JSR-303 Bean Validation annotate multiple fields

Question

I\'ve just started testing JSR-303 Bean validation and was wondering if something was possible. We have a default regular expression in our app for all String fields. If I

Answer 1

I didnt use but java supporting scripting in server side using grovvy ,javascript.. .You can check @ScriptAssert(lang = "javascript", script =_this.startDate.before(_this.endDate) scripting annotation which is hibernate annotation.

Answer 2

To validate more than one field at once, use an annotation on type-Level and write a custom Validator that checks all String fields using your REGEXP.

Edit: Provide example. This is quite ugly, because it uses Reflection and violates security, but maybe it gives you a general idea. If you dont use "object" but a concrete class or interface, you could possibly have success with regular getters.

The Class under Test (and the Runner)

   import javax.validation.Validation;
import javax.validation.Validator;

import validation.AllStringsRegex;

@AllStringsRegex(value="l")
public class UnderValidation {
    String a;
    String b;

   public static void main(String... args) {
       UnderValidation object = new UnderValidation();
       object.a = "hello";
       object.b = "world";

       Validator validator = Validation.buildDefaultValidatorFactory().getValidator();
       System.out.println(validator.validate(object));
   }
}

My Annotation:

@Target( { TYPE, ANNOTATION_TYPE })
@Retention(RUNTIME)
@Constraint(validatedBy = AllStringsRegexValidator.class)
@Documented
public @interface AllStringsRegex {
    String message() default "String not regex";
    String value() default "";
    Class<?>[] groups() default {};
    Class<? extends Payload>[] payload() default {};
}

My Validator

public class AllStringsRegexValidator implements ConstraintValidator<AllStringsRegex, Object> {
    private Pattern pattern = null;

    @Override
    public void initialize(AllStringsRegex annotation) {
        pattern = Pattern.compile(annotation.value());
    }

    @Override
    public boolean isValid(Object object, ConstraintValidatorContext ctx) {
        for (Field f : object.getClass().getDeclaredFields()) {
            if (f.getType().equals(String.class)) {
                try {
                    f.setAccessible(true);
                    String value = (String)f.get(object);
                    if (!pattern.matcher(value).find()) {
                        return false;
                    }
                }
                catch (Exception e) {
                    // TODO Auto-generated catch block
                    e.printStackTrace();
                }
            }
        }
        return true;
    }
}