[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-3432) query.uniqueResult() potentially generates out of memory by calling list()

query.uniqueResult() potentially generates out of memory by calling list() -------------------------------------------------------------------------- Key: HHH-3432 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3432 Project: Hibernate Core Issue Type: Bug Affects Versions: 3.2.6, 3.3.0.CR2 Reporter: Emmanuel Bernard calling list() while the user expects a single result has potential major flow: it's easy to trigger an out of memory situation where nobody would expect it... like getSingleResult("select CURRENT_TIME from AN_ENTITY_CONTAINING_ZILLIONS_OF_RECORDS") ; (and it is also a performance problem when it doesn't trigger the out of heap space... and a design issue: why fetching something the caller is not asking for ? with all the consequences on the cache...) fix: Something like that if (maxResults != 1) query.setMaxResults( 2 ); //avoid OOME if the list is huge List result = query.list(); if ( maxResults != -1 ) query.setMaxResults( maxResults ); //put back the original value