放入托盘实际没放入 报错

src/main/java/com/iflytop/sgs/app/service/api/TrayService.java

@@ -6,6 +6,8 @@ import com.iflytop.sgs.app.model.vo.SetTrayTubeVO;
 import com.iflytop.sgs.app.service.device.DeviceSensorService;
 import com.iflytop.sgs.app.service.device.DeviceStateService;
 import com.iflytop.sgs.common.enums.DeviceSensorCode;
+import com.iflytop.sgs.common.exception.AppException;
+import com.iflytop.sgs.common.result.ResultCode;
 import com.iflytop.sgs.hardware.exception.HardwareException;
 import lombok.RequiredArgsConstructor;
 import org.springframework.beans.factory.ObjectProvider;
@@ -43,8 +45,9 @@ public class TrayService {
             deviceStateService.getDeviceState().getTrays().add(trayState);
             deviceStateService.getDeviceState().getSolutionModule().setFeedAreaTrayStatus(true);
             return trayState;
+        } else {
+            throw new AppException(ResultCode.FEED_AREA_EXIST_TRAY);
         }
-        return null;
     }
 
     /**