Question

I created the following annotation:

public @interface NavAnnotation {

    boolean addToAdminMenu() default false;

}

… then try to annotate a domain class:

@NavAnnotation ( addToAdminMenu = true )
class Information {...}

… and do something with that in a controller:

def appDomainClasses = grailsApplication.domainClasses.findAll {
    it.class.isAnnotationPresent( NavAnnotation )

}
[ appDomainClasses : appDomainClasses ]

… but that annotated class is not getting picked up. Any ideas on what I’m missing?

Answer 1

Couple things…

1.) Ensure that your annotation has a retention policy of @Retention(RetentionPolicy.RUNTIME). The RUNTIME retention policy allows the annotation to be available for reflection at runtime. So your interface should look like….

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
public @interface NavAnnotation {
    boolean addToAdminMenu() default false;
}

2.) grailsApplication.domainClasses returns a DefaultGrailsDomainClass and not the actual class you want to preform reflections on. Instead you want to access the underlining class using the getClazz() method like this….

def appDomainClasses = grailsApplication.domainClasses.findAll {
    it.getClazz().isAnnotationPresent( NavAnnotation )

}

I’ve tested to confirm that it works. Enjoy!

-Thanks