Using referenced String constant as value of Annotation causes compile error

When using a String constant as the value for an annotation groovyc errors out with the following message:

Attribute 'value' should have type java.lang.String but found type java.lang.Object in @SpringBean

I've attached sample code to reproduce. The annotation and PersonDao are regular Java classes, just as was my case when finding the bug. The PersonAction is a Groovy class.