| Re: [eclipselink-users] JPA non-transactional method and entity access: Do I get a reference to the entity or a clone of the entity in the session cache? |
In JPA you will always get a clone back from any find() or Query, Unless: - You mark the object as read-only (@ReadOnly annotation of orm.xml) - You use the "eclipselink.read-only"="true" Query hint I think it would also be useful to be able to get a read-only EntityManager that always returns read-only objects, feel free to log an enhancement request for this. Perhaps a property like "eclipselink.read-only"="true" when creating an EntityManager. zebhed wrote: > > This is a JPA-related question and a performance question. > > I have an EJB that has a method annotated with > "@TransactionAttribute(TransactionAttributeType.NEVER)". In this method, I > am getting an entity via the EntityManager find() method. Let´s assume > that this entity is already in the session cache. > > The question is: > Do I get a clone of the entity or do I get a reference to the entity that > is in the session cache? > > My assumption is that I get a reference to the entity that is in the > session cache. There would be no need to clone an entity that cannot > change. > > Maybe someone can give some insight. Thanks. > ----- --- http://wiki.eclipse.org/User:James.sutherland.oracle.com James Sutherland http://www.eclipse.org/eclipselink/ EclipseLink , http://www.oracle.com/technology/products/ias/toplink/ TopLink Wiki: http://wiki.eclipse.org/EclipseLink EclipseLink , http://wiki.oracle.com/page/TopLink TopLink Forums: http://forums.oracle.com/forums/forum.jspa?forumID=48 TopLink , http://www.nabble.com/EclipseLink-f26430.html EclipseLink Book: http://en.wikibooks.org/wiki/Java_Persistence Java Persistence -- View this message in context: http://www.nabble.com/JPA-non-transactional-method-and-entity-access%3A-Do-I-get-a-reference-to-the-entity-or-a-clone-of-the-entity-in-the-session-cache--tp22790869p22804933.html Sent from the EclipseLink - Users mailing list archive at Nabble.com.