Upgrade to 2.4.x

[abdennour]

The following deprecated classes have been removed from Grails 2.4.x:

org.codehaus.groovy.grails.commons.ApplicationHolder
org.codehaus.groovy.grails.commons.ConfigurationHolder
org.codehaus.groovy.grails.plugins.PluginManagerHolder
org.codehaus.groovy.grails.web.context.ServletContextHolder
org.codehaus.groovy.grails.compiler.support.GrailsResourceLoaderHolder

If you or any plugins you have installed are using these classes you will get a compilation error. The problem can be rectified by updating to new plugins and using grails.util.Holders instead.

For example

application = org.codehaus.groovy.grails.commons.ApplicationHolder.application

to

application = Holders.grailsApplication