Validate a list of nested objects with Spring validator?

Question

I want to know how to validate a list of nested objects in my form with Spring Validator (not annotation) in Spring MVC application.

class MyForm() {
    St         


        

Answer 1

You can use this anywhere in the project

import org.springframework.validation.ValidationUtils;
import org.apache.commons.beanutils.PropertyUtils;
import org.apache.commons.collections.CollectionUtils;

    public static void invokeValidatorForNestedCollection(Validator validator,
                                                      Object obj,
                                                      String collectionPath,
                                                      Errors errors) {

    Collection collection;
    try {
        collection = (Collection) PropertyUtils.getProperty(obj, collectionPath);
    } catch (IllegalAccessException | InvocationTargetException | NoSuchMethodException e) {
        throw new RuntimeException(e);
    }

    if (CollectionUtils.isEmpty(collection)) return;
    int counter = 0;
    for (Object elem : collection) {
        errors.pushNestedPath(String.format(collectionPath + "[%d]", counter));
        ValidationUtils.invokeValidator(validator, elem, errors);
        errors.popNestedPath();
        counter++;
    }
}