[hibernate-issues] [JIRA] (HV-1794) Optional containing a list of items is not being validated

Ihor Mochurad ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ccb2fc... ) *created* an issue Hibernate Validator ( https://hibernate.atlassian.net/browse/HV?atlOrigin=eyJpIjoiNmI3MTAxMzhmN... ) / Bug ( https://hibernate.atlassian.net/browse/HV-1794?atlOrigin=eyJpIjoiNmI3MTAx... ) HV-1794 ( https://hibernate.atlassian.net/browse/HV-1794?atlOrigin=eyJpIjoiNmI3MTAx... ) Optional containing a list of items is not being validated ( https://hibernate.atlassian.net/browse/HV-1794?atlOrigin=eyJpIjoiNmI3MTAx... ) Issue Type: Bug Affects Versions: 6.0.18.Final Assignee: Unassigned Components: engine Created: 22/Jul/2020 15:46 PM Priority: Major Reporter: Ihor Mochurad ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5ccb2fc... ) As a user of Hibernate Validator, I would expect that a field like `private Optional<List<ConsumerGroupDTO>> consumerGroups;` where `ConsumerGroupDTO` is the following pojo: @Data @SuperBuilder @NoArgsConstructor public class ConsumerGroupDTO extends ConsumerDTO { private @NotEmpty String consumerGroupId; private boolean simpleConsumerGroup; } 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: public class OptionalListValueExtractor<T> implements ValueExtractor<@ExtractedValue(type = List.class) Optional<List<T>>> { @Override public void extractValues(@ExtractedValue(type = List.class) Optional<List<T>> originalValue, ValueReceiver valueReceiver) { valueReceiver.value( null , originalValue.orElse( null )); } } but when I register this class as a service, I get an exception with the cause: Caused by: javax.validation.valueextraction.ValueExtractorDefinitionException: HV000225: Only unbound wildcard type arguments are supported for the container type of the value extractor: com.solace.maas.event.core.validation.OptionalListValueExtractor. 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 efficiency. Looking forward to your reply! ( https://hibernate.atlassian.net/browse/HV-1794#add-comment?atlOrigin=eyJp... ) Add Comment ( https://hibernate.atlassian.net/browse/HV-1794#add-comment?atlOrigin=eyJp... ) Get Jira notifications on your phone! Download the Jira Cloud app for Android ( https://play.google.com/store/apps/details?id=com.atlassian.android.jira.... ) or iOS ( https://itunes.apple.com/app/apple-store/id1006972087?pt=696495&ct=Em... ) This message was sent by Atlassian Jira (v1001.0.0-SNAPSHOT#100133- sha1:ead1094 )