Puhong You ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-16469 ( https://hibernate.atlassian.net/browse/HHH-16469?atlOrigin=eyJpIjoiMmVkOT... ) Re: Hibernate repeatedly issues identical SELECT queries to load an optional one-to-one association ( https://hibernate.atlassian.net/browse/HHH-16469?atlOrigin=eyJpIjoiMmVkOT... ) Hi, Andrea, Thanks for looking into this. I think your test initialization routine failed to establish the agency ↔︎ group and group ↔︎ user association properly. Can you try this instead? @BeforeAll public void setUp(SessionFactoryScope scope) { scope.inTransaction( session -> { Agency agency = new Agency( 1, "Test Agency" ); Group group = new Group( 1, "Test Group 1" ); agency.addGroup(group); for ( int i = 1; i < 9; i++ ) { User user = new User( i, "User " + i ); agency.addUser(user); group.addUser(user); } session.persist( agency ); } ); } This requires a addGroup() method be added to the Agency entity bean – public void addGroup(Group group){ if (groups == null){ groups = new HashSet<>(); } groups.add( group ); group.setAgency( this ); } Please check the database content after the initialization routine to see if the table contents look ok. Please let me know if you have any further questions. ( https://hibernate.atlassian.net/browse/HHH-16469#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-16469#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#100222- sha1:cb3bdf0 )