Tidying imports etc to remove compiler warnings.

samples/contacts/src/main/java/sample/contact/AddPermissionValidator.java

@@ -30,6 +30,7 @@ import org.springframework.validation.Validator;
 public class AddPermissionValidator implements Validator {
     //~ Methods ========================================================================================================
 
+    @SuppressWarnings("unchecked")
     public boolean supports(Class clazz) {
         return clazz.equals(AddPermission.class);
     }

samples/contacts/src/main/java/sample/contact/WebContactValidator.java

@@ -28,6 +28,7 @@ import org.springframework.validation.Validator;
 public class WebContactValidator implements Validator {
     //~ Methods ========================================================================================================
 
+    @SuppressWarnings("unchecked")
     public boolean supports(Class clazz) {
         return clazz.equals(WebContact.class);
     }