Julien Ravet ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-16671 ( https://hibernate.atlassian.net/browse/HHH-16671?atlOrigin=eyJpIjoiMDA5YT... ) Re: Unable to query key attribute that uses AttributeConverter ( https://hibernate.atlassian.net/browse/HHH-16671?atlOrigin=eyJpIjoiMDA5YT... ) Just to let you know I’m encountering the same kind of issue, trying to make YearMonth persistence work with Hibernate 6. @Type or @JavaType doens’t work either, even using a home made type or java Type (not the hypersistence one) I will post the corresponding error message and code today ( https://hibernate.atlassian.net/browse/HHH-16671#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16671#add-comment?atlOrigin=ey... ) 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#100225- sha1:d82e018 )