GraphQL Schema Definition Language support in graphql-java

Question

Hi I'm new to graphql specially graphql-java .

Is there any possible way to use GraphQL Schema Definition Language support in graphql-java? If yes then how it is possible?

Answer 1

Yes, it is possible since release 3.0.0.

schema {
    query: QueryType
}

type QueryType {
    hero(episode: Episode): Character
    human(id : String) : Human
    droid(id: ID!): Droid
}

You can convert an the following IDL-File (starWarsSchema.graphqls) to an executable schema like this:

SchemaParser schemaParser = new SchemaParser();
SchemaGenerator schemaGenerator = new SchemaGenerator();

File schemaFile = loadSchema("starWarsSchema.graphqls");

TypeDefinitionRegistry typeRegistry = schemaParser.parse(schemaFile);
RuntimeWiring wiring = buildRuntimeWiring();
GraphQLSchema graphQLSchema = schemaGenerator.makeExecutableSchema(typeRegistry, wiring);

Also you have to implement the buildRuntime function to wire your static schema with the resolvers.

RuntimeWiring buildRuntimeWiring() {
    return RuntimeWiring.newRuntimeWiring()
            .scalar(CustomScalar)
            .type("QueryType", typeWiring -> typeWiring
                    .dataFetcher("hero", new StaticDataFetcher(StarWarsData.getArtoo()))
                    .dataFetcher("human", StarWarsData.getHumanDataFetcher())
                    .dataFetcher("droid", StarWarsData.getDroidDataFetcher())
            )
            .build();
}

A more detailed example you can find in the graphql-java documentation.