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I won't close the application if x button was pressed. How is this possible?

This depends on the UI implementation.

If you use Vaadin UI, it can't be done because JVx can't change the browser handling.
If you use Swing UI, it's easy because the launcher is the frame:

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getLauncher().eventWindowClosing().addListener(this, "doWindowClosing");

If you add a listener to the event, the default implementation will be completely ignored.

Don't forget to call:

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getLauncher().dispose();

in your listener, to close the frame, if needed.