Optional containing a list of items is not being validated

Description

As a user of Hibernate Validator, I would expect that a field like

where ConsumerGroupDTO is the following pojo:

gets properly validated and constraint violation exception will be thrown in case consumerGroupId value will be set either to null or an empty string, instead validation does not kick-in for the list of pojos wrapped in the Optional.

If the value of Optional is a pojo or a primitive, validation rules are working fine.

I did a little bit more digging and tried to write my own value extractor:

but when I register this class as a service, I get an exception with the cause:

It seems it doesn't like that I have a class type specified in my Optional. But without this generic, it is impossible to have the extractor working the right way.

Anyways, I think it is either a bug in HV or a functional deficiency.

Looking forward to your reply!

Environment

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Reporter

Ihor Mochurad

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