anchor.diff:  
   If you prefer not to expose the routing context to your data fetchers, configure the GraphQL handler to customize the context object:
   
  -[source,java]
  +[source,$lang]
   ----
   {@link examples.GraphQLExamples#customContextInDataFetchingEnvironment}
   ----
  
positive.code: 
  This is where the {@link io.vertx.ext.web.handler.graphql.VertxDataFetcher} can help:
  
  [source,java]
  ----
  {@link examples.GraphQLExamples#vertxDataFetcher}
  ----
  
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}
  ----
  