package de.scheelethek.backoffice.crud class CommentController { def scaffold = true }I've got a runtime exception like
2010-10-10 13:11:44,417 [http-8080-1] ERROR errors.GrailsExceptionResolver - java.lang.Boolean cannot be cast to groovy.lang.Closure java.lang.ClassCastException: java.lang.Boolean cannot be cast to groovy.lang.Closure at java.lang.Thread.run(Thread.java:619)
It looks like Grails is trying to interpret the scaffold-definition as an action.
The explanation was not far to seek:
The referenced domain class is defined in the package "de.scheelethek.backoffice". The controller uses another package definition. scaffold=true is searching just in the same package for a corresponding domain definition. If not found "def scaffold", it is interpreted as an action.
The solution is obvious. Do an explicit definition of the domain class that should be used:
package de.scheelethek.backoffice.crud import de.scheelethek.content.* class CommentController { def scaffold = Comment }