Configuration variable substitution using <resin:properties> and rvar()

This first part of a multi-part article on Resin configuration examines how to use EL variables in various situations to simplify Resin configuration. When we’re done you’ll understand how a simple database resource like this:

  <database jndi-name="jdbc/mysql">
    <driver type="com.mysql.jdbc.Driver">
      <url>jdbc:mysql://user:password@$192.168.1.1:3306/dbname</url>
    </driver>
  </database>

… can be dynamically merged with per-server properties like this:

dbserver : 192.168.1.1
app-0.dbserver : 192.168.1.23
app-1.dbserver : 192.168.1.64

… resulting in configuration that is simple, powerful, and well suited for deployment in a cloud environment.

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