Also allow identifying a domain class via @ArteFact. Partial fix for apache/grails-data-mapping#620

Author: graemerocher

grails-core/src/main/groovy/org/grails/core/artefact/DomainClassArtefactHandler.java

@@ -15,6 +15,7 @@
  */
 package org.grails.core.artefact;
 
+import grails.artefact.Artefact;
 import grails.core.*;
 import grails.core.support.GrailsApplicationAware;
 import grails.persistence.Entity;
@@ -31,6 +32,7 @@
 import org.grails.validation.ConstraintEvalUtils;
 
 import java.io.IOException;
+import java.lang.annotation.Annotation;
 import java.lang.reflect.Modifier;
 import java.net.URL;
 import java.util.Map;
@@ -152,6 +154,11 @@ private static boolean doIsDomainClassCheck(Class<?> clazz) {
             return true;
         }
 
+        Artefact artefactAnn = clazz.getAnnotation(Artefact.class);
+        if(artefactAnn != null && artefactAnn.value().equals(DomainClassArtefactHandler.TYPE)) {
+            return true;
+        }
+
         Class<?> testClass = clazz;
         while (testClass != null && !testClass.equals(GroovyObject.class) && !testClass.equals(Object.class)) {
             try {