ConfigurationHolder in grails 2.4.2

ConfigurationHolder class has been removed from grails 2.4.2 

It has been replaced with Holder class

Sample code
def baseUrl = ConfigurationHolder.config.icann.base.url 

is replaced with 
def baseUrl = Holders.config.icann.base.url

Refer :http://grails.org/doc/2.4.2/guide/upgradingFrom23.html  for more information