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GraphqL Java
There is a newer version: 230521-nf-execution
package graphql.schema.idl;

import graphql.PublicApi;
import graphql.Scalars;
import graphql.language.ScalarTypeDefinition;
import graphql.schema.GraphQLScalarType;

import java.util.ArrayList;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;

/**
 * Info on all the standard scalar objects provided by graphql-java
 */
@PublicApi
public class ScalarInfo {

    /**
     * A list of the built-in scalar types as defined by the graphql specification
     */
    public static final List GRAPHQL_SPECIFICATION_SCALARS = new ArrayList<>();

    /**
     * A map of scalar type definitions provided by graphql-java
     */
    public static final Map GRAPHQL_SPECIFICATION_SCALARS_DEFINITIONS = new LinkedHashMap<>();

    static {
        GRAPHQL_SPECIFICATION_SCALARS.add(Scalars.GraphQLInt);
        GRAPHQL_SPECIFICATION_SCALARS.add(Scalars.GraphQLFloat);
        GRAPHQL_SPECIFICATION_SCALARS.add(Scalars.GraphQLString);
        GRAPHQL_SPECIFICATION_SCALARS.add(Scalars.GraphQLBoolean);
        GRAPHQL_SPECIFICATION_SCALARS.add(Scalars.GraphQLID);
    }

    static {
        // graphql standard scalars
        GRAPHQL_SPECIFICATION_SCALARS_DEFINITIONS.put("Int", ScalarTypeDefinition.newScalarTypeDefinition().name("Int").build());
        GRAPHQL_SPECIFICATION_SCALARS_DEFINITIONS.put("Float", ScalarTypeDefinition.newScalarTypeDefinition().name("Float").build());
        GRAPHQL_SPECIFICATION_SCALARS_DEFINITIONS.put("String", ScalarTypeDefinition.newScalarTypeDefinition().name("String").build());
        GRAPHQL_SPECIFICATION_SCALARS_DEFINITIONS.put("Boolean", ScalarTypeDefinition.newScalarTypeDefinition().name("Boolean").build());
        GRAPHQL_SPECIFICATION_SCALARS_DEFINITIONS.put("ID", ScalarTypeDefinition.newScalarTypeDefinition().name("ID").build());

    }

    /**
     * Returns true if the scalar type is a scalar that is specified by the graphql specification
     *
     * @param scalarTypeName the name of the scalar type in question
     *
     * @return true if the scalar type is specified by the graphql specification
     */
    public static boolean isGraphqlSpecifiedScalar(String scalarTypeName) {
        return inList(GRAPHQL_SPECIFICATION_SCALARS, scalarTypeName);
    }

    /**
     * Returns true if the scalar type is a scalar that is specified by the graphql specification
     *
     * @param scalarType the type in question
     *
     * @return true if the scalar type is specified by the graphql specification
     */
    public static boolean isGraphqlSpecifiedScalar(GraphQLScalarType scalarType) {
        return inList(GRAPHQL_SPECIFICATION_SCALARS, scalarType.getName());
    }

    private static boolean inList(List scalarList, String scalarTypeName) {
        return scalarList.stream().anyMatch(sc -> sc.getName().equals(scalarTypeName));
    }

}