how to set org.apache.tomcat.util.digester.EnvironmentPropertySource in tomcat

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I want to set environment variables via Kubernetes for server.xml in tomcat. Here is my deployment.yaml:

apiVersion: v1
kind: Pod
metadata:
 name: tomcat-test-pod
...
...
env:
  - name: hostName
    value: 'test.com'
  - name: localhost
    value: 'localhost.com'

And here is my server.xml:

<?xml version='1.0' encoding='utf-8'?>
<Resource 
      auth="Container" 
      description="Global E-Mail Resource" 
      mail.debug="false" 
      mail.smtp.auth="false" 
      mail.smtp.ehlo="true" 
      mail.smtp.host="${hostName}"
      mail.smtp.localhost="${localhost}"  
      mail.smtp.port="25" 
      mail.smtp.sendpartial="true" 
      mail.transport.protocol="smtp" 
      name="mail/Session" 
      type="javax.mail.Session"/>

From https://tomcat.apache.org/tomcat-9.0-doc/config/systemprops.html, it says that I need to set org.apache.tomcat.util.digester. PROPERTY_SOURCE to org.apache.tomcat.util.digester.EnvironmentPropertySource, but I am not sure what I am supposed to do. Do I need to set it in setenv.sh or do I need to create another class? Any help will be appreciated..

kubernetes tomcat java
1 Answers

org.apache.tomcat.util.digester.PROPERTY_SOURCE is a Java system property so you can set it where system properties are accepted:

  • you can add it to the command line options, e.g. by adding to setenv.sh:
CATALINA_OPTS="$CATALINA_OPTS -Dorg.apache.tomcat.util.digester.PROPERTY_SOURCE=org.apache.tomcat.util.digester.EnvironmentPropertySource

This will work only if you call catalina.sh/startup.sh to start Tomcat (directly or indirecly). For example it will not work on Windows, when starting Tomcat as a service.

  • add the system property to catalina.properties:
org.apache.tomcat.util.digester.PROPERTY_SOURCE=org.apache.tomcat.util.digester.EnvironmentPropertySource

This always works.

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