graphql使用输入类型搜索数据

使用时搜索有问题 Input data 在里面 graphql :

@RestController
@RequestMapping("/api/dictionary/")
@RequiredArgsConstructor(onConstructor = @__(@Autowired))
public class DictionaryController {
    @Value("classpath:items.graphqls")
    private Resource schemaResource;
    private GraphQL graphQL;
    private final DictionaryService dictionaryService;

    @PostConstruct
    public void loadSchema() throws IOException {
        File schemaFile = schemaResource.getFile();
        TypeDefinitionRegistry registry = new SchemaParser().parse(schemaFile);
        RuntimeWiring wiring = buildWiring();
        GraphQLSchema schema = new SchemaGenerator().makeExecutableSchema(registry, wiring);
        graphQL = GraphQL.newGraphQL(schema).build();
    }

private RuntimeWiring buildWiring() {

            DataFetcher<String> fetcher9 = dataFetchingEnvironment ->
            getByInput((dataFetchingEnvironment.getArgument("example")));

        return RuntimeWiring.newRuntimeWiring()
                .type("Query", typeWriting ->
                   typeWriting
                    .dataFetcher("getByInput", fetcher9)
                    )
                .build();
    }


public String getByInput(Character character) {
    return "testCharacter";
}
  }

items.graphqls 文件内容:

type Query {
   getByInput(example: Character): String
}

input Character {
    name: String
}

当要求这样的资源时:

query {
    getByInput (example: {name: "aa"} )
}

字符DTO:

@NoArgsConstructor
@AllArgsConstructor
@Data
public class Character {
    protected String name;
}

我有个错误:

"Exception while fetching data (/getByInput) : java.util.LinkedHashMap cannot be cast to pl.graphql.Character",

查询应该是什么样子?

编辑

如果我改为:

public String getByInput(Object character) 

代码运行良好-但我想转换为工作。