我有一個帶有以下假客戶的項目@FeignClient(name = "name", url = "${tokenService}")public interface TokenService { @RequestMapping(path = "/SLJsonWebTokenWrapper/token/wrap", method = RequestMethod.POST, consumes = MediaType.APPLICATION_JSON_VALUE, produces = MediaType.APPLICATION_JSON_VALUE) Observable<Token> getToken(@RequestHeader("externalSystemCode") String systemCode, @RequestBody TokenRequest tokenRequest);}和以下依賴org.springframework.cloud:spring-cloud-starter-feign一切正常。當我將項目更新為 Spring Boot 2（并使用org.springframework.cloud:spring-cloud-starter-openfeign）時，對此服務的請求因異常而失敗c.f.j.d.e.InvalidDefinitionException: Cannot construct instance of `rx.Observable` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator) at [Source: (ByteArrayInputStream); line: 1, column: 2]at c.f.j.d.e.InvalidDefinitionException.from(InvalidDefinitionException.java:67)at c.f.j.d.DeserializationContext.reportBadDefinition(DeserializationContext.java:1452)at c.f.j.d.DeserializationContext.handleMissingInstantiator(DeserializationContext.java:1028)at c.f.j.d.d.BeanDeserializerBase.deserializeFromObjectUsingNonDefault(BeanDeserializerBase.java:1297)at c.f.j.d.d.BeanDeserializer.deserializeFromObject(BeanDeserializer.java:326)at c.f.j.d.d.BeanDeserializer.deserialize(BeanDeserializer.java:159)at c.f.j.d.ObjectMapper._readMapAndClose(ObjectMapper.java:4013)at c.f.j.d.ObjectMapper.readValue(ObjectMapper.java:3084)... 1 frames excluded... 99 common frames omittedWrapped by: o.s.h.c.HttpMessageConversionException: Type definition error: [simple type, class rx.Observable]; nested exception is com.fasterxml.jackson.databind.exc.InvalidDefinitionException: Cannot construct instance of `rx.Observable` (no Creators, like default construct, exist): cannot deserialize from Object value (no delegate- or property-based Creator)我該如何解決？PS 這個問題類似于Spring cloud netflix 和 HystrixObservable --> JsonMappingException，雖然沒有答案
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TA貢獻1824條經驗 獲得超8個贊
當您將 Feign 依賴項更改為：
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-openfeign</artifactId>
<version>2.1.0.RELEASE</version>
您的 Feign 客戶端的注釋也將更改為例如：
@FeignClient(name = "your-service-name", configuration = FeignConfig.class)
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