John Gardner wrote:
Caldarale, Charles R wrote:
From: John Gardner [mailto:[EMAIL PROTECTED]
Subject: Multiple Time Zones on one Tomcat instance?
Is there any way we can serve mutliple webapps from a single Tomcat
instance, with mutliple timezones?
Tomcat itself doesn't care about time zones, and a single JVM instance will
only use one time zone at a time (no pun intended). You could run two
instances of Tomcat, one for the French, and one for the less picky rest of the
world. Other than that, you'd have to make the adjustments in the webapp
itself to be cognizant of each client's time preference.
Thanks Charles
So, using two instances of Tomcat on a single host OS would also involve
installing two JVMs and each Tomcat instance using a different JVM?
Would this be easy to do? I was always under the impression that you
could only ever have one Tomcat running per machine at any one time due
to the CATALINA_HOME env variable getting confused as to which instance
of Tomcat it is actually using?
I think there is a bit of confusion between "installation/installed" and
"instance".
To express it in lay words :
Terms like "installation directory", CATALINA_HOME, JAVA_HOME relate to
the disk directory where that piece of software's *files* are installed.
For example, for Tomcat, CATALINA_HOME might be /usr/share/tomcat5.5
or C:/Tomcat5.5.
Under that directory, you would find subdirectories like "bin" or
"common" (where the actual Tomcat program files are located).
On the other hand, nothing stops you from running several "instances" of
these programs simultaneously, in parallel, each instance having its own
separate "run directory" and parameters.
This "run directory" for Tomcat is known as CATALINA_BASE.
You could for instance start two separate instances of Tomcat, which
would both use the program files located in CATALINA_HOME/bin, but
listen on different ports and use a different set of webapps.
In that case, the CATALINA_HOME of each instance would still be the same
(allowing them to find the programs to run), but their *CATALINA_BASE*
would be set differently; each of these Tomcat instances would look for
its own configuration files in CATALINA_BASE/conf and, by default, each
one would look in its own CATALINA_BASE/webapps directory for its webapps.
By default, there is only one instance of Tomcat running, and
CATALINA_BASE is, by default, the same as CATALINA_HOME.
But that ain't necessarily so.
The same happens with the JVM : you only need to install it once, no
matter how many separate instances you want to run. You should just
make sure that you start each instance with its own appropriate set of
parameters. In the case of the JVM, this is not done via environment
values such as CATALINA_HOME and CATALINA_BASE, but usually via "-D"
options on the java command-line.
Hope this helps.
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