[jboss-dev-forums] [Design of JBoss/Tomcat Integration] - Missing Servlet Parameters - JBoss 4.0.3

[rheim]

Has anyone seen a problem similar to the following:

We use OpenSTA to generate varying degrees of load to test our application j2ee app using JBoss/Hibernate vs MSSQL.  

At low levels (75 users generating approx 5000 requests/minute) the tests complete without issue.  However, when we try and ramp up the test to more modest levels (150 users generating approx 10,000 requests/minute) our application fails on random Servlet requests where the parameters are null.

Checking our test we noted that OpenSTA sent the request with the correct parameters.  Also, using a packet sniffer on the webserver machine, we verified that the webserver received all the packets containing these parameters, however the application log we have shows the parameters weren't submitted.

I'm guessing this is a load related item but being a JBoss novice I'm not sure where to really look.

We thought the problem might be related to the configuration of the HTTP connector and have played around with the acceptCount (varied from 100 to 500) and bufferSize (from default 2048 to 102400) parameters, but these don't seem to make much of a difference to the issue.  Also, we tried setting the maxKeepAliveRequests to -1 in the thought this was the issue, but alas to no avail.

The machine we are running is averaging 65% CPU utilization and we have plenty of memory available (avg 500 MB free) during the test run.  Also, using the same hardware we are able to test the previous version of our product using BEA Weblogic Server 7.0 (SP5) up to around 250 of these virtual users.

I'd be more than happy to deliver greater detail about specific configuration settings, just let me know.

Thanks in advance for you help.

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