Why, when the admin wants to add a new admin, I get an error in the tomato. I kind of wrote the code correctly, you can see probably made a mistake. I want the admin to be able to add a new user and give him a username, password, role (admin or user). And also that he stored information in a database MySQL. Problem on page "AddUser.JSP"
Tomcat Error 
AdminController
@Controller
@RequestMapping("/admin")
public class AdminController {
@Autowired
private StudentService studentService;
private UserService userService;
@GetMapping("/allStudentsAdmin")
public ModelAndView allStudentsForUser() {
ModelAndView mv = new ModelAndView();
List<Student> studentList = studentService.getAllStudents();
mv.addObject("studentList", studentList);
mv.setViewName("allStudentsAdmin");
return mv;
}
@GetMapping(value = "/deleteStudent/{id}")
public ModelAndView deleteUserById(@PathVariable Long id) {
studentService.deleteStudentById(id);
ModelAndView mv = new ModelAndView("redirect:/admin/allStudentsAdmin");
return mv;
}
@GetMapping(value = "/editStudent/{id}")
public ModelAndView displayEditUserForm(@PathVariable Long id) {
ModelAndView mv = new ModelAndView("adminEditStudent");
Student student = studentService.getStudentById(id);
mv.addObject("headerMessage", "Редактирование студента");
mv.addObject("student", student);
return mv;
}
@PostMapping(value = "/editStudent")
public String saveEditedUser(
@RequestParam("id") Long id,
@RequestParam("name") String name,
@RequestParam("surname") String surname,
@RequestParam("avatar") MultipartFile file) {
try {
studentService.updateStudent(name, surname, file, studentService.getStudentById(id));
} catch (FileSystemException ex) {
ex.printStackTrace();
} catch (IOException e) {
return "redirect:/errors";
}
return "redirect:/admin/allStudentsAdmin";
}
@GetMapping(value = "/addStudentAdmin")
public ModelAndView displayNewUserForm() {
ModelAndView mv = new ModelAndView("addStudentAdmin");
mv.addObject("headerMessage", "Add Student Details");
mv.addObject("student", new Student());
return mv;
}
@PostMapping(value = "/addStudentAdmin")
public String saveNewStudent(@RequestParam("name") @NonNull String name,
@RequestParam("surname") @NonNull String surname,
@RequestParam("avatar") MultipartFile file)
throws IOException {
Student student = new Student();
student.setSurname(surname);
student.setName(name);
if (file != null && !file.isEmpty()) {
student.setAvatar(studentService.saveAvatarImage(file).getName());
}
studentService.saveStudent(student);
return "redirect:/admin/allStudentsAdmin";
}
@GetMapping(value = "/addUser")
public ModelAndView displayAddUserForm() {
ModelAndView mv = new ModelAndView("addUser");
mv.addObject("user", new User());
return mv;
}
@PostMapping(value = "/addUser")
public String saveNewUser(@RequestParam("login") @NonNull String login,
@RequestParam("password") @NonNull String password,
@RequestParam("role") @NonNull String role)
throws IOException {
User user = new User();
user.setPassword(password);
user.setLogin(login);
userService.saveUser(user);
return "redirect:/admin/allStudentsAdmin";
}
}
AddUser.JSP
<body>
<div class="add">
<br>
<br>
<br>
<br>
<center>
<form:form method="POST" action="${pageContext.request.contextPath}/admin/addUser" enctype="multipart/form-data">
<table>
<tr>
<td><label path="Login">Login</label></td>
<td><input type="text" name="login"/></td>
</tr>
<tr>
<td><label path="Password">Password</label></td>
<td><input type="text" name="password"/></td>
</tr>
<tr>
<td><select path="role" name="nubexSelect" size="3" multiple form="nubexForm">
<option>Admin</option>
<option>User</option>
</select></td>
<td><input class="btn btn-primary" type="submit" value="Submit"></td>
</tr>
</table>
</form:form>
</center>
</div>
</body>
User.JAVA
@Entity
@Table(name = "user")
public class User implements Serializable {
@Id
@GeneratedValue(strategy = GenerationType.AUTO)
private long id;
private String login;
private String password;
private String role;
public long getId() {
return id;
}
public void setId(long id) {
this.id = id;
}
public String getLogin() {
return login;
}
public void setLogin(String login) {
this.login = login;
}
public String getPassword() {
return password;
}
public void setPassword(String password) {
this.password = password;
}
public String getRole() {
return role;
}
public void setRole(String role) {
this.role = role;
}
@Override
public String toString() {
return "Student{" +
"id=" + id +
", login='" + login + '\'' +
", password='" + password + '\'' +
", role='" + role + '\'' +
'}';
}
}
UserRepository.JAVA
@Repository
public interface UserRepository extends CrudRepository<User, Long>{
}
UserService.JAVA
public interface UserService {
boolean saveUser(User user);
User updateUser(String login, String password, String role, User targetUser) throws IOException;
}
UserServiceImpl.java
@Service
@Transactional
public class UserServiceImpl implements UserService {
@Value("${storage.location}")
private String storageLocation;
private UserRepository repository;
public UserServiceImpl() {
}
@Autowired
public UserServiceImpl(UserRepository repository) {
super();
this.repository = repository;
}
@Override
public boolean saveUser(User user) {
try {
repository.save(user);
return true;
} catch (Exception ex) {
return false;
}
}
@Override
public User updateUser(String login, String password, String role, User targetUser)
throws IOException {
if (login != null && !login.equals(targetUser.getLogin())) {
targetUser.setLogin(login);
}
if (password != null && !password.equals(targetUser.getPassword())) {
targetUser.setPassword(password);
}
if (role != null && !role.equals(targetUser.getRole())) {
targetUser.setRole(role);
}
return targetUser;
}
SecurityConfig
@Configuration
@EnableWebSecurity
public class SecurityConfig extends WebSecurityConfigurerAdapter {
@Override
protected void configure(final AuthenticationManagerBuilder auth) throws Exception {
auth.inMemoryAuthentication()
.withUser("admin").password(passwordEncoder().encode("1234")).roles("ADMIN")
.and()
.withUser("user").password(passwordEncoder().encode("user1234")).roles("USER")
.and();
}
@Override
protected void configure(HttpSecurity http) throws Exception {
http.authorizeRequests()
.antMatchers("/admin/**").hasRole("ADMIN")
.antMatchers("/user/**").hasRole("USER")
.antMatchers("/**").permitAll()
.and()
.formLogin()
.loginPage("/login")
.defaultSuccessUrl("/allStudents")
.and()
.logout()
.and()
.csrf().disable();
}
@Bean
public PasswordEncoder passwordEncoder() {
return new BCryptPasswordEncoder();
}
}
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