为什么没有使用Spring Data JPA设置版本属性？ [英] Why is the version property not set with Spring Data JPA?

问题描述

想知道如何在用于ETag的Spring Data REST中使用 @Version 注释，我没有看到ETag由于某种原因填充

Wanted to know how is @Version annotation in Spring Data REST put to use for ETags, I do not see the ETags populated for some reason

@Entity
@EntityListeners(AuditingEntityListener.class)
public class Venue implements Serializable {

  private static final long serialVersionUID = -5516160437873476233L;

  private Long id;

  ...
  // other properties

  private Long version;

  private Date lastModifiedDate;

  // getters & setters

  @JsonIgnore
  @LastModifiedDate
  public Date getLastModifiedDate() {
    return lastModifiedDate;
  }

  @Version
  @Column
  public Long getVersion() {
    return version;
  }

根据文档，这应该给我一个Etag值？如图库的片段所示

Going by the docs this should give me an Etag Value? as seen in the snippet from the library

protected HttpHeaders prepareHeaders(PersistentEntity<?, ?> entity, Object value) {

    // Add ETag
    HttpHeaders headers = ETag.from(entity, value).addTo(new HttpHeaders());

    // Add Last-Modified
    AuditableBeanWrapper wrapper = getAuditableBeanWrapper(value);

但是，鉴于实体&在配置之后，我仍然为版本获取null。
我的申请表包含以下内容

however, given the entity & following configuration, I still get a null for Version. My Application has the following

@SpringBootApplication
@EnableEntityLinks
@EnableJpaAuditing
public class GabbarSinghApplication

Rest库如下

@RepositoryRestResource(collectionResourceRel = "venue", path = "venues")
public interface VenueRepository extends JpaRepository<Venue, Long> {

虽然我还没有用标题等测试这些方法，但是一个简单的POST请求在 http：// localhost：8080 / workshops 给出 500 ，因为从获取ETag标头值时出现空指针异常版本属性的值。

While I haven't got to test these methods yet with the headers etc, a simple POST request on http://localhost:8080/workshops gives a 500 because of null pointer exception at getting ETag header value from value of version property.

更新

已移至@ javax.persistence。对于实体的版本，我仍然没有在响应头中获得ETag标头。

Moved to @javax.persistence.Version for the entities, I still do not get an ETag header in the response headers.

这是一个失败的单元测试

Here's a failing unit test

  @Before
  public void setUp() throws Exception {

    XStream xstream = new XStream();
    ObjectInputStream in = xstream.createObjectInputStream(venuesXml.getInputStream());
    leela = (Venue) in.readObject();
    paul = (Venue) in.readObject();
    taj = (Venue) in.readObject();
    LOGGER.debug("Initialised Venues from xml file {}", venuesXml.getFilename());

  }

  @Test
  public void testEtagHeaderIsAutoGeneratedOnResourceCreation() {

    final HttpEntity<Venue> httpEntity = new HttpEntity<Venue>(taj, headers);

    ResponseEntity<ResourceSupport> response = restTemplate.exchange(BASE_LOCATION
        + VENUES_ENDPOINT, HttpMethod.POST, httpEntity,
        new ParameterizedTypeReference<ResourceSupport>() {
        });

    assertTrue("Response should contain ETag header", null != response.getHeaders().getETag());

此断言失败。

推荐答案

使用Spring Data JPA，您需要使用 @ javax.persistence.Version 。 @ org.springframework.data.annotation.Version 是用于其他Spring Data模块的注释。

With Spring Data JPA, you need to use @javax.persistence.Version. @org.springframework.data.annotation.Version is the annotation to use for other Spring Data modules.

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