Question

我正在尝试从https://docs.spring.io/spring-data/jpa/docs/current/reference/html/#core.web.basic（基本网络支持）

重现代码示例

我在Spring Web MVC应用程序中有一些控制器：

@Controller    // This means that this class is a Controller
@RequestMapping(path = "/demo") // This means URL's start with /demo (after Application path)
@EnableSpringDataWebSupport
public class MainController {

    @GetMapping(path = "/getResById/{id}")
    @ResponseBody
    public Tresource getResById(@PathVariable("id") Tresource tr, Model m) {
        m.addAttribute(tr);
        return tr;
    }
}

应用程序主条目是具有@SpringBootApplication注释的类。

我也有存储库类：

@Transactional(isolation = Isolation.READ_UNCOMMITTED)
public interface UserRepository extends Repository<Tresource, Long> {

//    List<Tresource> findByBrief(String brief);
    @Query("Select t.brief from Tresource t where t.resourceId=:resourceId")
    String qqq(@Param("resourceId") Long resourceId);

    Optional<Tresource> findDistinctByResourceIdOrBrief(Long resourceId, String brief);

    @Query("Select i from Tresource t "
            + "inner join Tinstitution i on i.institutionId=t.instOwnerId "
            + "where t.resourceId=:resourceId")
    Optional<Tinstitution> getResOwner(@Param("resourceId") Long resourceId);

}

此代码获取异常

2018-03-21 14:33:15.977  WARN 11464 --- [nio-8080-exec-1] .w.s.m.s.DefaultHandlerExceptionResolver : Failed to bind request element: org.springframework.web.method.annotation.MethodArgumentTypeMismatchException: Failed to convert value of type 'java.lang.String' to required type 'com.mycompany.eurofatcafns.db.Tresource'; nested exception is org.springframework.core.convert.ConversionFailedException: Failed to convert from type [java.lang.String] to type [@org.springframework.web.bind.annotation.PathVariable com.mycompany.eurofatcafns.db.Tresource] for value '2010015161038'; nested exception is java.lang.IllegalStateException: Repository doesn't have a find-one-method declared!

当我访问/ demo / getResById / 2010015161038时。这段代码我做错了什么？如何修复此代码？

非常感谢！

Answer 1

找到解决方案！

在我的代码示例中，我使用了

public interface UserRepository extends Repository<Tresource, Long> {

但getOne(ID)和findOne(ID)位于CrudRepository类。

所以，我将代码修改为此代码，现在一切正常：

public interface UserRepository extends CrudRepository<Tresource, Long> {

存储库没有声明find-one-method

1 个答案: