Ranchers,
What it means by saying,
A <
jsp:forward> won�t work if
■ There is no buffer (in a JSP, this can be achieved with a page directive, setting the buffer attribute to �none�), and even one character has been written to the response.
■ The buffer has been explicitly flushed (response.flushBuffer()).
■ The buffer has been automatically flushed on filling up (in a JSP, this will happen by default�see the page directive attribute autoFlush for more
information).
If you try to do any of the above, you�ll get an
IllegalStateException.
