<div class="block">Specifies whether the persistence context is always automatically 
 synchronized with the current transaction or whether the persistence context
 must be explicitly joined to the current transaction by means of the
 <a href="EntityManager.html#joinTransaction()"><code>EntityManager.joinTransaction()</code></a> method.</div>
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<dt><span class="simpleTagLabel">Since:</span></dt>
<dd>2.1</dd>
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