Question

我正在尝试使用我的rest控制器创建一个补丁。我不断出错。我希望补丁能够成功运行。

我尝试了使用json-patch的各种方法。

@PatchMapping(value="/bmwsales/updatescanner/{id}", 
consumes="application/json-patch+json")
public ResponseEntity<Void> 
updateVehicleTagAndroid(@PathVariable(value="id") Integer id,@RequestBody 
JsonPatch patchDoc) {
Bmwsales 
vehicle=bmwService.getVin(id).orElseThrow(ResourceNotFoundException::new);
    BmwsalesUpdate bmwUpdate=mapper.INSTANCE.asInput(vehicle);

    Bmwsales bmwUpdatePatched=patchHelp.patch(patchDoc, vehicle, 
Bmwsales.class);
return ResponseEntity.noContent().build();

PatchHelp

@Component
public class PatchHelp {

private ObjectMapper oMapper;
public PatchHelp(ObjectMapper opMapper){
    this.oMapper=oMapper;
}

public <T> T patch(JsonPatch patch, T targetBean, Class<T> beanClass){

    JsonStructure target=oMapper.convertValue(targetBean, JsonStructure.class);
    JsonValue patched=patch.apply(target);
    return oMapper.convertValue(patched, beanClass);

   }

错误消息是： java.lang.NullPointerException：空在com.principleauto.rfid.util.PatchHelp.patch（PatchHelp.java:37）

com.principleauto.rfid.controller.BmwsalesController.updateVehicleTagAndroid（BmwsalesController.java:221）在sun.reflect.NativeMethodAccessorImpl.invoke0（本机方法）处在sun.reflect.NativeMethodAccessorImpl.invoke（NativeMethodAccessorImpl.java:62）在sun.reflect.DelegatingMethodAccessorImpl.invoke（DelegatingMethodAccessorImpl.java:43）在java.lang.reflect.Method.invoke（Method.java:498）

我不知道我在想什么........

为什么在尝试使用Json-Patch时出现此错误？

0 个答案: