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Dali Project/specs/3.0/2.0ElementCollection

< Dali Project‎ | specs/3.0
Revision as of 15:50, 14 December 2009 by (Talk | contribs) (Requirements / Functionality)

Functional Specification: Dali Support for JPA 2.0 Element Collection mapping


bug 258490 - element collection support

Document History

Date Author Version Description & Notes
12-9-2009 Karen Butzke Draft

Project overview

This feature covers the element collection mapping in the JPA 2.0 spec as well as any EclipseLink extensions.


  • Add Generic 2.0 support for Element Collection
  • Add EclipseLink 3.0 support for Element Collection with relevant extensions
  • Provide the appropriate defaults and validation for these settings


Present any concepts relevant to the feature.

EclipseLink Element Collection Functional Spec

Requirements / Functionality

Element Collection with Basic Type

  • Target Class - defaults to type of the Collection if it is generic
  • Fetch - defaults to Lazy
  • Collection Table
    • Name defaults to <Entity name>_<attribute name>
  • Column
    • Name default to attribute name
    • Table defaults to collection table name and is not editable

Element Collection Basic Type Details


Ordering Section


Element Collection with Embeddable Type

  • Attribute and Association override names are derived from the Embeddable type

Element Collection Embeddable Type Details


Element Collection Map Basic Types

  • column and @Column
  • map-key-column and @MapKeyColumn
  • map-key-temporal and @MapKeyTemporal
  • map-key-enumerated and @MapKeyEnumerated
  • map-key-convert and @MapKeyConvert
  • Fetch - defaults to Lazy
  • collection-table and @Collection Table
    • Name defaults to <Entity name>_<attribute name>

Element Collection Map with Basic Key and Basic Value Details


Element Collection Map Embeddable Key

  • Overrides
    • In Xml use map-key-attribute-override and map-key-association-override
    • In Java use AttributeOverride(name="key.<name>") and AttributeOverride(name="value.<name>)


Element Collection Map Entity Key

  • MapKeyJoinColumn
  • MapKeyJoinColumns




This section lists the open issues that are still pending that must be decided prior to fully implementing this project's requirements.

Issue # Owner Description / Notes Decision

Future Considerations

During the research for this project the following items were identified as out of scope but are captured here as potential future enhancements. If agreed upon during the review process these should be logged in the bug system.

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