public ValidationError validate(Object value, ExpressionContext expressionContext) {
Iterator validationRulesIt = validationRules.iterator();
while (validationRulesIt.hasNext()) {
ValidationRule validationRule = (ValidationRule) validationRulesIt.next();
ValidationError result = validationRule.validate(value, expressionContext);
if (result != null) return result;
}
return null;
}