/jython/mailman/message/32935457/
http://bugs.jython.org/issue2222%3E

To workaround this issue, add -Dpython.console.encoding=UTF-8 in PyDev configuration, see below for details.