tomcat 5 using redirect

[mark sullivan via JavaKB.com]

Hi,
I'm using tomcat 5 with the jsp 2.0 specification and having an extreme
problem using redirects. An example would be like this:

<form action="itself" method="post">
//print some html
<%
if{//some condition satisfied}
//Access granted and redirect to new page
//This, the if statement does success
response.sendRedirect("new.jsp");
}
%>
</form>
Unfortunately this does not some to work, it redirects to itself. Does
anyone know does an issue arise for tomcat 5.0 using redirects? I had the
application running under tomcat 4.1 but needed to move to 5.0 to use tiles.
Mark.

 

[shakah]

Are you trying to POST the form to new.jsp when the condition is
satisfied, or trying to redirect to new.jsp instead of displaying the
form? If the former you can do something like:
<form action="<%=condition ? "new.jsp" : "itself"%>" method=POST>

If the latter, you can run into problems if you output too much HTML
before the call to sendRedirect(), as the headers might have already
been sent with the first block of the HTTP response. Either checking
the condition earlier or increasing the output buffer size can help in
this case.