If you need to register extended scalars with the new Spring Boot GraphQL Starter (see) just provide a custom "RuntimeWiringConfigurer":

Kotlin example:

class GraphQLConfigProvider {
    fun configureGraphQL(): RuntimeWiringConfigurer {
        return object : RuntimeWiringConfigurer {
            override fun configure(builder: RuntimeWiring.Builder) {
                // ...

Register the scalar in your schema:

scalar Date

type XYZ {
date_entry : Date


You need to include the extended Scalars in your POM/Gradle file (mvnrepository):


Happy querying ...