使用RestTemplae提取vavr Multimap后的反序列化错误

Question

我正在尝试反序列化Jackson Multimap

       //given
        val newUser = NewUserDTO(ALREADY_TAKEN_USERNAME, ALREADY_TAKEN_EMAIL,"qddqwdW221QZ&^$!")

        //when
        val response = restTemplate.exchange("http://localhost:${port}/user", HttpMethod.POST, HttpEntity(newUser), typeReference())

        //then
        Assertions.assertEquals(HttpStatus.UNPROCESSABLE_ENTITY, response.statusCode)

我得到一个例外：

Type definition error: [simple type, class io.vavr.collection.Multimap]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `io.vavr.collection.Multimap` (no Creators, like default constructor, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
 at [Source: (PushbackInputStream); line: 1, column: 1]
org.springframework.http.converter.HttpMessageConversionException: Type definition error: [simple type, class io.vavr.collection.Multimap]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `io.vavr.collection.Multimap` (no Creators, like default constructor, exist): abstract types either need to be mapped to concrete types, have custom deserializer, or contain additional type information
 at [Source: (PushbackInputStream); line: 1, column: 1]

有趣的是，如果我使用String保持响应值并使用注入的ObjectMapper，我可以反序列化响应我该怎么办？

Answer 1

如果需要自定义（例如添加其他消息转换器），请使用RestTemplateBuilder @Bean。

我假设RestTemplateBuilder使用相同的RestTemplate，因此，如果为RestTemplate注册了一个模块，则应该为RestTemplateBuilder注册一个模块