I want to build an application at least compatible with Windows.

I'm not sure about JRuby. Is it better to use JRuby or pure Java? I 
think to use an alternative is a source of bugs.

About Shoes, it seems to be very simple. Is it possible to create trees, 
panels and more advanced components?

To create a local web app can be more complexe because it must have a 
web server.

For the moment, I think I will develop a desktop application with Java.

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