source: trip-planner/src/main/java/finki/diplomska/tripplanner/models/User.java

package finki.diplomska.tripplanner.models;

import com.fasterxml.jackson.annotation.JsonIgnore;
import com.fasterxml.jackson.annotation.JsonManagedReference;
import lombok.AllArgsConstructor;
import lombok.Getter;
import lombok.Setter;
import org.springframework.security.core.GrantedAuthority;
import org.springframework.security.core.userdetails.UserDetails;

import javax.persistence.*;
import javax.validation.constraints.Email;
import javax.validation.constraints.NotBlank;
import java.util.ArrayList;
import java.util.Collection;
import java.util.Date;
import java.util.List;

@Entity
@Table(name = "users")
@AllArgsConstructor
@Getter
@Setter
public class User implements UserDetails {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    @Email(message = "Username needs to be an email")
    @NotBlank(message = "username is required")
    @Column(unique = true)
    private String username;
    @NotBlank(message = "Please enter your full name")
    private String fullName;
    @NotBlank(message = "Password field is required")
    private String password;
    @Transient
    private String confirmPassword;
    private Date create_At;
    private Date update_At;

    //OneToMany with Planners
    @OneToMany(cascade = CascadeType.REFRESH, fetch = FetchType.EAGER, mappedBy = "user", orphanRemoval = true)
    @JsonIgnore
    private List<Planner> planners = new ArrayList<>();

    @OneToMany(cascade = CascadeType.REFRESH, mappedBy = "user", orphanRemoval = true)
    @JsonIgnore
    private List<Location> locationList = new ArrayList<>();;

    public User() {
    }

    public User(String username, String fullName, String password, String confirmPassword) {
        this.username = username;
        this.fullName = fullName;
        this.password = password;
        this.confirmPassword = confirmPassword;
    }

    @PrePersist
    protected void onCreate(){
        this.create_At = new Date();
    }
    @PreUpdate
    protected void onUpdate(){
        this.update_At = new Date();
    }

    @Override
    @JsonIgnore
    public Collection<? extends GrantedAuthority> getAuthorities() {
        return null;
    }

    @Override
    @JsonIgnore
    public boolean isAccountNonExpired() {
        return true;
    }

    @Override
    @JsonIgnore
    public boolean isAccountNonLocked() {
        return true;
    }

    @Override
    @JsonIgnore
    public boolean isCredentialsNonExpired() {
        return true;
    }

    @Override
    @JsonIgnore
    public boolean isEnabled() {
        return true;
    }
}