2010/5/27 Dan Armbrust <daniel.armbrust.l...@gmail.com>:
> I have a webapp running in Tomcat 6.0.20.
Some quick thoughts. Sorry if some are too trivial.
1. "Cannot create a session after the response has been committed"
means the following:
- "response was committed" means that some data were already sent to
the client, which always includes all the HTTP response headers, and
thus you cannot send more headers, nor discard previously rendered
part of the page.
- To fully create a session, Tomcat needs to create a sessionid and
send it to the client. The sessionid is sent in a cookie, and cookie
is sent through "Set-Cookie" http response header. If response is
already partially delivered, you cannot send a new header to the
client. I do not remember what the Servlet specification says here,
though.
2. Does your unexpectedError.jsp use sessions? Does it have <%...@page
session="false"%>?
3. If the response was already partially sent to the client and you
receive an "unexpected" error (while rendering some further part of
the page), it is not easy to properly handle this error outside of the
page that causes it. You should safeguard the page itself. In the old
time it was done with <% try { %><% } catch(...){ %>. IIRC, now you
can also use some exception handling tag provided by the JSTL tag
library.
If that issue is caused by some executable code on your JSP page (I
have not seen your auditLog.jsp , so I do not know), you may consider
moving the code off the page somewhere. Many people use some
frameworks that implement the MVC pattern here.
> I don't care
> about the error, other than I don't want it to appear in the log file
> as a "SEVERE: Exception " because that generates support tickets....
>
4. If such unexpected errors on some page are happening regularly I
personally would consider that a serious fault, which deserves a
support ticket. Though being unable to locate the source of the error
due to a faulty error handling page does not help much.
Best regards,
Konstantin Kolinko
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