How Use JOptionPane on a WEB borwser

Could some body tel if is it possible to use a JOptionPane on a web browser..
In this code line :
JOptionPane.showMessageDialog(null,"Le contenu " + chaine + " du "+ champs +" n'est pas valide","Validation",JOptionPane.ERROR_MESSAGE);
The first paramter is the contener which will display the error message frame..
Is there any way to set this paramter to the client web browser...
I use Servlet and JSP with MVC architecture : All my error message are only diplay on a WEB server if i put null in a first parameter of the showMessageDialog..
How could il display the JOptionPane on a client web broswer ?

Usually to display a popup message to a user on their browser you use JavaScript.

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