How to resolve getPrincipal() method error - spring-boot

Question

While accessing the services using JWT token i was trying to print auth.getPrincipal() method it returning packageName.model.CustomUserDetails#3f97b72b instead of the UserDto details.
CustomUserDetails
public class CustomUserDetails implements UserDetails {
private static final long serialVersionUID = 8632209412694363798L;
private UsersDto userDto;
private UserEntity user;
public CustomUserDetails(UsersDto userDto) {
super();
this.userDto = userDto;
}
public UsersDto getUserDto() {
return userDto;
}
public void setUserDto(UsersDto userDto) {
this.userDto = userDto;
}
public CustomUserDetails(UserEntity user) {
this.user = user;
}
#Override
public Collection<? extends GrantedAuthority> getAuthorities() {
// List<GrantedAuthority> authorities = new ArrayList<GrantedAuthority>();
// UserRole role = userDto.getRole();
// authorities.add(new SimpleGrantedAuthority(role.name()));
// return authorities;
return null;
}
#Override
public String getPassword() {
return user.getPassword();
}
#Override
public String getUsername() {
return user.getEmail();
}
#Override
public boolean isAccountNonExpired() {
return true;
}
#Override
public boolean isAccountNonLocked() {
return true;
}
#Override
public boolean isCredentialsNonExpired() {
return true;
}
#Override
public boolean isEnabled() {
return true;
}
}
UsersDto
#Data
#NoArgsConstructor
#AllArgsConstructor
public class UsersDto extends User {
private Integer userId;
public UserEntity convertToUserEntity() throws NoSuchAlgorithmException {
UserEntity user=new UserEntity();
user.setUserId(this.userId);
user.setName(this.getName());
user.setEmail(this.getEmail());
user.setDateAdded(this.getDateAdded());
user.setDateModified(this.getDateModified());
user.setPassword(this.getPassword());
user.setPassword(this.getPassword());
return user;
}
}
UserController
#GetMapping("/getUser/{userId}")
public ResponseEntity<SuccessResponse> getuser(#PathVariable Integer userId,Authentication auth) throws Exception{
System.out.println(auth);
System.out.println(auth.getPrincipal());
UsersDto userFromAuth = ((CustomUserDetails) auth.getPrincipal()).getUserDto();
return ResponseEntity
.ok(new SuccessResponse(HttpStatus.OK.value(), SuccessMessage.SUCCESS,
userService.getUserById(userId)));
}
error
**packagename.CustomUserDetails#3f97b72b**
Instead of class details I want userdetails but it returning className with uniformed number so when i store this data into a variable it always stores NULL values.