java - hibernate validator for cross field validation

Question

I have a question about hibernate validator:

class A
{
  private String a;
  private String b;
}

String a and b can either be null but can't both be null. How can I use Hibernate Validator to validate this case?

Thanks,

Answer 1

Use a custom class level validator to do this.

From the Hibernate Validator Reference:

• Class-level constraints
• Creating Custom Constraints