How do I construct a ConstraintViolationException in Bean Validation 1.0?

Question

I am puzzled by the javax.validation API. I am writing a simple test to understand it:

Sample sample = new Sample();
Set>          


        

Answer 1

This is a known usability issue in Bean Validation 1.0. This issue was addressed in Bean Validation 1.1 by issue BVAL-198, "Simplify creation of ConstraintViolationExceptions". Upgrading to Bean Validation 1.1 or later will allow your code to compile as written.

The specific issue is that the ConstraintViolationException constructors accepted Set> for their constraintViolations parameter. Since Set> is not a subtype of Set>, it could not be passed into the constructor, with a compilation error occurring when attempting to do so.

Bean validation 1.1.0 changed the constructors to instead accept Set>. As this is a supertype of Set>, it can be passed directly to the constructor.

As mentioned in this other answer, the fix while still on Bean Validation 1.0 was to pass in a Set> instead of Set>:

throw new ConstraintViolationException(
    new HashSet>(violations));