GraphQL-java: Error:内省结果缺少接口

Question

我刚刚开始使用GraphQL，我在让它工作时遇到了一些问题。无论我有什么样的模式，我都会得到Error: Introspection result missing interfaces。

模式：

schema {
    query: Query
}

type Query {
    dd: String
}

GraphiQL的结果：

Error: Introspection result missing interfaces: {"kind":"OBJECT","name":"Query","fields":[{"name":"dd","type":{"kind":"SCALAR","name":"String"},"isDeprecated":false}]}
    at E (file:///C:/Program%20Files/GraphiQL/resources/app.asar/dist/bundle.js:32:22809)
    at _ (file:///C:/Program%20Files/GraphiQL/resources/app.asar/dist/bundle.js:32:22340)
    at r (file:///C:/Program%20Files/GraphiQL/resources/app.asar/dist/bundle.js:32:21822)
    at file:///C:/Program%20Files/GraphiQL/resources/app.asar/dist/bundle.js:32:25249
    at Array.map (native)
    at i (file:///C:/Program%20Files/GraphiQL/resources/app.asar/dist/bundle.js:32:25226)
    at file:///C:/Program%20Files/GraphiQL/resources/app.asar/dist/bundle.js:26:30839
    at process._tickCallback (internal/process/next_tick.js:103:7)

不管我更改了什么，我仍然会得到这个错误，只是当我更改变量名时它引用了不同的位置。有什么我误解了吗？

我在Spring中使用graphql，设置非常基本：

@RestController
public class GraphQLEndpoint {

    @Autowired
    private GraphQL graphQL;

    @PostMapping(path = "/graphql", consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_UTF8_VALUE)
    Map<String, Object> graphql(@RequestBody GraphQLRequest request, WebRequest webRequest) throws ExecutionException, InterruptedException, JsonProcessingException {
        val query = nonNull(request.getQuery()) ? request.getQuery() : "";
        val variables = (Map<String, Object>) (nonNull(request.getVariables()) ? request.getVariables() : emptyMap());

        val executionInput = ExecutionInput.newExecutionInput()
                .query(query)
                .operationName(request.getOperationName())
                .variables(variables)
                .build();

        return graphQL.execute(executionInput).toSpecification();
    }
}

@Configuration
public class GraphQLConfig {

    @Bean
    GraphQL graphQL(@Value("${classpath:schemas/pdl.graphqls}") ClassPathResource schemaFile) throws IOException {
        val typeRegistry = new SchemaParser().parse(schemaFile.getFile());
        val runtimeWiring = RuntimeWiring.newRuntimeWiring()
                .type(typeRuntimeWiring())
                .build();
        val schema = new SchemaGenerator().makeExecutableSchema(typeRegistry, runtimeWiring);
        return GraphQL.newGraphQL(schema).build();
    }

    private TypeRuntimeWiring typeRuntimeWiring() {
        return TypeRuntimeWiring.newTypeWiring("Query")
                .dataFetcher("dd", environment -> "test")
                .build();
    }
}

Answer 1

我在杰克逊的属性中忽略了non_empty列表，这使得GraphiQL和牛市抛出和异常。

Answer 2

当响应中缺少GraphiQL所期望的接口属性时，就会出现此问题。

当使用具有适当配置的graphql-java-servlet定义GraphQLObjectMapper时，可以帮助避免将序列化属性设置为JsonInclude.Include.NON_NULL，从而存在接口属性。

   @Bean
   public GraphQLObjectMapper graphQLObjectMapper() {
       return GraphQLObjectMapper.newBuilder()
               .withObjectMapperProvider(ObjectMapper::new)
               .build();
   }