Pro JPA 2 in Java EE 8: An In-Depth Guide to Java Persistence APIs

© Mike Keith, Merrick Schincariol, Massimo Nardone 2018

Mike Keith, Merrick Schincariol and Massimo NardonePro JPA 2 in Java EE 8https://doi.org/10.1007/978-1-4842-3420-4_5

5. Collection Mapping

Mike Keith¹ , Merrick Schincariol² and Massimo Nardone³

(1)

Ottawa, Ontario, Canada

(2)

RR 3, RR 3, Almonte, Ontario, Canada

(3)

Helsinki, Finland

 

Sometimes a collection is used like a milk crate: it’s just a simple container with no apparent order or intended organization. Other cases demand some kind of system of order and arranging so the way objects are retrieved from the collection has meaning. Whether the collection is of the first type or the second, collections of objects require more effort to map than single objects, although in compensation they offer ...