SpringBoot GraphQL mutation giving error No Root resolvers for query type 'Query' found

Question

Am getting the error No Root resolvers for query type 'Query' found when using mutation in SpringBoot with GraphQL. The queries are working fine , but on adding the GraphQLMutationResolver, it is giving the error on Spring Boot startup.

Kindly advise.

.graphqls file

type Query {
    allBooks: [Book]
    getBookByIsn(isn: Int): Book
    allPublishers: [Publisher]
}

type Book {
    isn: Int
    title: String
    author: String
    publishedDate: String
    publisher: Publisher!
}

type Publisher {
    pId : Int
    publisherName: String
    address: String
}

input CreatePublisher {
    pId : Int
    publisherName: String
    address: String
}


type Mutation {
    addPublisher(input: CreatePublisher!): Publisher
}

Mutation Resolver

@Component
public class PublisherMutation implements GraphQLMutationResolver{
    
    @Autowired
    private PublisherRepository publisherRepository;
    
    @Transactional
    public Publisher addPublisher(CreatePublisher createPublisher ) {
        Publisher publisher = new Publisher(createPublisher.getPId(), createPublisher.getPublisherName(), createPublisher.getAddress());
        publisherRepository.save(publisher);
        return publisher;
        
    }

}

Answer 1

Done, solved by adding a newTypeWiring of type Mutation for Create