为什么返回 null 的字符串为 java.lang.Object@.？

Question

我的理解是 null 是 graphql 响应中可接受的值。所以我一定是误解了某些东西，或者我做的事情根本上是错误的，因为现在我得到的是 "java.lang.Object@7deb1b9" 而不是 null.

schema {
  query: Query
}

type Query {
  greeting: String
}

Graphql 看起来像这样：

        final Builder vContextBuilder = new Builder()
                .of("locale", mLocale)
                .of("securityContext", mSecurityContext);

        final ExecutionInput vExecutionInput = ExecutionInput
                .newExecutionInput()
                .query(mQuery)
                .context(vContextBuilder)
                .build();

        final InputStream vSchemaInputStream = Thread
                .currentThread()
                .getContextClassLoader()
                .getResourceAsStream(SCHEMA_FILE_URI);

        final TypeDefinitionRegistry vTypeDefinitionRegistry = new SchemaParser()
                .parse(new InputStreamReader(vSchemaInputStream));

        final RuntimeWiring vRuntimeWiring = RuntimeWiring.newRuntimeWiring()
                .type("Query", typeWiring -> typeWiring
                        .dataFetcher("greeting", new GreetingFetcher())
                        )
                .build();

        final GraphQLSchema vGraphQLSchema = new SchemaGenerator()
                .makeExecutableSchema(vTypeDefinitionRegistry, vRuntimeWiring);

        final GraphQL vGraphQL = GraphQL.newGraphQL(vGraphQLSchema)
                .build();

        final ExecutionResult vExecutionResult = vGraphQL.execute(vExecutionInput);

        final Map<String, Object> toSpecificationResult = vExecutionResult.toSpecification();

还有 Greetingfetcher：

public class GreetingFetcher extends StaticDataFetcher {

    public GreetingFetcher() {
        super("Hello!");
        //super(null);
    }
}

查询：

query {
  greeting
}

来自super("Hello!");的回复：

{
    "data": {
        "greeting": "Hello!"
    }
}

来自super(null);的回复：

{
    "data": {
        "greeting": "java.lang.Object@7deb1b9"
    }
}

响应不应该是：

{
    "data": {
        "greeting": null
    }
}

有人有什么想法吗？

Answer 1

进口有问题。当我将 Eclipse 更改为 import graphql.GraphQL; 时，Eclipse 添加了 import graphql.nextgen.GraphQL; 一切正常。

为什么返回 null 的字符串为 java.lang.Object@.？

Why is a String that is null returned as java.lang.Object@.?

graphql-java