[英]NotReadablePropertyException: Invalid property 'productss' of bean class [java.util.ArrayList]
[英]Invalid property `xyz` of bean class[java.util.ArrayList]: Bean property 'xyz' is not readable or has an invalid getter method
我是Spring Boot的新手。 我在使用基於Javax的驗證時遇到麻煩。 控制器期望從POST端點獲取json obj的列表。 在JSON請求json數組中,如果engine
或name
為null,我將得到正確的400錯誤。 但是,當engine.type
或engine.name
為null時,它將引發500個異常並顯示錯誤消息:
Caused by: org.springframework.beans.NotReadablePropertyException: Invalid property 'engine' of bean class
[java.util.ArrayList]: Bean property 'engine' is not readable or has an invalid
getter method: Does the return type of the getter match the parameter type of
the setter?
Controller.java
@RestController
@Validated
public class CarController {
@PostMapping(path = "/cars")
public ResponseEntity<PostModelResponse> createModel(
@Valid @RequestBody ArrayList<Car> cars)
throws JSONException, ConstraintViolationException {
...
return new ResponseEntity<>(response, HttpStatus.CREATED);
}
}
汽車.java
class Car {
@NotNull
@Valid
private Engine engine;
@NotNull
private String name;
Cars(Engine engine, String name) {
this.engine = engine;
this.name = name;
}
public String getName(){ return name; }
public void setName(String name) { this.name = name;}
public Engine getEngine() { return engine; }
public void setEngine(Engine engine){ this.engine = engine; }
}
Engine.java
class Engine {
@NotNull
private String type;
@NotNull
private String name;
Engine(String type, String name) {
this.type = type;
this.name = name;
}
public String getType() { return type; }
public void setType(String type) { this.type = type; }
public String getName() { return name; }
public void setName(String name) { this.name = name;}
}
CollectionValidator.java
public class CollectionValidator implements Validator {
private final Validator validator;
public CollectionValidator(LocalValidatorFactoryBean validator) {
this.validator = validator;
}
@Override
public boolean supports(Class<?> clazz) {
return Collection.class.isAssignableFrom(clazz);
}
@Override
public void validate(Object target, Errors errors) {
Collection col = (Collection) target;
for ( Object obj : col ) {
ValidationUtils.invokeValidator(validator, obj, errors);
}
}
}
ValidatorAdvice.java
@ControllerAdvice
public class ValidatorAdvice {
@Autowired
protected LocalValidatorFactoryBean validator;
@InitBinder
public void initBinder(WebDataBinder binder) {
binder.initDirectFieldAccess();
binder.addValidators(new CollectionValidator(validator));
}
}
請求/響應:URL: http:// localhost:8080 / cars
POST正文:[{“名稱”:“沃爾沃”,“引擎”:{“類型”:“ v3”,“名稱”:“ volvo_engine”}}]
響應:200(OK)
POST正文:[{“ engine”:{“ type”:“ v3”,“ name”:“ volvo_engine”}}]
響應:400(缺少預期的coz name
)
POST正文:[{“ name”:“ Volvo”}]
響應:400(預計缺少coz engine
)
POST正文:[{“ name”:“ Volvo”,“ engine”:{“ name”:“ volvo_engine”}}]
響應:500(我原本預期為400),但出現錯誤:
由以下原因引起:org.springframework.beans.NotReadablePropertyException:Bean類[java.util.ArrayList]的無效屬性'engine':Bean屬性'id'不可讀或具有無效的getter方法:getter的返回類型是否匹配設置器的參數類型?
發布此內容之前,我查看了其他stackOverflow結果。 如果我接受Car
對象而不是ArrayList<Car>
則一切正常
任何幫助是極大的贊賞。
驗證器在bean上工作,而不是列表; 一種可能的解決方案是將列表包裝在具有list屬性上的@Valid
批注的bean中:
public class MyList<E> {
@Valid
private List<E> list;
public List<E> getList() {
return list;
}
public void setList(List<E> list) {
this.list = list;
}
}
並使用以下命令在控制器中進行驗證:
createModel(@Valid @RequestBody MyList<Car> cars)
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