Leuteris Katiforis ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5b06ac3... ) *commented* on HHH-14021 ( https://hibernate.atlassian.net/browse/HHH-14021?atlOrigin=eyJpIjoiYWE1MD... ) Re: Using AttributeConverter to Byte fails with "No dialect mapping for JBDC Type: <697960108>" ( https://hibernate.atlassian.net/browse/HHH-14021?atlOrigin=eyJpIjoiYWE1MD... ) Thanks for the detailed description @Steven Walters. According to JDBC API Specification (TABLE B-2), the Java type Byte is mapped to JDBC type TINYINT. I 've added the above mapping and the test runs successfully. Please find my PR at: https://github.com/hibernate/hibernate-orm/pull/3404 ( https://hibernate.atlassian.net/browse/HHH-14021#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-14021#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#100126- sha1:acdbdcc )