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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0; border-collapse: collapse; padding: 0 0 10px"> <p style="margin: 10px 0 0; margin-top: 0">After reviewing your test case, the first thing which stood out to me was how you handled closing the <tt>EntityManager</tt>. Your code does this:</p>
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<span class="code-keyword" style="color: #000091">finally</span> {
entityManager.close();
}
</pre>
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</div> <p style="margin: 10px 0 0">One could argue that potentially the <tt>EntityManager</tt> was never constructed or opened in the try-block for some reason. <br> With that in mind, I would say a better finally-block would be this:</p>
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<span class="code-keyword" style="color: #000091">finally</span> {
<span class="code-keyword" style="color: #000091">if</span> ( entityManager != <span class="code-keyword" style="color: #000091">null</span> && entityManager.isOpen() ) {
entityManager.close();
}
}
</pre>
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</div> <p style="margin: 10px 0 0">This has a positive impact on your situation because it guarantees that the <tt>AfterTransactionCompletion</tt> callbacks fire, thus avoiding the memory leak you describe and illustrate in your test case. The reason is because the <tt>#isOpen()</tt> method performs some transaction management checks that notice that the callbacks were delayed by the reaper thread and must execute on the original calling thread. Its this call which effectively forces them to fire thus clearing the AuditProcess queue for you.</p> <p style="margin: 10px 0 0">With that said, this will throw a HibernateException because the underlying <tt>SynchronizationCallbackCoordinatorTrackingImpl#processAnyDelayedAfterCompletion</tt> will be called and presently informs the original calling thread of the following after executing the <tt>AfterTransactionCompletion</tt> callbacks.</p>
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<span class="code-keyword" style="color: #000091">throw</span> <span class="code-keyword" style="color: #000091">new</span> HibernateException( <span class="code-quote" style="color: #009100">"Transaction was rolled back in a different thread!"</span> );
</pre>
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</div> <p style="margin: 10px 0 0">What you could then do is handle that exception yourself if you anticipate it so it doesn't present an issue as follows:</p>
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<span class="code-keyword" style="color: #000091">finally</span> {
<span class="code-keyword" style="color: #000091">try</span> {
<span class="code-keyword" style="color: #000091">if</span> ( entityManager != <span class="code-keyword" style="color: #000091">null</span> && entityManager.isOpen() ) {
entityManager.close();
}
}
<span class="code-keyword" style="color: #000091">catch</span> ( PersistenceException e ) {
<span class="code-comment" style="color: #808080">// to be expected, ignore it
</span> }
}
</pre>
</div>
</div> <p style="margin: 10px 0 0">I could discuss this with the team to see if there are any concerns with us adding the same type of transaction management checks from <tt>#isOpen()</tt> to <tt>#close()</tt>. If there is no issue, that would atleast allow those after-completion callbacks to fire to avoid the memory leak you described. But that will still imply a change in your finally block to handle the <tt>PersistenceException</tt> for your use case.</p> </td>
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