How to access Grails configuration in Grails 2.0?

Question

I have obtained the latest Grails 2.0 milestone, and I am seeing a deprecation warning for the ConfigurationHolder class:

org.codehaus.groovy.gr         


        

Answer 1

• If you need it in an artifact that supports dependency injection, simply inject grailsApplication

  class MyController {
      def grailsApplication
  
      def myAction = {
          def bar = grailsApplication.config.my.property
      }
  }
  

• If you need it in a bean in, say, src/groovy or src/java, wire it up using conf/spring/resources.groovy

  // src/groovy/com/example/MyBean.groovy
  class MyBean {
      def grailsApplication
  
      def foo() {
          def bar = grailsApplication.config.my.property
      }
  }
  
  // resources.groovy
  beans = {
      myBean(com.example.MyBean) {
          grailsApplication = ref('grailsApplication')
          // or use 'autowire'
      }
  }
  

• Anywhere else, it's probably easiest to either pass the configuration object to the class that needs it, or pass the specific properties that are needed.

  // src/groovy/com/example/NotABean.groovy
  class NotABean {
      def foo(def bar) {
         ...
      }
  }
  
  // called from a DI-supporting artifact
  class MyController {
      def grailsApplication
      def myAction = {
          def f = new NotABean()
          f.foo(grailsApplication.config.my.property)
      }
  }
  

Update:

Burt Beckwith recently wrote a couple of blog posts on this. One discusses using getDomainClass() from within domain classes, while the other offers the option of creating your own holder class (if none of the solutions above are appropriate).