javax.persistence

Annotation Type ElementCollection

Contents

  • @Target(value={METHOD,FIELD})
 @Retention(value=RUNTIME)
public @interface ElementCollection
    Specifies a collection of instances of a basic type or embeddable class. Must be specified if the collection is to be mapped by means of a collection table. 
        Example:

    @Entity public class Person {
       @Id protected String ssn;
       protected String name;
       ...
       @ElementCollection  
       protected Set<String> nickNames = new HashSet();
         ...
    }
    Since:
    Java Persistence 2.0

    • Element Detail

      • targetClass

        public abstract Class targetClass
        (Optional) The basic or embeddable class that is the element type of the collection. This element is optional only if the collection field or property is defined using Java generics, and must be specified otherwise. It defaults to the paramterized type of the collection when defined using generics.
        Default:
        void.class

      • fetch

        public abstract FetchType fetch
        (Optional) Whether the collection should be lazily loaded or must be eagerly fetched. The EAGER strategy is a requirement on the persistence provider runtime that the collection elements must be eagerly fetched. The LAZY strategy is a hint to the persistence provider runtime.
        Default:
        javax.persistence.FetchType.LAZY

Document created the 11/06/2005, last modified the 18/08/2025
Source of the printed document:https://www.gaudry.be/en/java-api-javaee-rf-javax/persistence/ElementCollection.html

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References

  1. View the html document Language of the document:fr Manuel PHP : https://docs.oracle.com, ElementCollection (Java(TM) EE 7 Specification APIs)

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