Spring custom validation annotation + Validator implementation - spring

Question

I have a simple POJO which is considered valid if one of the 2 attributes (ssn / clientId) is populated. I have written a custom Spring Validator to do the validation.
The question I have is, is there a way I can annotate my POJO so that my custom Validator is invoked for validation automatically? I'm trying to avoid manually invoking it from multiple places.
public class QueryCriteria {
#NotNull
private QueryBy queryBy;
private String ssn;
private String clientId;
}
public class QueryCriteriaValidator implements org.springframework.validation.Validator {
#Override
public boolean supports(Class<?> clazz) {
return QueryCriteria.class.equals(clazz);
}
#Override
public void validate(Object target, Errors errors) {
QueryCriteria criteria = (QueryCriteria) target;
switch (criteria.getQueryBy()){
case CLIENT:
//validation logic
break;
case SSN:
//validation logic
break;
default:
break;
}
}
}

Answer 1

With Spring MVC, just add the custom validator to your controller's data binder:
#Autowired
private QueryCriteriaValidator validator;
#InitBinder
public void initializeBinder(WebDataBinder binder) {
binder.addValidators(validator);
}
Otherwise, you'll want to inject the custom validator and call it yourself.
#Autowired
private QueryCriteriaValidator validator;
public void process(QueryCriteria criteria) {
check(validator.validate(criteria));
// Continue processing.
}

Answer 2

Só you can create your own validation. Example :
#RequiredParam
#RegexpValidation("^[\\p{IsLatin}]{2}[\\p{IsLatin}-]* [\\p{IsLatin}]{2}[\\p{IsLatin}- ]*$")
private String name;
Create a class validator e send the form that you want to validate:
Map<String, String> invalidFieldMap = Validator.validate(form);
if (invalidFieldMap.size() > 0)
{
LOGGER.warn("Invalid parameters");
}
Look this gist Validator.java https://gist.github.com/cmsandiga/cb7ab4d537ef4d4691f7