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<title>Key Features | EclipseLink 3.0.x Understanding EclipseLink</title>
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<td align="left" valign="top"><div class="booktitle">Understanding EclipseLink,
<b>3.0</b><br /></font></td>
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<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Key Features</font></h1>
<p>An extensive set of features are provided. You can use these features to rapidly build high-performance enterprise applications that are scalable and maintainable.</p>
<p>Some of the primary features are the following:</p>
<ul>
<li>
<p>Nonintrusive, flexible, metadata-based architecture</p>
</li>
<li>
<p>Advanced mapping support and flexibility: relational, object-relational data type, and XML</p>
</li>
<li>
<p>Optimized for highly scalable performance and concurrency with extensive performance tuning options</p>
</li>
<li>
<p>Comprehensive object caching support including cluster integration for some application servers (such as Oracle Fusion Middleware Server)</p>
</li>
<li>
<p>Extensive query capability including: Java Persistence Query Language (JPQL), native SQL, and EclipseLink Expressions framework</p>
</li>
<li>
<p>Just-in-time reading</p>
</li>
<li>
<p>Object-level transaction support and integration with popular application servers and databases</p>
</li>
<li>
<p>Optimistic and pessimistic locking options and locking policies</p>
</li>
</ul>
<p>For additional information and downloads, see the EclipseLink home page:</p>
<p><code><a href="http://www.eclispe.org/eclipselink/">http://www.eclispe.org/eclipselink/</a></code></p>
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