Documentation includes deprecated code

[ataylormays-duetto]

Description

https://www.graphql-java-kickstart.com/tools/directives/ includes the following code:

public class UppercaseDirective implements SchemaDirectiveWiring{
 @Override
 public GraphQLFieldDefinition onField(SchemaDirectiveWiringEnvironment<GraphQLFieldDefinition> env){
 GraphQLFieldDefinition field = env.getElement();
 GraphQLFieldsContainer parentType = env.getFieldsContainer();

 // build a data fetcher that transforms the given value to uppercase
 DataFetcher originalFetcher = env.getCodeRegistry().getDataFetcher(parentType, field);
 DataFetcher dataFetcher =
 DataFetcherFactories.wrapDataFetcher(
 originalFetcher,
 ((dataFetchingEnvironment, value) ->{
 if (value instanceof String){
 return ((String) value).toUpperCase();
 }
 return value;
 }));

 // now change the field definition to use the new uppercase data fetcher
 env.getCodeRegistry().dataFetcher(parentType, field, dataFetcher);
 return field;
 }
}

However, DataFetcher originalFetcher = env.getCodeRegistry().getDataFetcher(parentType, field); is a deprecated method, which has now been removed in the latest v22 of graphql-java: https://github.com/graphql-java/graphql-java/pull/3514/files.

Expected behavior

The documentation is updated to show how to implement directives w/ the latest version of graphql-java.

Actual behavior

The documentation uses outdated code that is incompatible with the latest version of graphql-java.