Christian Beikov ( https://hibernate.atlassian.net/secure/ViewProfile.jspa?accountId=557058%... ) *commented* on HHH-15452 ( https://hibernate.atlassian.net/browse/HHH-15452?atlOrigin=eyJpIjoiMmI3ND... ) Re: Predicate add expression results in UnsupportedOperationException ( https://hibernate.atlassian.net/browse/HHH-15452?atlOrigin=eyJpIjoiMmI3ND... ) You do understand that the JPA specification requires that, and I cite from the Javadoc of Predicate#getExpressions : So your code is broken and only worked by accident in previous Hibernate versions. The proper way to do this is: Predicate conjuncion = builder.conjunction(); Predicate expr = builder.equal(rootClaseGrid.get( "documento" ), "AAAA" ); cq.where(builder.and(conjunction, expr)); Since the Javadoc seem to imply that modifications are allowed, I agree that this is a bug. The bug is, that we should return mutable lists, possibly copies of the original list. ( https://hibernate.atlassian.net/browse/HHH-15452#add-comment?atlOrigin=ey... ) Add Comment ( https://hibernate.atlassian.net/browse/HHH-15452#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 )