try {
Map<String, Person> personMap = (Map<String, Person>) system.query(new GetPerson());
for (Person person : personMap.values()) {
if(!Validator.isDate(person.getBirthDate())) {
person.setBirthDate("01/01/1900");
system.executeAndQuery(new UpdatePerson(person));
}
}
} catch (Exception e) {
e.printStackTrace();
}