Spring Data REST - Consumes Entity List, Java HATEOAS Client

Question

I am using Spring Data REST 2.5.1, Jackson 2.8.0, Spring Boot 1.3.6.

I am trying to get a simple list of entities from my repository via RestTemplate. I can get to the endpoint in the browser and get the expected HAL data. Getting a single Entity works just fine, as shown below. They all use the default SDR endpoints (for example, localhost: {port} / myEntity).

    ResponseEntity<Resource<MyEntity>> responseEntity =
    new RestTemplate()
        .exchange(
        uri + "/1",
            HttpMethod.GET,
            HttpEntity.EMPTY,
        new ParameterizedTypeReference<Resource<MyEntity>>() {}, port
        )

Or new RestTemplate (). getForEntity (uri + "/ 1", MyEntity.class, port)

As many SO questions show, finding examples of list retrieval is a problem. I tried ParameterizedTypeReferenceto Resources, Resource, MyEntity, array, List. All without luck.

        ResponseEntity<Resources<Resource<MyEntity>>> responseEntity =
            new RestTemplate()
                    .exchange(
                    uri,
                    HttpMethod.GET,
                    HttpEntity.EMPTY,
                    new ParameterizedTypeReference<Resources<Resource<MyEntity>>>() {}
            , port
            )

, , Resources, Resource, List<MyEntity>, MyEntity .., ResponseEntity . :

<200 OK,Resources { content: [], links: [] },{Server=[Apache-Coyote/1.1], Content-Type=[application/json;charset=UTF-8], Transfer-Encoding=[chunked], Date=[...]}>

JSON .

{
"_embedded" : {
"myEntities" : [ ... ]
},
"_links" : {
"self" : {
  "href" : "http://localhost:8080/myEntity"
},
"profile" : {
  "href" : "http://localhost:8080/profile/myEntity"
},
"search" : {
  "href" : "http://localhost:8080/myEntity/search"
}
},
"page" : {
  "size" : 20,
  "totalElements" : 10,
  "totalPages" : 1,
  "number" : 1
 }
}

:

@RepositoryRestResource(collectionResourceRel = "myEntities", path = "myEntity")
public interface MyEntityRepository extends PagingAndSortingRepository<MyEntity, Long>
, QueryDslPredicateExecutor<MyEntity>
, QuerydslBinderCustomizer<QMyEntity> { }

, ?

Answer 1

, .

• spring -hateoas: 0.20.0.RELEASE 0.19.0. spring -hateoas: 0.19.0 jackson 2.7+, .

• , , .

  ObjectMapper mapper = builder.build()
  MappingJackson2HttpMessageConverter messageConverter = new MappingJackson2HttpMessageConverter();
  
  messageConverter.setSupportedMediaTypes(MediaType.parseMediaTypes("application/hal+json"))
  messageConverter.setObjectMapper(mapper)
  
  ResponseEntity<PagedResources<MyEntity>> responseEntity =
          new RestTemplate(Arrays.asList(messageConverter))
                  .exchange(
                  uri,
                  HttpMethod.GET,
                  HttpEntity.EMPTY,
                  new ParameterizedTypeReference<PagedResources<MyEntity>>() {}, port
          )
  

PagedResources :

<200 OK,PagedResource { content: [{<List of MyEntities>}], metadata: Metadata { number: 0, total pages: 1, total elements: 10, size: 20 }, links: [<List of hateoas links for MyEntities>] },{Server=[Apache-Coyote/1.1], Content-Type=[application/hal+json;charset=UTF-8], Transfer-Encoding=[chunked], Date=[Thu, 21 Jul 2016 14:57:18 GMT]}>

@zeroflagL PagedResources, "!". blog.

, RestTemplate accept application/hal+json. application/x-spring-data-compact+json;charset=UTF-8, . Resources. MediaType, , .