Describe the bug
The code example at https://www.graphql-java.com/documentation/scalars/#example-implementation is outdated. It overrides now deprecated methods and if you follow the example stuff breaks. Further analysis is pending, but it seams that introspection queries throw a 400 with an error message like exception text "The non deprecated version of valueToLiteral has not been implemented by this scalar : class org.restheart.graphql.scalars.bsonCoercing.GraphQLBsonBooleanCoercing" or similar, when the Schema has default values defined.

To Reproduce
Use the code from the example, it should fail in a similar way.