Puhong You ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-15453 ( https://hibernate.atlassian.net/browse/HHH-15453?atlOrigin=eyJpIjoiN2JlM2... ) Re: java.lang.NullPointerException: Cannot invoke "org.hibernate.engine.spi.EntityEntry.getEntityKey()" because "ownerEntry" is null ( https://hibernate.atlassian.net/browse/HHH-15453?atlOrigin=eyJpIjoiN2JlM2... ) Notes: 1. the User with userId = 1 has a row in the USER_ROLE association table, and the query works. The user with userId = 2 has no row in the USER_ROLE association table, and the query throws java.lang.NullPointerException. 2. In the User.java entity bean, if I change the FetchMode for the roles collection from @Fetch(FetchMode.SUBSELECT)to @Fetch(FetchMode.JOIN), both queries work. ( https://hibernate.atlassian.net/browse/HHH-15453#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15453#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#100204- sha1:f005d5a )