Styjun

I am developing an REST API application using spring boot and is struck up with the One to Many mapping while using mappedBy property.
I have User class and Usermeata class, a user can have more than one usermeta.

While the program successfully save the foreign while using JoinColumn, I want to know what mistake I am committing while using mappedby.

Here is my code:

User Entity class:

@Entity
@Table(name="User")
public class User 
 @Id
 @GeneratedValue(strategy=GenerationType.AUTO)
 private Long userId;

 @Column(unique=true)
 private String username;

 @Column(unique=true)
 private String emailId; 

 private String password;
 private String firstName;
 private String lastName;
 private String phoneNo;
 @OneToMany(fetch=FetchType.EAGER,cascade=CascadeType.ALL,mappedBy="user")
// @JoinColumn(name="user_id")
 private List<UserMeta> userMetaList=new ArrayList();




 public List<UserMeta> getUserMetaList() 
 return userMetaList;
 

 public void setUserMetaList(List<UserMeta> userMetaList) 
 this.userMetaList = userMetaList;
 

 public Long getUserId() 
 return userId;
 

 public void setUserId(Long userId) 
 this.userId = userId;
 

 public String getUsername() 
 return username;
 

 public void setUsername(String username) 
 this.username = username;
 

 public String getEmailId() 
 return emailId;
 

 public void setEmailId(String emailId) 
 this.emailId = emailId;
 

 public String getPassword() 
 return password;
 

 public void setPassword(String password) 
 this.password = password;
 

 public String getFirstName() 
 return firstName;
 

 public void setFirstName(String firstName) 
 this.firstName = firstName;
 

 public String getLastName() 
 return lastName;
 

 public void setLastName(String lastName) 
 this.lastName = lastName;
 

 public String getPhoneNo() 
 return phoneNo;
 

 public void setPhoneNo(String phoneNo) 
 this.phoneNo = phoneNo;
 

UserMeta class:

@Entity
public class UserMeta 

 @Id
 @GeneratedValue(strategy=GenerationType.AUTO)
 private Long userMetaId;

 @ManyToOne
 @JoinColumn(name="user_id")
 private User user;

 private String _key;

 private String _value;

 public Long getUserMetaId() 
 return userMetaId;
 

 public void setUserMetaId(Long userMetaId) 
 this.userMetaId = userMetaId;
 

 public User getUser() 
 return user;
 

 public void setUser(User user) 
 this.user = user;
 

 public String get_key() 
 return _key;
 

 public void set_key(String _key) 
 this._key = _key;
 

 public String get_value() 
 return _value;
 

 public void set_value(String _value) 
 this._value = _value;
 

UserService.class

@Service
public class UserService 

 @Autowired
 private UserRepository userRepository;

 public User getUser(Long userId) 
 return userRepository.getOne(userId);
 

 public List<User> getAllUser() 
 return userRepository.findAll();
 

 public User addUser(User user) 
 return userRepository.save(user);
 

 public void removeUser(User user) 
 userRepository.delete(user);
 

 public void updateUser(User user) 
 userRepository.save(user);
 

POST request:

 "username":"myusername",
 "emailId":"myemailid@gmail.com1",
 "password":"2323@123",
 "firstName":"myfname",
 "lastName":"mlname",
 "phoneNo":"000000",
 "userMetaList":[
 
 "_key":"api_key",
 "_value":"api_key_value"
 ,
 
 "_key":"prop1",
 "_value":"val1"
 
 ]

Now the tables are created and updated with the values, however the column user_id in the table usermeta is always null..