Check for annotation present on superclass field

I have problems to check if a persistent property in grails has an specific annotation for fields that belong to superclass ... ane then get it's name and value.

I am getting the persistence properties as:

GrailsDomainClassProperty[] persistentProperties = new DefaultGrailsDomainClass(entityClass).getPersistentProperties();

That works great ... but later i found that getDeclaredFields only retrieves the actual class fields (not superclass) and things starts to look not very Groovy.

Is there a prefered Groovy way to do this?