Stefan Mitzkus ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5a27b49... ) *updated* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiZDY0ZTk0OTE0... ) / Bug ( https://hibernate.atlassian.net/browse/HHH-16455?atlOrigin=eyJpIjoiZDY0ZT... ) HHH-16455 ( https://hibernate.atlassian.net/browse/HHH-16455?atlOrigin=eyJpIjoiZDY0ZT... ) calling oracle function returns Integer instead of BigDecimal ( https://hibernate.atlassian.net/browse/HHH-16455?atlOrigin=eyJpIjoiZDY0ZT... ) Change By: Stefan Mitzkus ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=5a27b49... ) Calling the following oracle function with Hibernate 6.1.7 returns an BigInteger of value 1.23: {code:java} create or replace Function  "HIBERNATE_TEST" RETURN NUMBER is d_RET DECIMAL(5,2); BEGIN d_RET := 1.23; return d_RET; END; {code} The function is called as follows: {code:java} public BigDecimal hibernateTest() { Object result = entityManager .createNativeQuery( "SELECT HIBERNATE_TEST() FROM DUAL") .getSingleResult(); return (BigDecimal) result; // 1.23 } {code} Calling the same function with the same code as above with Hibernate 6.2.0 returns an Integer of value 1 which  causes an ClassCastException. ( https://hibernate.atlassian.net/browse/HHH-16455#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16455#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#100221- sha1:9ff53d8 )