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<td class="page-title-pattern-first-line " style="padding: 0; border-collapse: collapse; font-family: Arial, sans-serif; font-size: 14px; padding-top: 10px"> <a href="https://hibernate.atlassian.net/browse/HHH" style="color: #3b73af; text-decoration: none">Hibernate ORM</a> / <a href="https://hibernate.atlassian.net/browse/HHH-12281" style="color: #3b73af; text-decoration: none"><img src="cid:jira-generated-image-avatar-d8ac56fb-cf4a-4dbd-8117-c5c18e15445f" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom"></a> <a href="https://hibernate.atlassian.net/browse/HHH-12281" style="color: #3b73af; text-decoration: none">HHH-12281</a> </td>
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<td style="vertical-align: top;; padding: 0; border-collapse: collapse; padding-right: 5px; font-size: 20px; line-height: 30px; mso-line-height-rule: exactly" class="page-title-pattern-header-container"> <span class="page-title-pattern-header" style="font-family: Arial, sans-serif; padding: 0; font-size: 20px; line-height: 30px; mso-text-raise: 2px; mso-line-height-rule: exactly; vertical-align: middle"> <a href="https://hibernate.atlassian.net/browse/HHH-12281" style="color: #3b73af; text-decoration: none">SELECT - FOR UPDATE NOWAIT hangs if lock cannot be acquired</a> </span> </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 4.3.11 </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> 09/Feb/2018 10:30 AM </td>
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<td style="padding: 0; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="tadhg.pearson" id="email_tadhg.pearson" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=tadhg.pearson" style="color:#6c797f;; color: #3b73af; text-decoration: none">Tadhg Pearson</a> </td>
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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-top:0;margin-bottom:10px;; margin: 10px 0 0; margin-top: 0">When using `find` to SELECT - FOR UPDATE NOWAIT, no exception is ever returned to the blocked thread, and it hangs.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">The original test was in Spring Data JPA (see <a href="https://jira.spring.io/browse/DATAJPA-1259):" class="external-link" rel="nofollow" style="color: #3b73af; text-decoration: none">https://jira.spring.io/browse/DATAJPA-1259):</a> I've tried my best to paraphase the test into straight Hibernate, but I don't have access to the tools here so there might be some bugs.</p>
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<pre class="code-java" style="margin: 10px 0 0; margin-top: 0; max-height: 30em; overflow: auto; white-space: pre-wrap; word-wrap: normal">
entityManager.find(ActivationLock.class, key, LockModeType.PESSIMISTIC_WRITE, Collections.singletonMap(<span class="code-quote" style="color: #009100">"javax.persistence.lock.timeout"</span>, 0));
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">where the full test is</p>
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@Entity
@Table(name = <span class="code-quote" style="color: #009100">"CONF_ACTIVATION_LOCK"</span>)
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>ActivationLock {
@EmbeddedId
ActivationLockKey key;
... Getters, setters, equals
}
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@Embeddable
<span class="code-keyword" style="color: #000091">public</span> <span class="code-keyword" style="color: #000091">class </span>ActivationLockKey <span class="code-keyword" style="color: #000091">implements</span> Serializable {
<span class="code-keyword" style="color: #000091">private</span> <span class="code-object" style="color: #910091">Long</span> configId;
@Convert(converter = NetworkConverter.class) <span class="code-comment" style="color: #808080">// Writes only the first <span class="code-object" style="color: #910091; color: #808080">char</span> of the string
</span> <span class="code-keyword" style="color: #000091">private</span> NetworkEnum network
... Getters, setters, equals...
}
</pre>
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</div> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">@Component // Config is on the abstract test, enables transaction management and scans this package for components<br> public class ActivationLockTest extends AbstractOracleDrivenUnitTests {</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @PersistenceContext EntityManager underTest;</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Test<br> public void testFindAll() throws Exception {<br> ActivationLockKey key = new ActivationLockKey(42L, NetworkEnum.PRODUCTION);<br> ActivationLock requested = new ActivationLock(key);<br> if(!underTest.exists(key))</p> { initRow(requested); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> AtomicBoolean ready = new AtomicBoolean(false);<br> AtomicBoolean contended = new AtomicBoolean(false);<br> AtomicBoolean done = new AtomicBoolean(false);</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> new Thread(() -> lockRows(requested, ready, contended, done)).start();<br> new Thread(() -> contendRows(requested, ready, contended)).start();</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> Awaitility.await().atMost(20, TimeUnit.SECONDS).until(done::get);<br> }</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Transactional<br> public void initRow(ActivationLock requested) </p> { ActivationLock created = underTest.persist(requested.getKey()); assertEquals(created, requested); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Transactional<br> public void contendRows(ActivationLock requested, AtomicBoolean ready, AtomicBoolean contended) {<br> Awaitility.await().until(ready::get);<br> try </p> { List<ActivationLock> lockedRows = underTest.find(ActivationLock.class, requested.getKey(), LockModeType.PESSIMISTIC_WRITE, Collections.singletonMap("javax.persistence.lock.timeout", 0)); //This thread gets stuck here //Should have thrown an exception by now assertNull(lockedRows); // Did we just get null instead of an exception? fail(); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> catch (Exception e)</p> { System.out.println("Failed"); //Good! What did we get? e.printStackTrace(); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> contended.set(true);<br> }</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0"> @Transactional<br> public void lockRows(ActivationLock requested, AtomicBoolean ready, AtomicBoolean contended, AtomicBoolean done) </p> { List<ActivationLock> lockedRows = underTest.find(ActivationLock.class, requested.getKey(), LockModeType.PESSIMISTIC_WRITE, Collections.singletonMap("javax.persistence.lock.timeout", 0)); assertEquals(lockedRows.get(0), requested); ready.set(true); Awaitility.await().until(contended::get); //This thread waits forever here done.set(true); } <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">}<br> The code issues the SQL I would expect, I see this SQL twice in the logs</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Hibernate: <br> select<br> CONFIG_ID <br> from<br> CONF_ACTIVATION_LOCK <br> where<br> CONFIG_ID =? <br> and NETWORK =? for update<br> nowait</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">I would except some kind of exception, but in fact we just deadlock where I marked, and Awaitility kills the test after the timeout.</p> <p style="margin-top:0;margin-bottom:10px;; margin: 10px 0 0">Please let me know if you need more details!</p> </td>
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