diff --git a/engine/src/networking/com/jme3/network/serializing/Serializer.java b/engine/src/networking/com/jme3/network/serializing/Serializer.java
index b3408f4da..520302806 100644
--- a/engine/src/networking/com/jme3/network/serializing/Serializer.java
+++ b/engine/src/networking/com/jme3/network/serializing/Serializer.java
@@ -293,8 +293,7 @@ public abstract class Serializer {
         }            
         
         if( failOnMiss ) {
-            Logger.getLogger(Serializer.class.getName()).log(Level.WARNING, "Class has not been registered {0}", cls);
-//            throw new IllegalArgumentException( "Class has not been registered:" + cls );
+            throw new IllegalArgumentException( "Class has not been registered:" + cls );
         }
         return registerClass(cls, fieldSerializer);
     }
diff --git a/engine/src/networking/com/jme3/network/serializing/serializers/FieldSerializer.java b/engine/src/networking/com/jme3/network/serializing/serializers/FieldSerializer.java
index e39ecc4a2..01c24c454 100644
--- a/engine/src/networking/com/jme3/network/serializing/serializers/FieldSerializer.java
+++ b/engine/src/networking/com/jme3/network/serializing/serializers/FieldSerializer.java
@@ -72,7 +72,20 @@ public class FieldSerializer extends Serializer {
             SavedField cachedField = new SavedField();
             cachedField.field = field;
 
-            if (Modifier.isFinal(field.getType().getModifiers())) cachedField.serializer = Serializer.getSerializer(field.getType());
+            if (Modifier.isFinal(field.getType().getModifiers())) {
+                // The type of this field is implicit in the outer class
+                // definition and because the type is final, it can confidently
+                // be determined on the other end.
+                // Note: passing false to this method has the side-effect that field.getType()
+                // will be registered as a real class that can then be read/written
+                // directly as any other registered class.  It should be safe to take
+                // an ID like this because Serializer.initialize() is only called 
+                // during registration... so this is like nested registration and
+                // doesn't have any ordering problems.
+                // ...well, as long as the order of fields is consistent from one
+                // end to the next. 
+                cachedField.serializer = Serializer.getSerializer(field.getType(), false);
+            }                
 
             cachedFields.add(cachedField);
         }