Of course, one can use tags like the following snippet in the file
"appengine-web.xml" under the "appengine-web-app" tag:

  <system-properties>
    <property
     name="java.util.logging.config.file"
     value="WEB-INF/classes/logging.properties"
    />

    <property
     name="log4j.configuration"
     value="file:WEB-INF/classes/log4j.properties"
    />

    <property
     name="MyApp.web.server.mode"
     value="GAE development"
    />
    -->
  </system-properties>

to set properties. The property "MyApp.web.server.mode" can be changed
in this file at deploy-time only. To change the setting (outside of a
change within your code) you would need to edit this file and upload
the new file to GAE production.

My suggestion of using persistent entities is that you would be able
to change persistent values without having to redeploy anything to GAE
production.

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