spring servlet.service()用于servlet [dispatcherServlet]在路径[]的上下文中抛出异常[Request processing failed

我在创建spring maven rest webservice项目时出错。我是新的Spring Boot，谁能帮我这个。错误是：

Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is org.springframework.dao.DataIntegrityViolationException: not-null property references a null or transient value : com.example.spring.backend.model.Employee.firstName; nested exception is org.hibernate.PropertyValueException: not-null property references a null or transient value : com.example.spring.backend.model.Employee.firstName] with root cause

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我使用MySQL Workbench创建了一个数据库，并在其中定义了一个表来存储员工的详细信息。下面是我的代码：

EmployeeController.java

@RestController
@RequestMapping("/api/employees")
public class EmployeeController {
    
    private EmployeeService employeeService;

    public EmployeeController(EmployeeService employeeService) {
        super();
        this.employeeService = employeeService;
    }
    
    // build create employee REST API
    @PostMapping()
    public ResponseEntity<Employee> saveEmployee(@RequestBody Employee employee){
        return new ResponseEntity<Employee>(employeeService.saveEmployee(employee), HttpStatus.CREATED);
    }
}

型

Employee.java

@Data
@Entity
@Table(name="employees")
public class Employee {
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private long id;
    
    @Column(name = "first_name", nullable = false)
    private String firstName;
    
    @Column(name = "last_name")
    private String lastName;
    
    @Column(name = "email")
    private String email;
}

型

EmployeeRepository.java

public interface EmployeeRepository extends JpaRepository<Employee, Long>{
    
}

型

EmployeeService.java

public interface EmployeeService {
    Employee saveEmployee(Employee employee);
}

型

EmployeeServiceImpl.java

@Service
public class EmployeeServiceImpl implements EmployeeService{

    private EmployeeRepository employeeRepository;
    
    public EmployeeServiceImpl(EmployeeRepository employeeRepository) {
        super();
        this.employeeRepository = employeeRepository;
    }

    @Override
    public Employee saveEmployee(Employee employee) {
        return employeeRepository.save(employee);
    }

}

型

应用.属性

spring.datasource.url=jdbc:mysql://localhost:3306/employee_management_system?useSSL=false
spring.datasource.username=root
spring.datasource.password=root

# Hibernate properties
spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5InnoDBDialect
# create, create-drop
spring.jpa.hibernate.ddl-auto=update

型
使用 Postman 发送邮件请求时，我收到了内部服务器错误500。

**Input**
{
    "firstName": "abc",
    "lastName": "abc",
    "email": "abc@gmail.com"
}

**Result:**
{
    "timestamp": "2022-10-26T09:48:51.322+00:00",
    "status": 500,
    "error": "Internal Server Error",
    "path": "/api/employees"
}

型
我从youtube视频中引用，但在视频中，代码的工作，但不是在我的情况下。

请告诉我代码中有什么错误。提前感谢

有时注解或数据Map有问题，一旦尝试使用此代码

控制器--

@RestController
@RequestMapping("/api/user")
public class UserController {
/** The user service. */
@Autowired
private UserService userService;

// get all users
@GetMapping("/")
public List<UserEntity> getAllUsers() {
    return userService.getAllUsers();
}

// create user rest API
@PostMapping("/")
public ResponseEntity<UserEntity> createUser(@RequestBody UserEntity user) {
    UserEntity createUser = userService.createUser(user);
    return ResponseEntity.ok(createUser);
}

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}
-UserEntity --（执行getter setter）

@Entity
public class UserEntity {

/** The id. */
@Id
private Integer id;

/** The first name. */
private String firstName;

/** The last name. */
private String lastName;

/** The email id. */
private String emailId;
}

型

售后服务-

@Service
public class UserService {

/** The user dao. */
@Autowired
private UserDao userDao;

public List<UserEntity> getAllUsers() {
    List<UserEntity> allUsers = userDao.findAll();
    return allUsers;
}

/**
 * Creates the user.
 */
public UserEntity createUser(UserEntity user) {
    return userDao.save(user);
}
}

型
-DAO--

@Repository
 public interface UserDao extends JpaRepository<UserEntity, Integer> {
}

型
-------application.properties----------

server.port=8080
spring.jpa.show-sql=true
spring.datasource.url=jdbc:mysql://localhost:3306/test
spring.datasource.username=**
spring.datasource.password=**
spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

型

spring servlet.service()用于servlet [dispatcherServlet]在路径[]的上下文中抛出异常[Request processing failed

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