java在调用Spring引导API时遇到404错误

Question

我编写了一些请求映射，并使用JPA将我的Spring Boot应用程序连接到Postgresql数据库。但是，当我尝试调用API时，会收到以下消息： {"timestamp":"2021-01-30T21:58:34.028+00:00","status":404,"error":"Not Found","message":"","path":"/api/v1/sessions"}。我试着在调用API时打印一条消息，它可以工作，所以我认为它可能与JPA连接有关？（我还使用SQL Shell测试了数据库和凭据是否良好，它们是否正常）

我的模型：

@Entity(name = "sessions")
public class Session {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long session_id;

    private String session_name;
    private String session_description;
    private Integer session_length;

    @ManyToMany
    @JoinTable(
            name = "session_speakers",
            joinColumns = @JoinColumn(name = "session_id"),
            inverseJoinColumns = @JoinColumn(name = "speaker_id"))
    private List<Speaker> speakers;

我的控制器：

@Controller
@RequestMapping("/api/v1/sessions")
public class SessionsController {

    @Autowired
    private SessionRepository sessionRepository;

    @GetMapping
    public List<Session> list() {
        System.out.println("Get method called");
        return sessionRepository.findAll();
    }

    @GetMapping
    @RequestMapping("{id}")
    public Session get(@PathVariable Long id) {
        return sessionRepository.getOne(id);
    }

我的存储库：

public interface SessionRepository extends JpaRepository<Session, Long> {
}

最后，我的应用程序属性：

spring.datasource.url=jdbc:postgresql://localhost:5432/databaseName
spring.datasource.username=postgres
spring.datasource.password=mypasswordhere
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.hibernate.ddl-auto=update
spring.jpa.hibernate.show-sql=true

Answer 1

    @GetMapping(value = "/{id}")< -remove Request mapping and also add the slash here
    public Session get(@PathVariable Long id) {
        return sessionRepository.getOne(id);
    }