Why I've got a multiply data from findById() method Spring Data? - spring

Question

Hi everyone I recently work with Spring Data and I have such a question.
I have my Entity that mapped like this:
#Getter
#Setter
#EqualsAndHashCode(callSuper = true)
#ToString(callSuper = true)
#Table(name = "movie")
#Entity
public class Movie extends BaseEntity {
private String name;
#Enumerated(EnumType.STRING)
#Column(columnDefinition = "enum('ACTION','DRAMA','COMEDY','FANTASY','HORROR')")
private Genre genre;
private BigDecimal budget;
#ManyToMany(mappedBy = "movies")
private Set<Actor> actors;
public Movie() {
}
}
My Actor Entity:
#Getter
#Setter
#EqualsAndHashCode(callSuper = true, exclude = "movies")
#ToString(callSuper = true, exclude = "movies")
#Table(name = "actor")
#Entity
public class Actor extends BaseEntity {
#Column(name = "first_name")
private String firstName;
#Column(name = "last_name")
private String lastName;
#Column(name = "salary")
private BigDecimal salary;
#ManyToMany(cascade = CascadeType.ALL)
#JoinTable(
name = "actor_movie",
joinColumns = {#JoinColumn(name = "actor_id")},
inverseJoinColumns = {#JoinColumn(name = "movie_id")}
)
private Set<Movie> movies;
public Actor() {
}
}
And my BaseEntity;
#Data
#MappedSuperclass
public class BaseEntity implements Serializable {
#Id
#GeneratedValue(strategy = GenerationType.IDENTITY)
private Long id;
}
I am using JpaRepository<Actor, Long> to get my actors from database:
#Repository
public interface ActorRepository extends JpaRepository<Actor, Long> {
}
And here is my controller:
#RestController
#RequestMapping("actor")
public class ActorController {
#Autowired
ActorRepository actorRepository;
#PostMapping
public Actor save(#RequestBody Actor actor) {
actorRepository.save(actor);
return actor;
}
#GetMapping
public Iterable<Actor> findAllActors() {
return actorRepository.findAll();
}
#GetMapping("{id}")
public Actor findActor(#PathVariable Long id) {
return actorRepository.findById(id).orElseThrow(NotFoundException::new);
}
#PutMapping("{id}")
public Actor update(#RequestBody Actor actor, #PathVariable Long id) {
actor.setId(id);
return actorRepository.save(actor);
}
#DeleteMapping("{id}")
public ResponseEntity<Actor> delete(#PathVariable Long id) {
actorRepository.deleteById(id);
return new ResponseEntity<>(HttpStatus.NO_CONTENT);
}
}
So when I'm trying to get my actor by id it gets a so many times:
And finally it fails with StackOverFlowError:
java.lang.StackOverflowError: null
at java.lang.ClassLoader.defineClass1(Native Method) ~[na:1.8.0_172]
at java.lang.ClassLoader.defineClass(ClassLoader.java:763) ~[na:1.8.0_172]
at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) ~[na:1.8.0_172]
at java.net.URLClassLoader.defineClass(URLClassLoader.java:467) ~[na:1.8.0_172]
at java.net.URLClassLoader.access$100(URLClassLoader.java:73) ~[na:1.8.0_172]
at java.net.URLClassLoader$1.run(URLClassLoader.java:368) ~[na:1.8.0_172]
at java.net.URLClassLoader$1.run(URLClassLoader.java:362) ~[na:1.8.0_172]
at java.security.AccessController.doPrivileged(Native Method) ~[na:1.8.0_172]
at java.net.URLClassLoader.findClass(URLClassLoader.java:361) ~[na:1.8.0_172]
at java.lang.ClassLoader.loadClass(ClassLoader.java:424) ~[na:1.8.0_172]
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:349) ~[na:1.8.0_172]
at java.lang.ClassLoader.loadClass(ClassLoader.java:357) ~[na:1.8.0_172]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:737) ~[jackson-databind-2.9.9.jar:2.9.9]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.9.jar:2.9.9]
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serializeContents(CollectionSerializer.java:145) ~[jackson-databind-2.9.9.jar:2.9.9]
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:107) ~[jackson-databind-2.9.9.jar:2.9.9]
at com.fasterxml.jackson.databind.ser.std.CollectionSerializer.serialize(CollectionSerializer.java:25) ~[jackson-databind-2.9.9.jar:2.9.9]
at com.fasterxml.jackson.databind.ser.BeanPropertyWriter.serializeAsField(BeanPropertyWriter.java:727) ~[jackson-databind-2.9.9.jar:2.9.9]
at com.fasterxml.jackson.databind.ser.std.BeanSerializerBase.serializeFields(BeanSerializerBase.java:719) ~[jackson-databind-2.9.9.jar:2.9.9]
at com.fasterxml.jackson.databind.ser.BeanSerializer.serialize(BeanSerializer.java:155) ~[jackson-databind-2.9.9.jar:2.9.9]
Why is this happens? And how it can be fixed?