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https://issues.apache.org/jira/browse/OPENJPA-2042?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jeremy Bauer closed OPENJPA-2042.
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Resolution: Fixed
> Diagnostics for Application Managed EntityManagerFactory leaks.
> ---------------------------------------------------------------
>
> Key: OPENJPA-2042
> URL: https://issues.apache.org/jira/browse/OPENJPA-2042
> Project: OpenJPA
> Issue Type: Improvement
> Affects Versions: 1.0.4, 1.2.2, 2.0.1, 2.1.0
> Reporter: Jacob Nowosatka
> Assignee: Rick Curtis
> Priority: Minor
> Fix For: 1.2.3, 2.2.0
>
> Attachments: OPENJPA-2042.patch, TestEMFMemoryLeak.java
>
>
> EntityManagerFactories can be leaked if they are created with the JSE
> bootstrap Persistence class and are never closed, causing an
> OutOfMemoryException.
> One possibility may be to log a warning or otherwise alert the developer when
> the number of unclosed EMF's reaches a certain threshold. An extra step could
> be taken here to track where the EMF's are being opened and which ones aren't
> being closed as to show the developer exactly where in the code the problem
> is occurring.
> There may be a possibility to eliminate this leak by making the references to
> the EMF's weak and let the garbage collector clean up the unclosed EMF's.
> However, in the case that other objects are being leaked as well, this change
> may make it harder to detect such leaks.
> I ran a simple test that creates a EMF from Persistence. It then creates and
> closes an EntityManger. A new EMF is then created without closing the old
> one, effectively "leaking" it. As expected, this results in an
> OutOfMemoryException. When using weak references on the EMF's, I was able to
> get the test to run all night without a trace of any heap growth. However,
> this is only a very simple test and a test with more
> Entities/Configurations/etc. may result in heap growth due to other objects
> being leaked(as mentioned earlier). My test case is attached.
> For comparison, I tried the same test on Hibernate and EclipseLink. Hibernate
> runs into the same OutOfMemoryException. EclipseLink does not.
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