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Re: [jetty-users] java.lang.OutOfMemoryError: PermGen space
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Moving the postgres driver out of the .war file seems to have fixed my problem. I think that is a good change anyhow.
It was only really added to the .war because it was convenient at the time.
I hadn't noticed the DriverManagerLeakPreventer when I first looked through the list (probably because at that time I
didn't realize that it was the problem). I assume it would solve the problem as well.
Mattias' preventer looks interesting too, I've added it to my list of things to try out. Thanks.
-Andrew
On 14-04-30 01:40 PM, Hal Deadman wrote:
> I think this (https://github.com/mjiderhamn/classloader-leak-prevention) is the most comprehensive (and application
> server independent) listener for preventing classloader memory leaks.
> I agree that not packaging the database driver with the web app is a good idea although the listener should clean up
> that particular leak.
>
> The classloader-leak-prevention listener's author also has a good series discussing classloader leaks (why they happen
> and how to track them down) on his blog: http://java.jiderhamn.se/
>
>
>
> On Wed, Apr 30, 2014 at 1:21 PM, Joakim Erdfelt <joakim@xxxxxxxxxxx <mailto:joakim@xxxxxxxxxxx>> wrote:
>
> Could the DriverManagerLeakPreventer help?
> https://github.com/eclipse/jetty.project/blob/master/jetty-util/src/main/java/org/eclipse/jetty/util/preventers/DriverManagerLeakPreventer.java
>
> It will pin the DriverManager at the server side classloader.
>
>
> --
> Joakim Erdfelt <joakim@xxxxxxxxxxx <mailto:joakim@xxxxxxxxxxx>>
> webtide.com <http://www.webtide.com/> - intalio.com/jetty <http://intalio.com/jetty>
> Expert advice, services and support from from the Jetty & CometD experts
> eclipse.org/jetty <http://eclipse.org/jetty/> - cometd.org <http://cometd.org/>
>
>
> On Wed, Apr 30, 2014 at 9:31 AM, Andrew Eidsness <eclipse@xxxxxxxxxx <mailto:eclipse@xxxxxxxxxx>> wrote:
>
> Jetty is deployed on my server and is running as a stand-alone daemon. I'm deploying the war by copying into the
> webapps folder.
>
> Following the class loader references I think the problem is that java.sql.DriverManager.registeredDrivers is
> keeping an
> instance of my org.postgresql.Driver from each deployed instance. The registeredDrivers member is an ArrayList
> of with
> 8 instances of java.sql.DriverInfo each holding an instance of org.postgresql.Driver. DriverManager was loaded
> by the
> system class loader but the postgres Driver was loaded by the webapp's loader.
>
> I think the fix is to stop deploying my postgres connector as part of the webapp. I don't have a real reason for
> deploying it that way, it was just for convenience when I was setting up the project. I'll copy it into my jetty
> deployment instead and see what happens.
>
> Thanks for your help. My main problem here is not being confident in how I've setup things. I've used Google
> to find
> documentation for small parts of various versions. However, I think I'm making progress now.
>
> -Andrew
>
> On 14-04-30 11:48 AM, Jan Bartel wrote:
> > Andrew,
> >
> > How are you running jetty? In a standalone distro, as the maven
> > plugin, or via embedded code? I take it that the webapp is being
> > unpacked to a tmp directory?
> >
> > It does sound as if the WebAppClassloader is being pinned. There
> > should be a way with the heap dump tool to follow back to the objects
> > that are keeping references to the WebAppClassLoaders, or follow the
> > link from the doc page to the blog entry about classloader pinning,
> > which describes how to use JVisualVM to hunt down the references.
> >
> > Jan
> >
> >
> >
> > On 1 May 2014 01:11, Andrew Eidsness <eclipse@xxxxxxxxxx <mailto:eclipse@xxxxxxxxxx>> wrote:
> >> My jetty server (9.1.4.v20140401) eventually runs out of memory after I’ve
> >> deployed the same war (during development) to the webapps folder. After
> >> looking in the bugs database I think this might be happening because I’m
> >> deploying jars inside the war’s lib folder.
> >>
> >> The reason I think this is that looking at the heap dump (in MAT) I can see
> >> 8 copies of classes from those bundled jars. Each of the instances was
> >> loaded by a different instance of
> >> org.eclipse.jetty.webapp.WebAppClassLoader.
> >>
> >> My theory is that when the war is redeployed a new instance of
> >> WebAppClassLoader is created which then loads the new jar files.
> >>
> >> I think I’m doing something wrong, but haven’t been able to figure out what.
> >> I’m not sure how to get the old class loader’s to go away.
> >>
> >> I’ve tried using the leak preventer
> >> (http://www.eclipse.org/jetty/documentation/current/preventing-memory-leaks.html)
> >> by putting this into my jetty.xml file:
> >>
> >> <Call name="addBean">
> >> <Arg>
> >> <New
> >> class="org.eclipse.jetty.util.preventers.AppContextLeakPreventer"/>
> >> </Arg>
> >> </Call>
> >>
> >> But it didn’t seem to make a difference.
> >>
> >> Any ideas or pointers to appropriate documentation?
> >>
> >> Thanks,
> >> -Andrew
> >>
> >>
> >> _______________________________________________
> >> jetty-users mailing list
> >> jetty-users@xxxxxxxxxxx <mailto:jetty-users@xxxxxxxxxxx>
> >> https://dev.eclipse.org/mailman/listinfo/jetty-users
> >>
> >
> >
> >
>
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