I am trying to pass a env variable that is set in setenv.sh script to an application property file in .XML, with no luck

Something like this:

(setenv.sh)
export DB_PASSWORD=my_secure_password

application.xml file:

<Context>
    <Resource name="jdbc/mydb"
              auth="Container"
              type="javax.sql.DataSource"
              username="dbuser"
              password="${DB_PASSWORD}"

But when tomcat starts this component fails as it cannot get the password. Can you please tell me how to pass this variable into XML property file here?