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 <div class="sect1"><!-- infolevel="all" infotype="General" -->
 <h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Using Weaving</font></h1>
 <p>Weaving is a technique of manipulating the byte-code of compiled Java classes.</p>
 <p>EclipseLink uses weaving to enhance Plain Old Java Object (POJO) classes and JPA entities with many features such lazy loading, change tracking, fetch groups, and internal optimizations.</p>
 <a id="TLADG1085" name="TLADG1085"></a>
 <div class="sect2"><a id="sthref141" name="sthref141"></a>
 <h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">How to Disable or Enable Weaving in a Java SE Environment</font></h2>
 <p>In a Java SE environment weaving is not enabled by default. This can affect LAZY One-To-One, Many-To-One and Basic relationships. It also has a major effect on performance and disable attribute change tracking.</p>
 <p>To enable weaving in Java SE, the EclipseLink agent must be used when starting the Java VM.</p>
 <pre xml:space="preserve" class="oac_no_warn">
 java -javaagent:eclipselink.jar
 </pre>
 <p>Spring could also be used to allow JPA weaving in Java SE. See <code><a href="http://wiki.eclipse.org/EclipseLink/Examples/JPA/JPASpring">http://wiki.eclipse.org/EclipseLink/Examples/JPA/JPASpring</a></code> for more information.</p>
 <p>Static weaving can also be used, by including the following persistence property,</p>
 <pre xml:space="preserve" class="oac_no_warn">
 &lt;property name="eclipselink.weaving" value="static"/&gt;

 </pre>
 <p>See "weaving" in <em>Java Persistence API (JPA) Extensions Reference for EclipseLink</em> for more information.</p>
 </div>
 <!-- class="sect2" -->
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 <div class="sect2"><!-- infolevel="all" infotype="General" --><a id="sthref142" name="sthref142"></a>
 <h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">How to Disable or Enable Weaving in a Java EE Environment</font></h2>
 <p>In a Java EE environment weaving is enabled by default (on any Java EE 5 or greater fully compliant application server, such as Weblogic, Webspehere, and Glassfish. JBoss does not allow weaving so you must use static weaving or Spring).</p>
 <p>To disable weaving the weaving persistence unit property can be used,</p>
 <pre xml:space="preserve" class="oac_no_warn">
 &lt;property name="eclipselink.weaving" value="false"&gt;

 </pre>
 <p>For more information on weaving see "weaving" in <em>Java Persistence API (JPA) Extensions Reference for EclipseLink</em>.</p>
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	<div class="sect1"><!-- infolevel="all" infotype="General" -->
	<h1 class="sect1"><font face="arial, helvetica, sans-serif" color="#330099">Using Weaving</font></h1>
	<p>Weaving is a technique of manipulating the byte-code of compiled Java classes.</p>
	<p>EclipseLink uses weaving to enhance Plain Old Java Object (POJO) classes and JPA entities with many features such lazy loading, change tracking, fetch groups, and internal optimizations.</p>
	<a id="TLADG1085" name="TLADG1085"></a>
	<div class="sect2"><a id="sthref141" name="sthref141"></a>
	<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">How to Disable or Enable Weaving in a Java SE Environment</font></h2>
	<p>In a Java SE environment weaving is not enabled by default. This can affect LAZY One-To-One, Many-To-One and Basic relationships. It also has a major effect on performance and disable attribute change tracking.</p>
	<p>To enable weaving in Java SE, the EclipseLink agent must be used when starting the Java VM.</p>
	<pre xml:space="preserve" class="oac_no_warn">
	java -javaagent:eclipselink.jar
	</pre>
	<p>Spring could also be used to allow JPA weaving in Java SE. See <code><a href="http://wiki.eclipse.org/EclipseLink/Examples/JPA/JPASpring">http://wiki.eclipse.org/EclipseLink/Examples/JPA/JPASpring</a></code> for more information.</p>
	<p>Static weaving can also be used, by including the following persistence property,</p>
	<pre xml:space="preserve" class="oac_no_warn">
	<property name="eclipselink.weaving" value="static"/>

	</pre>
	<p>See "weaving" in <em>Java Persistence API (JPA) Extensions Reference for EclipseLink</em> for more information.</p>
	</div>
	<!-- class="sect2" -->
	<a id="TLADG1086" name="TLADG1086"></a>
	<div class="sect2"><!-- infolevel="all" infotype="General" --><a id="sthref142" name="sthref142"></a>
	<h2 class="sect2"><font face="arial, helvetica, sans-serif" color="#330099">How to Disable or Enable Weaving in a Java EE Environment</font></h2>
	<p>In a Java EE environment weaving is enabled by default (on any Java EE 5 or greater fully compliant application server, such as Weblogic, Webspehere, and Glassfish. JBoss does not allow weaving so you must use static weaving or Spring).</p>
	<p>To disable weaving the weaving persistence unit property can be used,</p>
	<pre xml:space="preserve" class="oac_no_warn">
	<property name="eclipselink.weaving" value="false">

	</pre>
	<p>For more information on weaving see "weaving" in <em>Java Persistence API (JPA) Extensions Reference for EclipseLink</em>.</p>
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