Graphql java spring boot -- Scalar type error -- There is no scalar implementation for the named 'XXX' scalar type

Question

I want to make scalar type it will report an error Even I use extended-scalars, It did not work at all.

• Version:

spring-boot: 2.7.0

    <dependency>
        <groupId>com.graphql-java-kickstart</groupId>
        <artifactId>graphql-spring-boot-starter</artifactId>
        <version>12.0.0</version>
    </dependency>
    <dependency>
        <groupId>com.graphql-java-kickstart</groupId>
        <artifactId>graphql-java-tools</artifactId>
        <version>12.0.0</version>
    </dependency>
    <dependency>
        <groupId>com.graphql-java</groupId>
        <artifactId>graphiql-spring-boot-starter</artifactId>
        <version>5.0.2</version>
    </dependency>

• Code

@Configuration
public class Conf {

    @Bean
    public GraphQLScalarType graphQLLong() {
        return ExtendedScalars.GraphQLLong;
    }
}

Caused by: SchemaProblem{errors=[There is no scalar implementation for the named  'Long' scalar type]}

• Schema structure (a very simple one)

scalar Long

type Mutation {

}

• yml config

So what config was I lost?

Answer 1

Include graphql-java-extended-scalars dependency:

https://github.com/graphql-java/graphql-java-extended-scalars

And make sure in your @Configuration class you are using:

@Bean
public graphql.schema.GraphQLScalarType extendedScalarLong() {
    return graphql.scalars.ExtendedScalars.GraphQLLong;
}

Also, if you are defining your ExtendedScalar as a @Bean, then there's no need to specify it in graphql.extended-scalars property.