我在Spring Boot 1.5.3.RELEASE中使用Spring Data和JPA， 我有3个实体声明如下： A类：
@Entity
@Table(name = "A")
public class A implements Serializable {
@Id
private String id;
private String attribute1;
private String attribute2;
@Fetch(FetchMode.JOIN)
@ManyToOne
@JoinColumn(name = "B_ID")
private B b;
//Getters et Setters
B组：
@Entity
@Table(name = "B")
public class B implements Serializable {
@Id
private String id;
@Fetch(FetchMode.JOIN)
@ManyToOne
@JoinColumn(name = "C_ID")
private C c;
private String attribute1;
private String attribute2;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "b")
private List<A> as;
//Getters et Setters
C类：
@Entity
@Table(name = "C")
public class C implements Serializable {
@Id
private String id;
private String attribute1;
private String attribute2;
@OneToMany(fetch = FetchType.LAZY, mappedBy = "c")
private List<B> bs;
//Getters and Setters
并添加了我的存储库和服务，如下所示：
ARepository：
@Repository
public interface ARepository extends JpaRepository<A, String> {
}
AService：
@Service
@Transactional
public class AServiceImpl implements AService {
@Autowired
private ARepository aRepository;
@Override
public List<A> findAll() {
return aRepository.findAll();
}
}
AController：
@RestController
public class AController {
@Autowired
private transient AService aService;
@RequestMapping("/test")
public List<A> test() {
return aService.findAll();
}
SpringBoot的最后一个类是MyApp：
@SpringBootApplication
@EnableTransactionManagement
@EnableJpaRepositories(basePackages = {"fr.dao"})
@EntityScan(basePackages = {"fr.entities"})
@ComponentScan({"fr.dao",
"fr.service",
"fr.web"})
public class App {
public static void main(String[] args) {
SpringApplication.run(App.class, args);
}
}
当我执行http://localhost:8080/test时，我希望获取A的所有记录，如果存在B，我想在C中找到B的列表没有初始化（只是代理）。
此外，我希望项目FetchMode中的Join Select而不是A B。
但我得到的是一个select查询（有Join）和Spring Data试图加载C中的所有B个对象，
这个例外：
Hibernate: select a0_.id as id1_0_, a0_.attribute1 as attribute2_0_, a0_.attribute2 as attribute3_0_, a0_.b_id as b_id4_0_ from a a0_
Hibernate: select b0_.id as id1_1_0_, b0_.attribute1 as attribute2_1_0_, b0_.attribute2 as attribute3_1_0_, b0_.c_id as c_id4_1_0_, c1_.id as id1_2_1_, c1_.attribute1 as attribute2_2_1_, c1_.attribute2 as attribute3_2_1_ from b b0_, c c1_ where b0_.c_id=c1_.id(+) and b0_.id=?
Hibernate: select b0_.id as id1_1_0_, b0_.attribute1 as attribute2_1_0_, b0_.attribute2 as attribute3_1_0_, b0_.c_id as c_id4_1_0_, c1_.id as id1_2_1_, c1_.attribute1 as attribute2_2_1_, c1_.attribute2 as attribute3_2_1_ from b b0_, c c1_ where b0_.c_id=c1_.id(+) and b0_.id=?
Hibernate: select b0_.id as id1_1_0_, b0_.attribute1 as attribute2_1_0_, b0_.attribute2 as attribute3_1_0_, b0_.c_id as c_id4_1_0_, c1_.id as id1_2_1_, c1_.attribute1 as attribute2_2_1_, c1_.attribute2 as attribute3_2_1_ from b b0_, c c1_ where b0_.c_id=c1_.id(+) and b0_.id=?
Hibernate: select bs0_.c_id as c_id4_1_0_, bs0_.id as id1_1_0_, bs0_.id as id1_1_1_, bs0_.attribute1 as attribute2_1_1_, bs0_.attribute2 as attribute3_1_1_, bs0_.c_id as c_id4_1_1_ from b bs0_ where bs0_.c_id=?
2017-05-07 22:13:01.347 ERROR 8476 --- [io-8090-exec-10] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON document: Infinite recursion (StackOverflowError) (through reference chain: fr.entities.B["c"]->fr.entities.C["bs"]->org.hibernate.collection.internal.PersistentBag[0]->....->fr.entities.B["c"])] with root cause
java.lang.StackOverflowError: null
at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_111]
at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_111]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_111]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) ~[na:1.8.0_111]
at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[na:1.8.0_111]
at java.net.URLClassLoader$1.run(URLClassLoader.java:368) ~[na:1.8.0_111]
at java.net.URLClassLoader$1.run(URLClassLoader.java:362) ~[na:1.8.0_111]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_111]
有谁知道如何更改配置以获得我想要的内容？