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Why two xml files?
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Joe Harry
Ranch Hand
Joined: Sep 26, 2006
Posts: 8795
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Guys,
What is the need for orm.xml and persistence.xml files?
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SCJP 1.4, SCWCD 1.4 - Hints for you, SCBCD Hints - Demnachst, SCDJWS - Auch Demnachst
Did a rm -R / to find out that I lost my entire Linux installation!
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Leandro Siqueira
Greenhorn
Joined: Jun 05, 2005
Posts: 6
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persistence.xml defines the identities and configuration properties of persistence units; orm.xml is optional and defines the mapping between classes and persistence units.
[ October 22, 2008: Message edited by: Leandro Siqueira ]
[ October 22, 2008: Message edited by: Leandro Siqueira ]
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Joe Harry
Ranch Hand
Joined: Sep 26, 2006
Posts: 8795
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If I do not provide an orm.xml file, then the persistence provider will automatically map my POJO's based on the metadata annotations that I have. Am I right in this sense?
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Leandro Siqueira
Greenhorn
Joined: Jun 05, 2005
Posts: 6
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exactly!
and if you have both, xml overrides the annotations.
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Joe Harry
Ranch Hand
Joined: Sep 26, 2006
Posts: 8795
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If I were to relate this with Hibernate, a persistence.xml is something like a hibernate-cfg.xml and the orm.xml is like a mapping xml that we have in Hibernate.
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Chaminda Amarasinghe
Ranch Hand
Joined: May 17, 2006
Posts: 402
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Yes you are correct
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subject: Why two xml files?
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