Uninformative error message (stack trace) when adding a custom annotation

Adding the Gaelyk annotation @Entity results in a stack trace during compilation. In addition, no informative message is given as to which groovy file caused the issue.

At the very least, a more explicative message (not a stack trace) should be given to the user as well as informing the user which file could not be compile.

In a more general case, any stack trace that is thrown should have a message included with it stating the offending file name.

Example:

@Entity
class Favorite {
    Date created
}