Spring Boot 应用程序中的错误无法从一种类型转换为另一种类型

Question

目前我正在创建一个 Spring Boot 应用程序并收到此错误

There was an unexpected error (type=Internal Server Error, status=500).Failed to convert from type [java.util.ArrayList<?>] to type [@org.springframework.data.jpa.repository.Query java.util.List<com.example.vismameetingappwithdb.entity.Meeting>] for value '[Jono Java Meetingas]'; nested exception is org.springframework.core.convert.ConverterNotFoundException: No converter found capable of converting from type [java.lang.String] to type [@org.springframework.data.jpa.repository.Query com.example.vismameetingappwithdb.entity.Meeting]

我的存储库界面如下所示：

@ Repository
public interface MeetingRepository extends JpaRepository<Meeting,Integer>{

@ Query("SELECT nameOfMeeting FROM Meeting WHERE responsiblePerson =?1 ")
List<Meeting> findAllByResponsiblePerson(String responsiblePerson);
}

我的 RestController 类如下所示：

@ RestController
public class MeetingController {

private MeetingService meetingService;

@ Autowired
public MeetingController(MeetingService meetingService){
this.meetingService = meetingService;
}

@ GetMapping("/getmeetings")
public List<Meeting> findAll (){
return meetingService.findAll();
}

@ GetMapping("/responsibleperson/{responsiblePerson}")
public List<Meeting> findAllByResponsiblePerson(@PathVariable String responsiblePerson) {
return meetingService.findAllByResponsiblePerson(responsiblePerson);
}
}

以前有人遇到过这样的问题吗？有人可以帮忙吗？我正在尝试使用负责人端点。

Answer 1

重点看你的代码

@ Query("SELECT nameOfMeeting FROM Meeting WHERE responsiblePerson =?1 ")
List<Meeting> findAllByResponsiblePerson(String responsiblePerson);
}

• SQL查询获取nameOfMeeting的列表，它是List。
• 方法返回Meeting列表，即List。

因此，不匹配会导致错误。