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<td class="page-title-pattern-first-line " style="padding: 0px; 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-4144" style="color: #3b73af; text-decoration: none"><img src="https://hibernate.atlassian.net/images/icons/issuetypes/bug.png" height="16" width="16" border="0" align="absmiddle" alt="Bug" style="vertical-align: text-bottom" /></a> <a href="https://hibernate.atlassian.net/browse/HHH-4144" style="color: #3b73af; text-decoration: none">HHH-4144</a>
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<td style="vertical-align: top;; padding: 0px; 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-4144" style="color: #3b73af; text-decoration: none">ConcurrentModificationException when initializing unrelated EntityManagerFactories in two different threads</a> </span>
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Change By:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <a class="user-hover" rel="brmeyer" id="email_brmeyer" href="https://hibernate.atlassian.net/secure/ViewProfile.jspa?name=brmeyer" style="color:#6c797f;; color: #3b73af; text-decoration: none">Brett Meyer</a>
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Comment:
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<td style="padding: 0px; border-collapse: collapse; font: normal 14px/20px Arial, sans-serif; padding: 2px 0 2px 5px; vertical-align: top"> <span class="diffremovedchars" style="background-color:#ffe7e7;text-decoration:line-through;">Okay, somehow I pressed enter before typing the rest of the issue. Rest of the description here,..<br /><br />When I create two EntityManagerFactories in two different threads, I get the stacktrace below. It looks like I'm determining the persistence provider implementations twice at the same time; the static set in the Persistence class is not thread safe; in particular findAllProviders() fails if it is called concurrently. In this case, the use of the persistence api in the two different threads is completely unrelated--they are using different persistence units, different dbs, etc. This seems like a use case that should be supported?<br /><br />[java] java.util.ConcurrentModificationException<br /> [java] at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793)<br /> [java] at java.util.HashMap$KeyIterator.next(HashMap.java:828)<br /> [java] at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:51)<br /> [java] at com.darkcorner.minotaur.sa.redline.RedlineDatabaseControl.ensureRunning(RedlineDatabaseControl.java:101)<br /> [java] at com.darkcorner.minotaur.sa.redline.RedlineService.restartService(RedlineService.java:316)<br /> [java] at com.darkcorner.harmonice.ServiceHandler.callRestart(ServiceHandler.java:241)<br /> [java] at com.darkcorner.harmonice.ServiceHandler.access$000(ServiceHandler.java:56)<br /> [java] at com.darkcorner.harmonice.ServiceHandler$RestartTask.run(ServiceHandler.java:63)<br /> [java] at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)<br /> [java] at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)<br /> [java] at java.util.concurrent.FutureTask.run(FutureTask.java:138)<br /> [java] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:98)<br /> [java] at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:207)<br /> [java] at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)<br /> [java] at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)<br /> [java] at java.lang.Thread.run(Thread.java:619)<br /></span>
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