Peter wrote:
Hi all, I am having strange issues with tomcat 7 as well as tomcat 8,
following is details of that issue, please someone help me to configure
java for each webapps
Thanks for all the detailed information.
But I believe that you have things the wrong way around.
It is not a question of "the webapp (or Tomcat) choosing its Java JVM".
If you look at the way in which Tomcat is being started (script in /etc/init.d or
(tomcat_dir)/bin/startup.sh), you will see that the command being run is "java", followed
by parameters which tell this "java" which Java code modules to run.
(And not the other way around).
From the OS point of view, the process which really runs on your computer is a JVM (Java
Virtual Machine) (./java or whatever). Once you start this particular JVM process, you
tell it to load and run some Java code : in this case, a Tomcat java code module. This
Java code then starts to run (inside the JVM), and it reads its configuration files
(server.xml etc.) to set itself up. This includes which TCP/IP ports it should be
listening on, which Hosts and webapps it should load and configure etc.
You can start and run several (identical or different) JVM's concurrently, as distinct
processes within your OS, and you can tell each one to run a different set of Java code
modules : e.g. another Tomcat instance with different parameters, different Hosts and
different webapps.
(As long as the different instances do not conflict with one another, for example by
trying to use the same TCP/IP ports).
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