anchor.diff:  
   First, you must configure the `GraphQL` object to use the `DataLoaderDispatcherInstrumentation`:
   
  -[source,java]
  +[source,$lang]
   ----
   {@link examples.GraphQLExamples#dataLoaderDispatcherInstrumentation}
   ----
   
   Then create a batch loader:
   
  -[source,java]
  +[source,$lang]
   ----
   {@link examples.GraphQLExamples#createBatchLoader}
   ----
  
positive.code: 
  Eventually, configure the {@link io.vertx.ext.web.handler.graphql.GraphQLHandler} to create a `DataLoaderRegistry` for each request:
  
  [source,java]
  ----
  {@link examples.GraphQLExamples#dataLoaderRegistry}
  ----
  
negative.code: 
  If you don't need (or don't wish to) use a domain object layer, you can configure GraphQL-Java to use {@link io.vertx.ext.web.handler.graphql.VertxPropertyDataFetcher} instead:
  
  [source,$lang]
  ----
  {@link examples.GraphQLExamples#jsonData}
  ----
  