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Difference between revisions of "EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/Defaults"

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=Defaults=
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{{EclipseLink_UserGuide
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|info=y
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|eclipselink=y
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|eclipselinktype=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''.
 
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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{{EclipseLink_Note
'''Note''': You should be familiar with the defaults to be able to change the behavior when necessary.  
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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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{{EclipseLink_Spec
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|link=http://jcp.org/en/jsr/detail?id=220
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|section=Chapter 10 "Metadata Annotations"
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}}
  
 
{{EclipseLink_JPA
 
{{EclipseLink_JPA
|previous=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration/JPA/orm.xml|orm.xml]]
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|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]]
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|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]]}}
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|up=[[EclipseLink/UserGuide/JPA/Basic JPA Development/Configuration|Configuration]]
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|version=2.2.0 DRAFT}}

Revision as of 09:46, 19 April 2011

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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.

Elug note icon.png

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

Elug javaspec icon.gif

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

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Version: 2.2.0 DRAFT
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