I developed a plugin to generate the code CustomFieldSerializer,
thanks to the suggestion of @ GenSerializer by Flori, the idea is to
use it as follows:
@GenSerializer
public class CategoryItem {
   List<Product> productKey;
   int quantity;
   ....
}

result of the generated code:
public class CategoryItem_CustomFieldSerializer {
  @SuppressWarnings("unchecked")
  public static void deserialize(SerializationStreamReader reader,
CategoryItem instance) throws SerializationException {
instance.setProductKey((java.util.List<com.pe.sondx.shared.entities.Product
>)reader.readObject());

       instance.setQuantity(reader.readInt());
  }
  public static void serialize(SerializationStreamWriter writer,
CategoryItem instance) throws SerializationException {
       if (instance.getProductKey() == null) {
          writer.writeObject(new
java.util.ArrayList<com.pe.sondx.shared.entities.Product>());
       } else {
          writer.writeObject(new
java.util.ArrayList<com.pe.sondx.shared.entities.Product>(instance.getProdu
ctKey()));
       }
       writer.writeInt(instance.getQuantity());
  }
}

Here you can download:
http://code.google.com/p/gwtserializer-processors/

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