anchor.diff:  some additional steps that are detailed here. Let's say we have the following user classes:
   
   .Author.java
  +[source,java]
   ----
   public class Author {
      private final String name;
  
positive.code: ----
  
  .Book.java
  ----
  public class Book {
     private final String title;
  
negative.code: NOTE: The type name must match the `<protobuf package>.<protobuf message>` exactly!
  +
  .AuthorMarshaller.java
  [source,java]
  ----
  public class AuthorMarshaller implements MessageMarshaller<Author> {
  
  