I have a very odd situation...
I have an app running on Tomcat 5.0.1.8. We're using it as both a web
server and servlet container. What's happening is I'm getting
NullPointerExceptions in both JSP's and servlets that is a result of request
parameters seemingly being lost somewhere along the way. In other words, if
I submit a form to a servlet with a couple of fields, the parameters are not
showing up in the request object, hence I get NullPointerExceptions trying
to access them.
This is an intermittent problem, in fact it's fairly rare (which has saved
my a** at work thus far!), but I still have not been able to explain it. It
is happening at various points in my app, no consistent pattern that I've
been able to discern, all of which should theoretically be impossible to
have no parameters because the user is forced to enter things via
JavaScript, or clicking a button submits a hidden form, things like that.
I've tried the best I can to get it to happen on my development
installation, but of course I've been unable to replicate it, but I have
seen it on the production server so I know it's not just a stupid user trick
(although I can't rule out them doing something stupid that I just haven't
imagined).
I have a sneaking suspicion that it's a server tuning issue, and in fact I
just did some reading and it looks like my predecessor in charge of tuning
Tomcat really screwed up some things. Here's his connector configuration:
<Connector
allowTrace="true"
enableLookups="false"
redirectPort="8443"
secure="false"
acceptCount="100"
bufferSize="4096"
compression="off"
connectionLinger="-1"
connectionTimeout="60000"
debug="0"
disableUploadTimeout="true"
maxHttpHeaderSize="8192"
maxKeepAliveRequests="200"
maxSpareThreads="175"
maxThreads="300"
minSpareThreads="100"
port="8181"
socketBuffer="12000"
tcpNoDelay="true"
/>
That looks incredibly wrong to me in terms of tuning. The app has a TOTAL
of 87 users, and not all of them are using the app at the same time, and the
requests are certainly not coming all at the same time. I'm guessing we're
talking about an average of maybe 20 concurrent requests at any given time,
not a huge load by any stretch.
So, my question is twofold... One, has anyone ever seen such an issue as
missing parameters before, and if so, what information can you share with me
about it? Two, am I off my rocker to think that connector config is way out
of wack, and assuming it is, what suggestions would you guys have to fix it,
given the approximate load I've stated here?
Thanks in advance everyone!
Frank
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