Referencing Environment Variables in web.xml

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You can use Ant-style variable substitution in any of the tomcat xml config files, such as:

<servlet-mapping>
    <servlet-name>mvc-dispatcher</servlet-name>
    <url-pattern>${foo}</url-pattern>
</servlet-mapping>

Where foo is a Java System Property (sysprop).

You can’t use OS Environment Variables (envvars) directly, I think…

To use envvars, you can put

set "CATALINA_OPTS=-DsomeJavaSysProp=%SOME_OS_ENVVAR%"

in bin/setenv.bat (or similarly in bin/setenv.sh for *nix). You may need to create that file. Tomcat will run this file when it starts.

As CATALINA_OPTS is an envvar (as opposed to a command line option), it should not be visible by other users on the system (save ancient Unixes), though I haven’t tested this.

http://tomcat.apache.org/tomcat-7.0-doc/config/

If you are using Spring, you can create a <context:property-placeholder/> bean and then directly use envvars or sysprops in Spring XML config files (though not web.xml).

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