Java Spring Rest API 404 message

I'm making a RestApi in Java Spring(Gradle). When compile the code, and try it in Postman it returns with 404. I don't know why, and it is very annoying.

package arma.Arma.RestController;import arma.Arma.Service.UserService;import arma.Arma.doman.User;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.http.MediaType;import org.springframework.web.bind.annotation.*;import java.util.List;@RestController@RequestMapping(value = "api/user")public class UserRestController {    @Autowired    UserService userService;    @RequestMapping(value = "/all", method = RequestMethod.GET, produces = MediaType.APPLICATION_JSON_VALUE)    public List<User> getAll() {        return userService.getAll();    }}

UserService

package arma.Arma.Service;import arma.Arma.Repository.UserRepository;import arma.Arma.doman.User;import org.springframework.beans.factory.annotation.Autowired;import org.springframework.stereotype.Service;import java.util.List;@Servicepublic class UserService {    @Autowired    UserRepository userRepository;    public List<User> getAll() {        return userRepository.findAll();    }}

User

package arma.Arma.doman;import javax.persistence.*;@Entity@Table(name = "users")public class User {    @Id    @GeneratedValue(strategy = GenerationType.IDENTITY)    @Column(name = "user_id", nullable = false)    private Long id;    @Column(name = "username", nullable = false)    private String username;    @Column(name = "email", nullable = false)    private String email;    @Column(name = "password", nullable = false)    private String password;    @Column(name = "user_type", nullable = false)    private UserType type;    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 getEmail() {        return email;    }    public void setEmail(String email) {        this.email = email;    }    public String getPassword() {        return password;    }    public void setPassword(String password) {        this.password = password;    }}

I read tonns of solutions, and none of them helped. Also, it is the first time it appeared, I configured Tomcat, Java, MySql, etc in many machines, and now I'm really helpless.