Creating a custom scalar type

It's possible to create custom scalar types in GraphQL-Java by creating a new instance of the GraphQLScalarType class. To use a custom scalar with GraphQL Java Tools, add the scalar to your GraphQL schema:

scalar UUID

Then either expose your custom scalar as a bean:

@Component
public class UUIDScalarType extends GraphQLScalarType {

  UUIDScalarType() {
    super("UUID", "UUID value", new Coercing<UUID,String>() {
        // ...
    });
  }

}

or pass it to the parser directly:

SchemaParser.newParser()
    // ...
    .scalars(myUuidScalar)