How to dynamically select a service in Grails
ctx."${beanName}" is added to the ApplicationContext metaclass so you can do stuff like def userService = ctx.userService. It's just a shortcut for ctx.getBean('userService') so you could change your code to
return ctx.getBean(beanName)and it would be the same, but less magical.
Since you're calling this from a controller or a service, I'd skip the ServletContextHolder stuff and get the context by dependency-injecting the grailsApplication bean (def grailsApplication) and getting it via def ctx = grailsApplication.mainContext. Then pass it into this helper class (remember the big paradigm of Spring is dependency injection, not old-school dependency-pulling) and then it would be simply
class Resolver { def getBean(ctx, String beanName) { ctx.getBean(beanName) }}But then it's so simple that I wouldn't bother with the helper class at all :)