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<h4>close</h4>
<pre class="methodSignature">void&nbsp;close()</pre>
<div class="block">Close the factory, releasing any resources that it holds.
 After a factory instance has been closed, all methods invoked
 on it will throw the <code>IllegalStateException</code>, except
 for <code>isOpen</code>, which will return false. Once an
 <code>EntityManagerFactory</code> has been closed, all its
 entity managers are considered to be in the closed state.</div>
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