@Entity
@Table(name = "person", uniqueConstraints=@UniqueConstraint(columnNames= {"userName"}))
public class PersonForm {

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

@NotNull(message = "Username is required")
@Size(min=5, message="Username length is no less than 5 characters")
@Pattern(message="Username accepts alpha-numeric values only" , regexp="^[a-zA-z0-9]*$")
private String userName;

@NotNull(message = "Password is required")
@Size(min=8, message="The password length is no less than 8 characters")
@Pattern(message="Password should contains at least 1 number, 1 uppercase, and 1 lowercase character ", regexp="^(?=.*[a-z])(?=.*[A-Z])(?=.*\\d)[a-zA-Z\\d]{8,}$")
private String password;

public Long getId() {
	return id;
}

public void setId(Long id) {
	this.id = id;
}

public String getUserName() {
	return userName;
}

public void setUserName(String userName) {
	this.userName = userName;
}

public String getPassword() {
	return password;
}

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

@Override
public String toString() {
	return "Username is " + this.userName + " and password is " + this.password;
}

}

@Controller
public class PersonRegistration implements WebMvcConfigurer {

@Autowired
private PersonService personService;

private static final String USER_REGISTRATION_FORM = "personForm";

@Override
public void addViewControllers(ViewControllerRegistry registry) {
    registry.addViewController("/results").setViewName("results");
}

@GetMapping("/")
public String showForm(PersonForm personForm) {
	return USER_REGISTRATION_FORM;
}

@PostMapping("/")
public String checkPersonInfo(@Valid PersonForm personForm, BindingResult bindingResult) {
	System.out.println(personForm.toString());
	if (bindingResult.hasErrors()) {
		return USER_REGISTRATION_FORM;
	}
	//Save the Username and Password in HSQLDB
	personService.add(personForm);
	
	return "redirect:/results";
}

}

@Autowired
private PersonRepository personRepository;

public PersonServiceImpl() {
}

@Override
public void add(PersonForm person) {
	personRepository.save(person);
}