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|previous=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/orm.xml|orm.xml]]
|previous=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/orm.xml|Specifying Object-Relational Mappings Using orm.xml]]
|next=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/eclipselink-orm.xml|eclipselink-orm.xml]]
|next=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/eclipselink-orm.xml|Specifying EclipseLink Object-Relational Mappings Using eclipselink-orm.xml]]
|up=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration|Configuration]]
|up=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration|Configuration]]
|version=2.2.0 DRAFT}}
|version=2.2.0 DRAFT}}

Revision as of 10:46, 19 April 2011

EclipseLink JPA

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About the Default Configuration Values

Each annotation has a default value (consult the JPA specification for defaults). A persistence engine defines defaults that apply to the majority of applications. You only need to supply values when you want to override the default value. Therefore, having to supply a configuration value is not a requirement, but the exception to the rule. This is known as configuration by exception.

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Note: You should be familiar with the defaults to be able to change the behavior when necessary.

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For more information, see Chapter 10 "Metadata Annotations" in the JPA Specification.

Version: 2.2.0 DRAFT
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