application/templates/default/context.xml.erb

<Context docBase="<%= @war %>" path="/"
        debug="5" reloadable="true" crossContext="true" allowLinking="true">
  <Environment name="appEnvironment" value="<%= node['app_environment'] %>"
          type="java.lang.String" override="false"/>
  <Resource name="jdbc/<%= @database['database'] %>" auth="Container" type="javax.sql.DataSource"
               maxActive="<%= @database['max_active'] %>" maxIdle="<%= @database['max_idle'] %>" maxWait="<%= @database['max_wait'] %>"
               username="<%= @database['username'] %>" password="<%= @database['password'] %>" driverClassName="<%= @database['driver'] %>"
               url="jdbc:<%= @database['adapter'] %>://<%= @host %>:3306/<%= @database['database'] %>"/>
</Context>