fix for GRAILS-4446

grails/src/java/org/codehaus/groovy/grails/commons/DefaultGrailsDomainClassProperty.java

@@ -21,6 +21,7 @@
 import org.apache.commons.logging.LogFactory;
 import org.codehaus.groovy.grails.exceptions.GrailsDomainException;
 import org.codehaus.groovy.grails.validation.ConstrainedProperty;
+import org.codehaus.groovy.grails.plugins.DomainClassGrailsPlugin;
 import org.springframework.validation.Validator;
 
 import java.beans.IntrospectionException;
@@ -512,6 +513,7 @@ public ComponentDomainClass(Class type) {
             this.properties = createDomainClassProperties(this,descriptors);
             try {
                 this.constraints = GrailsDomainConfigurationUtil.evaluateConstraints(getReference().getWrappedInstance(), properties);
+                DomainClassGrailsPlugin.registerConstraintsProperty(getMetaClass(), this);
             } catch (IntrospectionException e) {
                 LOG.error("Error reading embedded component ["+getClazz()+"] constraints: " +e .getMessage(), e);
             }

grails/src/java/org/codehaus/groovy/grails/plugins/DomainClassGrailsPlugin.groovy

@@ -93,13 +93,7 @@ class DomainClassGrailsPlugin {
         def metaClass = dc.metaClass
         def domainClass = dc
 
-        metaClass.'static'.getConstraints = {->
-            domainClass.constrainedProperties
-        }
-
-        metaClass.getConstraints = {->
-            domainClass.constrainedProperties
-        }
+        registerConstraintsProperty(metaClass, domainClass)
 
         metaClass.hasErrors = {-> delegate.errors?.hasErrors() }
 
@@ -155,6 +149,19 @@ class DomainClassGrailsPlugin {
         }
     }
 
+    /**
+     * Registers the constraints property for the given MetaClass and domainClass instance
+     */
+    static def registerConstraintsProperty(MetaClass metaClass, GrailsDomainClass domainClass) {
+        metaClass.'static'.getConstraints = {->
+            domainClass.constrainedProperties
+        }
+
+        metaClass.getConstraints = {->
+            domainClass.constrainedProperties
+        }
+    }
+
 
     private static addRelationshipManagementMethods(GrailsDomainClass dc) {
         def metaClass = dc.metaClass

grails/src/test/org/codehaus/groovy/grails/web/binding/BindToObjectWithEmbeddableTests.groovy

@@ -0,0 +1,66 @@
+package org.codehaus.groovy.grails.web.binding
+
+import org.codehaus.groovy.grails.web.servlet.mvc.AbstractGrailsControllerTests
+
+/**
+ * @author Graeme Rocher
+ * @since 1.1
+ */
+
+public class BindToObjectWithEmbeddableTests extends AbstractGrailsControllerTests{
+
+    protected void onSetUp() {
+        gcl.parseClass('''
+import grails.persistence.*
+
+@Entity
+class Person {
+
+    static embedded = ['address']
+
+    String name
+    int age
+    Address address = new Address()
+
+}
+
+class Address {
+    String street
+    String street2
+    String city
+    String state
+    String zip
+
+    static constraints = {
+        street2(nullable:true)
+    }
+}
+
+class PersonController {
+
+    def save = {
+        def p = new Person(params)
+        [person:p]
+    }
+}
+
+''')
+    }
+
+
+    void testBindToObjectWithEmbedded() {
+        def controller = ga.getControllerClass("PersonController").newInstance()
+
+        controller.params.name = "Joe"
+        controller.params.age= "45"
+        controller.params.'address.city' = 'Brighton'
+
+        def model = controller.save()
+
+        assertEquals "Joe", model.person.name
+        assertEquals 45, model.person.age
+        assertEquals "Brighton", model.person.address.city
+
+    }
+
+}