Mod jk selective forwarding performance problem 2007-08-06 - By Bill Bainbridge
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I am using Tomcat 5.5.23 with Apache 2.2.4 and mod_jk. The "payments" app uses
Struts, Spring and Tiles. I'd like to have Apache serve the images,
stylesheets and other static content that is referenced in the Struts jsps, but
when I try to do that, if the page isn't cached in the browser, it comes up
with no buttons (from the images/ directory) until I click the browser's
"Refresh" icon; then it shows up again with all the buttons. The apache error
log shows a "File does not exist:" message on the first try, e.g.:
File does not exist: /usr/apache/httpd/htdocs/payments/images/Bttn_IAgree.gif
;jsessionid?9B1578B6A813AAF2AB528C7DD398E4, referer: http://74.205.87.59
/payments/welcome.do (we're using the IP address until we go into production,
when we'll switch over the DNS for the domain name).
I don't have any problems at all when everything for the /payments/ address
goes to Tomcat. Here's the mod_jk section of httpd.conf:
LoadModule jk_module modules/mod_jk.so
JkWorkersFile /usr/apache/httpd/conf/workers.properties
JkShmFile /usr/apache/httpd/logs/mod_jk.shm
JkLogFile /usr/apache/httpd/logs/mod_jk.log
JkLogLevel warn
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "
JkMount /payments/* worker1
JkUnMount /payments/images/* worker1
JkUnMount /payments/html/* worker1
JkUnMount /payments/css/* worker1
I get the same results (no buttons the first time) when I leave out the
JkUnMount lines and change the JkMount line to:
JkMount/payments/*.do
Does anyone know why Apache can't find the image files the first time, but does
the second? Is this a page timeout thing? Thanks!
Bill
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