Validation of constructor constraints
by Hardy Ferentschik
Hi everyone,
I hope you had some time to experiment with the functionality in Hibernate Validator 5.0.0.Alpha1.
One question Gunnar and I discussed when implementing the latest spec was constructor validation and constraints on super types.
Probably best to use an example:
public class Foo {
Foo(@Length(max = 10) String s) {
}
Foo(@Min(5) Integer i) {
}
public void foobar(@NotNull String s) {
// ...
}
}
public class Bar extends Foo {
public Bar(String s) {
super( s );
}
public void foobar(String s) {
// ...
}
}
In this case we have Bar extending Foo. What happens if Bar#foobar is called? In this case the @NotNull constraint from
Foo#foobar get applied. So far so good. The question is what happens with constructor validation?
In the example Bar has one constructor which defines no constraint. The matching super type constructor Foo(String) defines
an @Length constraint. Should this constraint be applied? In the example Bar(String) calls the corresponding string constructor
in the super type, but it might as well call the integer constructor. There is no telling from a Bean Validation point of view.
For this reason Hibernate Validator does not apply any super types constraints when validating constructors. We think that is
the right behavior, but wanted to run this by everyone. Either way it is probably worth to clarify the spec around this.
Thoughts?
--Hardy
12 years
- 3
- 3
Javascript export of bean validation rules
by Michael Isvy
Hi,
I was discussing this topic with Emmanuel Bernard by email and Emmanuel
suggested that we move this conversation to this mailing-list, so here I
am :).
The idea would be to propose a javascript export of the bean validation
rules. In that way, it would become fairly easy to do "true client side
validation" (that is: validation that does not require access to the
server side until the form is completely valid, or nearly completely
valid).
Many web technologies such as JSF, Spring MVC, Wicket, Tapestry...
integrate with JSR 303. Providing such export would be of great help for
users of those frameworks (or standard in the case of JSF).
Cheers,
Michael.
12 years
- 4
- 4