我有一个通过 spring-data-rest 公开资源的服务器,据我所知,它使用 HAL 或 HATEOAS。但是当我尝试将它与 Feign 结合使用时,我似乎无法注册一个被拾取的 Jackson2HalModule 。
我需要做些什么才能将 Feign“客户端”连接到新转换器吗?它是否使用了我这里使用的另一个 ObjectMapper?
Code:
@Inject
public void configureObjectMapper(ObjectMapper mapper, RestTemplate template) {
mapper.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
mapper.registerModule(new Jackson2HalModule());
MappingJackson2HttpMessageConverter converter = new MappingJackson2HttpMessageConverter();
converter.setSupportedMediaTypes(MediaType.parseMediaTypes("application/hal+json"));
converter.setObjectMapper(mapper);
template.getMessageConverters().add(converter);
}
服务器响应:
{
"_links" : {
"self" : {
"href" : "http://localhost:13372/user{?page,size,sort}",
"templated" : true
},
"search" : {
"href" : "http://localhost:13372/user/search"
}
},
"_embedded" : {
"user" : [ {
"id" : "5567613e5da543dba4201950",
"version" : 0,
"created" : "2015-05-28T18:41:02.685Z",
"createdBy" : "system test",
"edited" : "2015-05-28T18:41:02.713Z",
"editedBy" : "system test",
"username" : "devuser",
"email" : "[email protected] /cdn-cgi/l/email-protection",
"roles" : [ "USER" ],
"_links" : {
"self" : {
"href" : "http://localhost:13372/user/5567613e5da543dba4201950"
}
}
} ]
},
"page" : {
"size" : 20,
"totalElements" : 1,
"totalPages" : 1,
"number" : 0
}
}
例外:
Caused by: com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
at [Source: java.io.PushbackInputStream@7b6c6e70; line: 1, column: 1]
at com.fasterxml.jackson.databind.JsonMappingException.from(JsonMappingException.java:148)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:762)
at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:758)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.handleNonArray(CollectionDeserializer.java:275)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:216)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:206)
at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:25)
at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:3066)
at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2221)
at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.readJavaType(AbstractJackson2HttpMessageConverter.java:205)