Resolve issue because of failing AOP Serialization test

src/Spring/Spring.Core/Objects/Factory/Attributes/QualifierAnnotationAutowireCandidateResolver.cs

@@ -34,6 +34,7 @@ namespace Spring.Objects.Factory.Attributes
     /// against <see cref="QualifierAttribute"/> on the field or parameter to be autowired.
     /// Also supports suggested expression values through a <see cref="ValueAttribute"/> attribute.
     /// </summary>
+    [Serializable]
     public class QualifierAnnotationAutowireCandidateResolver : IAutowireCandidateResolver, IObjectFactoryAware
     {
         private IObjectFactory _objectFactory;

src/Spring/Spring.Core/Objects/ObjectMetadataAttributeAccessor.cs

@@ -18,6 +18,7 @@
 
 #endregion
 
+using System;
 using Spring.Core;
 
 namespace Spring.Objects
@@ -27,6 +28,7 @@ namespace Spring.Objects
     /// holding attributes as <see cref="IObjectMetadataElement"/> objects in order
     /// to keep track of the definition source.
     /// </summary>
+    [Serializable]
     public class ObjectMetadataAttributeAccessor : AttributeAccessorSupport, IObjectMetadataElement
     {
 	    private object _source;