How can java control window object?

Client side controlling like window.open(), window.close() and window.opener.reload() make me headacid. I have java class to handle controlling. Is there any way java can control window object. like closing/openning popup window?
Thanks.

that looks like Javascript not Java
Java has possibilities to manipulate windows but in the JSP context all that manipulating is nonsense because JSP run at server.

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