Hello Tomcat users,
I have a need that I believe Tomcat's pluggable session manager
facility can satisfy, but I am having trouble getting it configured.
BTW, I have googled and searched the mail archives on this topic
and have not found anything useful yet.
My application requires a modular architecture in which pluggable
modules can be added a removed. We would like to use the web
container's ability to deploy, undeploy, and redeploy WAR files as
a means to install, uninstall, and upgrade the modules within our
system. However, there is also a need to share session state between
these modules which is not allowed in the servlet specification.
I have researched a few solutions (such as using a Singleton in a
common/lib/ package), but these solutions appear to require a non-
trivial amount of infrastructure (and configuration of filters and/or
session listeners) for every webapp. I would like to avoid all of that
explicit infrastructure and hide the complexity by using a custom
session manager.
Before I proceed with my question, does anyone have any other
suggestions for solving the above problem?
OK, here is the test case that I am trying. I have created a very simple
decorator which implements the org.apache.catalina.Manager interface.
It simply delegates all calls to an instance of StandardManager and
prints a message to System.out. Attached is the Tomcat config file
that I am trying to use to configure my custom session manager. I am
trying to use the <DefaultContext> tag to setup the manager on all
webapps.
Unfortunately, when I run a simple webapp (after restarting Tomcat, of
course) I am not seeing any output in any log file (nor to the console) from
my test manager.
Is my configuration invalid? What am I missing?
Sincere thanks,
Bryan
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Bryan Basham
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<Server port="8005" shutdown="SHUTDOWN">
<GlobalNamingResources>
<!-- Used by Manager webapp -->
<Resource name="UserDatabase" auth="Container"
type="org.apache.catalina.UserDatabase"
description="User database that can be updated and saved"
factory="org.apache.catalina.users.MemoryUserDatabaseFactory"
pathname="conf/tomcat-users.xml" />
</GlobalNamingResources>
<Service name="Catalina">
<Connector port="8080" />
<!-- This is here for compatibility only, not required -->
<Connector port="8009" protocol="AJP/1.3" />
<Engine name="Catalina" defaultHost="localhost">
<Realm className="org.apache.catalina.realm.UserDatabaseRealm"
resourceName="UserDatabase" />
<Host name="localhost" appBase="webapps">
<DefaultContext>
<Manager className="com.example.tomcat.TestSessionManager" />
</DefaultContext>
</Host>
</Engine>
</Service>
</Server>
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