How do I construct a ConstraintViolationException in Bean Validation 1.0?

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遇见更好的自我
遇见更好的自我 2021-02-12 19:26

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

Sample sample = new Sample();
Set>          


        
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  • 2021-02-12 20:00

    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<ConstraintViolation<?>> for their constraintViolations parameter. Since Set<ConstraintViolation<Sample>> is not a subtype of Set<ConstraintViolation<?>>, 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<? extends ConstraintViolation<?>>. As this is a supertype of Set<ConstraintViolation<Sample>>, 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<ConstraintViolation<?>> instead of Set<ConstraintViolation<Sample>>:

    throw new ConstraintViolationException(
        new HashSet<ConstraintViolation<?>>(violations));
    
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  • 2021-02-12 20:13

    You can work around this like so:

    throw new ConstraintViolationException(
        new HashSet<ConstraintViolation<?>>(violations));
    

    You may be interested in tracking BVAL-198 which addresses this issue.

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