Steven Walters ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiNWU3NWI2MGE5... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-14021?atlOrigin=eyJpIjoiNWU3NW... ) HHH-14021 ( https://hibernate.atlassian.net/browse/HHH-14021?atlOrigin=eyJpIjoiNWU3NW... ) Using AttributeConverter to Byte fails with "No dialect mapping for JBDC Type: <697960108>" ( https://hibernate.atlassian.net/browse/HHH-14021?atlOrigin=eyJpIjoiNWU3NW... ) Issue Type: Bug Affects Versions: 5.3.17, 5.4.15, 6.0.0.Alpha5 Assignee: Unassigned Attachments: hibernate-byte-converter-issue.zip Components: hibernate-core Created: 15/May/2020 05:12 AM Priority: Major Reporter: Steven Walters ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) When attempting to use an AttributeConverter that converts the attribute to a Byte type, hibernate generates an error of Where the integer value listed seems to be some random value. However, using Short, works. On several projects, we're wanting to utilize byte values to store enumerated types instead of inefficient text strings. For now, we're working around it by using Short instead, but obviously this uses double the size per enum per row. hibernate-byte-converter-issue.zip ( https://hibernate.atlassian.net/secure/attachment/49684/49684_hibernate-b... ) I've attached a small test project to exemplify the issue. can use mvn clean verify -Phibernate53 mvn clean verify -Phibernate54 mvn clean verify -Phibernate60 to run with 5.3.17.Final, 5.4.15.Final, and 6.0.0.Alpha5 respectively. ( 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 )