When hibernate.globally_quoted_identifiers is set to true, defining custom @UniqueConstraint is not possible. Error message is: "org.hibernate.AnnotationException: Unable to create unique key constraint (<columns>) on table <table>: database column <column> not found. Make sure that you use the correct column name which depends on the naming strategy in use (it may not be the same as the property name in the entity, especially for relational types)".