Null value in primary key of hibernate entity - spring-boot

Question

I faced with problem of null value in PK.
Here's an entity:
#Entity
#Table(name="space")
public class Space implements Serializable {
#Id
#GeneratedValue
#Column(nullable = false, unique = true)
private Long id;
#ManyToOne(fetch = FetchType.LAZY)
#JoinColumn(name="user_id")
private UserAccount user;
private String name;
private String description;
private Date createdTime;
private Date modifiedTime;
#OneToMany(mappedBy="space")
private Set<SpaceAccess> spaceAccesses = new HashSet<>();
public Set<SpaceAccess> getSpaceAccesses() {
return spaceAccesses;
}
public void setSpaceAccesses(Set<SpaceAccess> spaceAccesses) {
this.spaceAccesses = spaceAccesses;
}
public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public Space() {}
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public UserAccount getUser() {
return user;
}
public void setUser(UserAccount user) {
this.user = user;
}
public String getDescription() {
return description;
}
public void setDescription(String description) {
this.description = description;
}
public Date getCreatedTime() {
return createdTime;
}
public void setCreatedTime(Date createdTime) {
this.createdTime = createdTime;
}
public Date getModifiedTime() {
return modifiedTime;
}
public void setModifiedTime(Date modifiedTime) {
this.modifiedTime = modifiedTime;
}
}
I wrote strategy to generate PK properly but I always get Null in id field when I create new instance of the Space:
Space space = new Space();
Here's content of the object:
What i should do to generate id of instance properly using hibernate/spring mechanisms?
application.properties:
spring.datasource.url="some_url"
spring.datasource.username=name
spring.datasource.password=password
spring.jpa.generate-ddl=true
P.S. I use spring-boot-starter-data-jpa with version: 2.3.4.RELEASE.

Answer 1

Use:
public Long getId() {
return id;
}
public void setId(Long id) {
this.id = id;
}