Top Description Methods
jakarta.persistence

public @Interface ElementCollection

extends Annotation
Annotations
@Target:METHOD, FIELD
@Retention:RUNTIME
Imports
java.lang.annotation.Target, .Retention
Declares 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.

The CollectionTable annotation specifies a mapping to a database table.

Example:

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

Method Summary

Modifier and TypeMethod and Description
public FetchType
fetch()

(Optional) Whether the collection should be lazily loaded or must be eagerly fetched.

public Class<?>
targetClass()

(Optional) The basic or embeddable class that is the element type of the collection.

Inherited from java.lang.annotation.Annotation:
annotationTypeequalshashCodetoString

Method Detail

fetchback to summary
public 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 associated entity must be eagerly fetched.
  • The LAZY strategy is a hint to the persistence provider runtime.

If not specified, defaults to LAZY.

targetClassback to summary
public 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 parameterized type of the collection when defined using generics.