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Difference between revisions of "EclipseLink/Examples/OSGi"

(OSGi)
(Replacing page with 'The OSGi support provided by EclipseLink is deprecated and has been replace by the Gemini JPA project. See the Gemini documentation for examples.')
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== OSGi ==
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The OSGi support provided by EclipseLink is deprecated and has been replace by the Gemini JPA projectSee the [[Gemini/JPA/Documentation|Gemini documentation]] for examples.
 
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=== Importing Javax.Persistence 2.0 ===
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In March of 2010, the OSGi Alliance released the OSGi Enterprise Specification which defines how a number of Java EE technologies including JPA can be used within OSGi.  The [http://www.eclipse.org/gemini Gemini] project (based on EclipseLink) is building the Enterprise OSGi JPA spec implementation which will make the existing EclispeLink OSGi support, which pre-dates the specification, obsolete.  You can try out a milestone of [http://www.eclipse.org/gemini Gemini] today or use the existing EclipseLink OSGi support.  Links to examples of EclipseLink OSGi usage are provided below.
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One issue raised by the OSGi Enterprise Specification is how to identify each API version as Java EE numbering is not based on the same strict rules as OSGi.  For example, by the OSGi versioning rules JPA 2.0 should really be 1.1 as it is fully backwards compatible with JPA 1.0 and adds additional API.  To resolve this conflict EclipseLink will provide support for JPA 1.1 (OSGi numbering) but will tag each package export with a "jpa" attribute to allow importers to specify the Java EE specification number independent of the OSGi version.   
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So, to use JPA 2.0 in OSGi you would use the following import package declaration:
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<pre>
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Import-Package: javax.persistence;version="1.1.0";jpa="2.0"
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</pre>
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Prior to the definition of the OSGi Enterprise specification, EclipseLink shipped a JPA 2.0 preview bundle versioned as 1.99, but without a jpa attribute specified.  By specifying jpa="2.0" you can ensure that the preview bundle is not used even when you specify the OSGi Enterprise spec JPA version of 1.1.0.
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=== Examples ===
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Examples that illustrate the use of EclipseLink in OSGi applications
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* [[EclipseLink/Examples/OSGi/Developing with EclipseLink OSGi in PDE|Developing with EclipseLink OSGi in PDE]]
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* [[EclipseLink/Examples/OSGi/Equinox Byte Code Weaving|Equinox Byte Code Weaving]]
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* [[EclipseLink/Examples/OSGi/LazyLoadingRCP|Using EclipseLink JPA in an RCP application]]
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==Eclipse Rich Client Platform (RCP)==
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Examples that show how to use EclipseLink in RCP Applications.
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* [[EclipseLink/Examples/OSGi/LazyLoadingRCP|Lazy Loading RCP Tree Example]]
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[[Category:EclipseLink/Example|OSGi Examples]]
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==Eclipse Rich Client Platform (RCP)==
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Examples that show how to use EclipseLink in RCP Applications.
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* [[EclipseLink/Examples/OSGi/LazyLoadingRCP|Lazy Loading RCP Tree Example]]
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[[Category:EclipseLink/Example|OSGi Examples]]
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Revision as of 08:49, 24 October 2012

The OSGi support provided by EclipseLink is deprecated and has been replace by the Gemini JPA project. See the Gemini documentation for examples.