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Java Persistence with Hibernate
book

Java Persistence with Hibernate

by Gavin King, Christian Bauer
October 2006
Intermediate to advanced content levelIntermediate to advanced
880 pages
22h 11m
English
Manning Publications
Content preview from Java Persistence with Hibernate

6.2. Collections of components

You could map Image as an entity class and create a one-to-many relationship from Item to Image. However, this isn't necessary, because Image can be modeled as a value type: Instances of this class have a dependent lifecycle, don't need their own identity, and don't have to support shared references.

As a value type, the Image class defines the properties name, filename, sizeX, and sizeY. It has a single association with its owner, the Item entity class, as shown in figure 6.5.

As you can see from the composition association style (the black diamond), Image is a component of Item, and Item is the entity that is responsible for the lifecycle of Image instances. The multiplicity of the association further declares ...

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