Will the context.xml file meet your requirement?
http://javabeat.net/tomcat-jndi/
On 7/4/2016 10:42 AM, Philip Hachey wrote:
> Hello. I am seeking some advice for the best ways to deploy Java web
> applications to different Tomcat environments.
>
> In particular, my application requires that a JNDI resource be defined
> for a database, where the database server address and credentials will
> vary depending on the environment the application is deployed to.
>
> * Tomcat: 8.0.36
> * OS: varies depending on the environment deployed to
>
> If I include in the WAR file, a META-INF/context.xml that includes the
> Resource element, Tomcat will use that to create the file:
> $CATALINA_HOME/conf/engine/host/my-application.xml
>
> The context file my-application.xml can then be modified so that the
> Resource settings are appropriate for the environment.
>
> However, if, for any reason, the application is undeployed and then
> re-deployed, my-application.xml will be recreated with the settings as
> they originally appeared in the WAR file.
>
> The options that seem evident to me are:
>
> 1) Create a different WAR file for each environment. This strikes me
> as a bit onerous.
>
> 2) Use environment variables in my-application.xml such as:
> url="${databaseurl}" and then define those environment variables using
> the Environment element in the GlobalNamingResources of Tomcat's
> server.xml.
>
> Regarding #2, would it be possible to instead use a properties file to
> define the variables? I assume adding entries to catalina.properties
> would work, but is it possible to define a properties file separate
> from catalina.properties which deals more with system properties
> rather than application properties?
>
> I haven't been able to find a documented standard methodology for
> Tomcat deployments to different environments, but I'm certain there
> must be some common and elegant ways of doing this. I'm interested in
> hearing what others have done.
>
> Thank you,
> Philip
>
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