我目前正在做一个小的个人项目（springboot + MYSQL），在POSTMAN中测试时，它显示404资源没有找到。
注意：应用程序和MYSQL都成功运行，没有任何问题，POSTMAN工作正常。
据我所知，控制器很好。
代码中的问题在哪里？请帮助我。

主类

@SpringBootApplication   

public class CafeManagementSystemApplication {

    public static void main(String[] args) {
        SpringApplication.run(CafeManagementSystemApplication.class, args);
    }

}

控制器

接口：

@RequestMapping(path = "/user")
public interface UserRest {
    
    @PostMapping(path = "/signup")
    public ResponseEntity<String> signup(@RequestBody(required = true) Map<String,String> requestMap);

    
}

类别：

@RestController
@RequestMapping(path = "/user")
public class UserRestImpl implements UserRest {
    
    @Autowired
    UserService userService;

    
    @PostMapping(path = "/signup")
    public ResponseEntity<String> signup(Map<String, String> requestMap) {
        // TODO Auto-generated method stub
        try {
            return userService.signUp(requestMap);
            
        } catch (Exception e) {
            e.printStackTrace();
        }
        return CafeUtils.getResponseEntity(CafeConstants.SOMETHING_WENT_WRONG,   HttpStatus.INTERNAL_SERVER_ERROR);
    }

}

服务

@Service
@Slf4j
public class UserServiceImpl  implements UserService{

   @Autowired
    UserDao userDao;       // repository
   
   @Override
   public ResponseEntity<String> signUp(Map<String, String> requestMap) {
       
       try {
       
                   log.info("{Inside signUp {}",requestMap);
                   
                   if(validateSignupMap(requestMap)) {    // method present in same class
                        
                       User user=userDao.findByEmailId(requestMap.get("email"));
                       
                       if(Objects.isNull(user)) {
                           userDao.save(getUserFromMap(requestMap));                 
                           return CafeUtils.getResponseEntity("Successfully registered ", HttpStatus.OK);
                       }
                       else {
                           return CafeUtils.getResponseEntity("email already present",HttpStatus.BAD_REQUEST);
                       }
                       
                   }
                   else {
                       return CafeUtils.getResponseEntity(CafeConstants.INVALID_DATA, HttpStatus.BAD_REQUEST);
                       
                   }
       }
       catch(Exception e) {
           e.printStackTrace();
       }
       
       return CafeUtils.getResponseEntity(CafeConstants.SOMETHING_WENT_WRONG, HttpStatus.INTERNAL_SERVER_ERROR);
       
   }
   
   private Boolean validateSignupMap(Map<String,String> requestMap) {
       
       if(requestMap.containsKey("name") && requestMap.containsKey("contactNumber") && requestMap.containsKey("email") && requestMap.containsKey("password"))
           {
               return true;
           }
           return false;
    }
   
   private User getUserFromMap(Map<String,String> map) {          // MAP to USER object
       
       User u= new User();
       u.setName(map.get("name"));
       u.setContactNumber(map.get("contactNumber"));
       u.setEmail(map.get("email"));
       u.setPassword(map.get("password"));
       u.setStatus("false");
       u.setRole("user");
       
       return u;
       
   }
   
   
   

}

POJO

@NamedQuery(name="User.findByEmailId", query = "select u from User u where u.email=:email")   
                                                                                        

@Entity
@Table(name="user")
@DynamicInsert
@DynamicUpdate
@Data
public class User  implements Serializable{
    
    private static final long serialVersionUID=1L;
    
    
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private int id;
    
    @Column(name = "name")
    private String name;
    
    @Column(name = "conatactNumber")
    private String contactNumber;
    
    @Column(name = "email")
    private String email;
    
    @Column(name = "password")
    private String password;
    
    @Column(name = "status")
    private String status;
    
    @Column(name = "role")
    private String role;
    
    
    
    

}

REPO

public interface UserDao extends JpaRepository<User, Integer> {

    
    User findByEmailId(@Param("email") String email);       
}

应用程序.属性

spring.datasource.driver-class-name=com.mysql.cj.jdbc.Driver

spring.datasource.url=jdbc:mysql://localhost:3306/cafe?allowPublicKeyRetrieval=true&useSSL=false
spring.datasource.username=root
spring.datasource.password=password_root

spring.jpa.show-sql=true       

spring.jpa.hibernate.ddl-auto=update

spring.jpa.properties.hibernate.dialect=org.hibernate.dialect.MySQL5Dialect

spring.jpa.properties.hibernate.format_sql=true

server.port=8081

POM.XML

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.0.4</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.inn.cafe</groupId>
    <artifactId>com.inn.cafe</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>Cafe Management System</name>
    <description>Cafe Management System Project </description>
    <properties>
        <java.version>17</java.version>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-jdbc</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>com.mysql</groupId>
            <artifactId>mysql-connector-j</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <build>
        
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
                <configuration>
                    <excludes>
                        <exclude>
                            <groupId>org.projectlombok</groupId>
                            <artifactId>lombok</artifactId>
                        </exclude>
                    </excludes>
                </configuration>
            </plugin>
        </plugins>
        
        
    </build>

</project>

我试着在POSTMAN测试，但它显示404错误。
注意： Postman 工作正常，我已经通过测试另一个应用程序检查。
代码中的问题是什么？在应用程序中查找的位置
当我点击http：//localhost：8081/user/signup时，我得到的是404