Burner ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=6423fd4... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiYjRhMWRkNTYx... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16393?atlOrigin=eyJpIjoiYjRhMW... ) HHH-16393 ( https://hibernate.atlassian.net/browse/HHH-16393?atlOrigin=eyJpIjoiYjRhMW... ) Bug HHH-8697 seems to be alive in Spring Boot 3.0.4 with Hibernate 6.1.7 ( https://hibernate.atlassian.net/browse/HHH-16393?atlOrigin=eyJpIjoiYjRhMW... ) Change By: Burner ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=6423fd4... ) Bug HHH-8697 seems to be alive in Spring Boot 3.0.4 with Hibernate 6.1.7 only in reverse. I wrote a very simple SQL in a JPA repo and I am wondering that it does not work: {noformat}@Query("SELECT a FROM #{#entityName} a WHERE ((:#{#iValue} IS NULL AND a.value IS NULL) OR a.value = :#{#iValue})") MyEntity findByValue(@Param("iValue") MyDataType value) {noformat} and get the error message: {noformat}Could not determine recommended JdbcType for org.example.MyDataType {noformat} I have now found out that it is based on the check with NULL and the value is not NULL. That means the upper query works without the error message if {{value == null}}. If {{value != null}}, the above error message comes. EDIT: I found a working solution, without #{#…} works like a charm: {noformat}@Query("SELECT a FROM #{#entityName} a WHERE ((:iValue IS NULL AND a.value IS NULL) OR a.value = :iValue)") MyEntity findByValue(@Param("iValue") MyDataType value){noformat} ( https://hibernate.atlassian.net/browse/HHH-16393#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16393#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#100219- sha1:6a6077b )