Question

我正在使用Spring Data JPA存储库运行Spring Boot 1.5.1。我已经在我的用户存储库中添加了一个方法，该方法使用了JPA投影（UserProfile），它非常有用。我现在希望在我的服务层中缓存该方法的结果，该层应该返回类型为Page＆lt;的结果。 UserProfile＆gt;如图所示

JPA Projection。

public interface UserProfile extends Serializable {

    long getId();

    @Value("#{target.firstname} #{target.othernames}")
    String getFullName();

    String getFirstname();

    String getOthernames();

    String getGender();

    String getEnabled();

    @Value("#{T(System).currentTimeMillis()-target.birthday.getTime()}")
    long getBirthday();

}

用户实体。

@Entity
@Cacheable(true)
@Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
public class User implements Serializable {

    private static final long serialVersionUID = 6756059251848061768L;

    @Id
    @GeneratedValue(strategy=GenerationType.AUTO)
    private long id;        
    @Column
    private String firstname;       
    @Column
    private String othernames;
    @Column
    private String gender;
    @Column
    private String photoname;
    @Column
    private Date birthday;
    @Column
    private String username;
    @Column
    private Boolean enabled;
    @Column 
    private String password;

    @ElementCollection
    private Map<String,String> phonenumbers = new HashMap<String,String>(0);

    @JsonBackReference
    @OneToMany(cascade = CascadeType.ALL, orphanRemoval=true)
    @Cache(usage = CacheConcurrencyStrategy.READ_WRITE)
    private List<Address> addresses = new ArrayList<Address>(0);

    //Omitted Getters and Setters 

    @Override
    public int hashCode() {...}

    @Override
    public boolean equals(Object obj) {...}


}

用户存储库。

@Repository
public interface UserRepository extends JpaRepository<User, Long> {

    public Page<UserProfile> findAllUserProfilesBy(Pageable pageable);

}

用户服务实施。

@Service
@Transactional(readOnly=true)
public class UserServiceImpl implements UserService {

    @Autowired
    UserRepository UserRepository;

    @Override
    @Cacheable("users")
    public Page<UserProfile> findAllUserProfiles(Pageable pageable) {
        //simulateSlowService();
        return UserRepository.findAllUserProfilesBy(pageable);
    }   

}

然而，当调用服务方法时，我得到以下异常。

java.lang.RuntimeException: Class org.springframework.data.projection.DefaultMethodInvokingMethodInterceptor does not implement Serializable or externalizable

我应该如何缓存服务方法的结果？非常感谢任何帮助。

如何缓存Spring Data JPA Projections

0 个答案: