Grails: reading configuration at runtime

As far as You know some basic configuration in Your Grails application is located in Config.groovy (under grails-app/conf folder). Often it is very useful to access data from it at runtime. To do that You have to use org.codehaus.groovy.grails.commons.ConfigurationHolder. For example, let's read SMTP properties from one of the previous posts.

Config.groovy:

// Some simple SMTP configuration.
grails {
   mail {
      host = "smtp.gmail.com"
      port = 465
      username = "youracount@gmail.com"
      password = "yourpassword"
      props = ["mail.smtp.auth":"true"]
   }
}

Some service, for instance Email service:

// Using import aliasing.
import org.codehaus.groovy.grails.commons.ConfigurationHolder 
as confHolder

class EmailService {

   def sendEmail() {
       // Reading property by name.
       def username = confHolder.config.grails.mail.username
   }

}

As You can see its very simple. In order to have access to Grails configuration from controllers or tags use grailsApplication: in our case grailsApplication.config.grails.mail.username. Enjoy!