>So I tried this way,
>response.setHeader("REFRESH", 10)

This mechanism is also called 'client pull'.

>But i don't like this, instead i want my servlet screen automatically
>refreshed whenever the variable set to true (in thread)
>so how to refresh the page only one time whenever I need ?

What you really want is the mechanism called 'server push'.
Read all about it in Jason Hunter's book Java Servlet Programming
Chapter 6, last item (p191-194)

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