Spring validation JSR-303 @NotNull throw NotReadablePropertyException

Question

I have two classes

@Data
@NoArgsConstructor
public class SearchProductOffer {
    @Valid
    private List<MatchProperty> properties = new ArrayList<>();
}
@Data
@NoArgsConstructor
public class MatchProperty {
    private String version;
    private String sourceSystem;
    @NotNull(message = "Версия должна быть заполнена!")
    public String codeName;
}

while i validate A with ValidationUtil.invokeValidator i get

2018-07-06 16:04:09.769 ERROR 10223 --- [nio-8080-exec-1] o.a.c.c.C.[.[.[/].[dispatcherServlet] : Servlet.service() for servlet [dispatcherServlet] in context with path [] threw exception [Request processing failed; nested exception is java.lang.IllegalStateException: JSR-303 validated property 'properties[1].codeName' does not have a corresponding accessor for Spring data binding - check your DataBinder's configuration (bean property versus direct field access)] with root cause

org.springframework.beans.NotReadablePropertyException: Invalid property 'properties[1]' of bean class [java.lang.String]: Bean property 'properties[1]' is not readable or has an invalid getter method: Does the return type of the getter match the parameter type of the setter? at org.springframework.beans.AbstractNestablePropertyAccessor.getPropertyValue(AbstractNestablePropertyAccessor.java:622) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]

when fieldB is null. Both classes have getter/setter. Spring Boot 2.0.3.RELEASE

UPDATE I get exception every time, while i want validate with @NotNull(while field value is null) or @NotEmpty(while my field is "") field in inner class.

The error message doesn't seem to have anything to do with your code. Post real code that reproduces the issue, with the real and complete exception stack trace. — JB Nizet
i use lombok @Data and in *.class files i saw getters and setters — Igor Fedorov
I would say the problem is not validation but incorrect path in your HTML. Looks that you use properties[1] somewhere in your path. Please post the JSP you use — StanislavL
I use jackson objectMapper to get object from json. After deserialize i get normal java object and some fields has null value. Field with null value annotated with @NotNull (codeName). I call SmartValidator.validate and then i get exception. I validate full valid java object and SmartValidator.validate must create FieldError from codeName field, but it throw exception — Igor Fedorov

Igor Fedorov Igor Fedorov · Accepted Answer · 2018-07-09T06:50:09

Solution: remove spring SmartValidator. Configure binder in controller

@InitBinder
    private void initBinder(WebDataBinder dataBinder) {
        dataBinder.initDirectFieldAccess();
    }

Configure validator in boot config

@Bean
    public LocalValidatorFactoryBean getValidator() {
        return new LocalValidatorFactoryBean();
    }

And inject it into controller

@Autowired
    private LocalValidatorFactoryBean validator;

after it we can call

List<ConstraintViolation<Object>> validationResult = new ArrayList<>();
validationResult.addAll(validator.validate(request));   
validationResult.addAll(validator.validate(methodBean));

and check validationResult for validation errors

Spring validation JSR-303 @NotNull throw NotReadablePropertyException

1 Answers