Sanne Grinovero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *created* an issue Hibernate ORM ( https://hibernate.atlassian.net/browse/HHH?atlOrigin=eyJpIjoiZjQyZjc0ODk2... ) / Task ( https://hibernate.atlassian.net/browse/HHH-16963?atlOrigin=eyJpIjoiZjQyZj... ) HHH-16963 ( https://hibernate.atlassian.net/browse/HHH-16963?atlOrigin=eyJpIjoiZjQyZj... ) Avoid H2's capability to register a JVM shutdown hook (causes classloader leaks during tests) ( https://hibernate.atlassian.net/browse/HHH-16963?atlOrigin=eyJpIjoiZjQyZj... ) Issue Type: Task Assignee: Sanne Grinovero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) Components: testsuite Created: 21/Jul/2023 02:25 AM Fix Versions: 6.3.0 Priority: Minor Reporter: Sanne Grinovero ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) The H2 database registers a JVM shutdown hook to ensure database files are properly closed on shutdown. We don’t really need this as we only use it in-memory (H2 also supports databases backed by persistent files ), and it gets in the way as this hook will have a reference to the H2 loading classloader; since we have several integration tests needing isolated or custom classloaders, these classloaders are being leaked. ( https://hibernate.atlassian.net/browse/HHH-16963#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16963#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#100232- sha1:4329f54 )