We have been getting "No Instance Available" from all our WebObjects
apps running on one of our OS X Server 10.5.4 servers, but no
problems on our other servers configured the same way. We have
Tomcat 5.5 installed on these servers using the Apple supplied
mod_jk.so. The WebObjects apps are wo5.3.3/wonder4 apps with
embedded frameworks deployed using the Apple supplied woadaptor and
wotaskd and javamonitor from wo5.4.2.
The "No Instance Available" problem will not show for several hours
and then suddenly it will start happening on most, but not all,
requests. Doing odd things such as turning on, or turning off
debugging enabled, or enabling WODirectConnect for the instances seem
to get them working again. We can reproduce starting the problem by
calling one of the WebObjects apps which in turn calls a web service
running in tomcat and then returns a response (in this case a
dynamically generated PDF file). When this web service in tomcat is
on the same server as the webobjects app calling it, the problem starts.
We are currently working around the problem by moving the webobjects
app to a different server to the tomcat web service. If anyone has
any other ideas, please let me know.
The only other thing I can think that is unusual about our setup is
that we use multiple virtual hosts, a different one for each
webobjects app. So we can't use the same host name for the
webobjects apps and wotaskd, which apparently is a common cause of
"No Instance Available".
Cheers
Tim
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