**This is my entitity class **

@Entity
@Data
public class User implements UserDetails {

    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;
    private String name;
    @Column(unique = true)
    private String email;
    private String password;
    @Column(unique = true)
    private String phoneNumber;
    @Column(unique = true)
    private String idNumber;
    private UserRole userRole;
}

This is my requestDto class

@Data
public class SignupRequest {

    private String name;
    private String email;
    private String password;
    private String phoneNumber;
    private String idNumber;
}

Mapping logic

@Override
    public ResponseEntity<StandardResponse> createUserAccount(SignupRequest signupRequest) {
        try {
            if (!userRepository.existsByEmail(signupRequest.getEmail())){
                System.out.println(signupRequest);
                User user = modelMapper.map(signupRequest,User.class);
                user.setPassword(new BCryptPasswordEncoder().encode(signupRequest.getPassword()));
                user.setUserRole(UserRole.EMPLOYEE);
                userRepository.save(user);
                return new ResponseEntity<StandardResponse>(new StandardResponse(201,"User account added"), HttpStatus.CREATED);
            }else {
                return new ResponseEntity<StandardResponse>(new StandardResponse(400,"This user account already added"), HttpStatus.BAD_REQUEST);
            }
        }catch (Exception e){
            return new ResponseEntity<StandardResponse>(new StandardResponse(400,"Error occurred while adding new user"+e.getMessage()), HttpStatus.BAD_REQUEST);
        }

    }

If i enter some string with number like “455gb” in idNumber then below error is shown but if i enter only number it works normally.

error output

“Error occurred while adding new userModelMapper mapping errors:nn1) Converter org.modelmapper.internal.converter.NumberConverter@d35d185 failed to convert java.lang.String to java.lang.Long.nn1 error”

How to fix this error and what are the bug in my code