Prompt error message in JSP

May I know how to prompt an error message in JSP?? can I use alert() as in javascript? what's the proper syntax to do it???

Just to simplify what is already said: All JSP code, without exception, is executed on the server side, and when the JSP page is shown to the user (client) there is no execution of any JSP CODE, you can only use the information supplied by the JSP code.
/R

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