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From Norman Maurer <nor...@apache.org>
Subject Re: Fw: Re: Jackrabbit error
Date Thu, 12 Aug 2010 17:02:23 GMT
You should not share a JCR Session (even not for read). Create one per
request/thread. Session creation is cheap and will get sure you don't
get into trouble.

Bye,
Norman


2010/8/12 Vishwanath Dubey <vndube@gmail.com>:
> Zukka, thanks for your response...
>
>
> The repository is not accessed from more than one app for as of now,
> currently the repository creation  is a singleton behavior and it is in the
> same JVM where web app is running.
>
> I could only see that since my app is a web 2.0 based web app (used GWT with
> Seam), the repository session is being injected for every ajax call (here I
> used EVENT scope for injecting the session) , and since some time it might
> be parallel call the repository session injection will also be in parallel.
> If there is any synchronization happening inside Jackrabbit (Jackrabbit
> code) for creating the session, it might be causing this error.
>
> That is why I expect concurrent read only JCR session which can be shared
> across many request. I can created write JCR session only when I need to
> write something to the repository...
>
> Let me know your thoughts
>
> Thanks & Regards,
>
> Vish
>
>
> --- On *Tue, 10/8/10, Jukka Zitting <jukka.zitting@gmail.com>* wrote:
>
>
> From: Jukka Zitting <jukka.zitting@gmail.com>
> Subject: Re: Jackrabbit error
> To: "Vishwanath Dubey" <vndube@yahoo.com>
> Date: Tuesday, 10 August, 2010, 4:35 PM
>
> Hi,
>
> On Mon, Aug 9, 2010 at 5:48 PM, Vishwanath Dubey
> <vndube@yahoo.com<http://mc/compose?to=vndube@yahoo.com>>
> wrote:
>> I do not know if you can answer it or let me know the site where I can
> post the folllowing.
>
> The best forum for Jackrabbit-related questions is the
> users@jackrabbit.apache.org<http://mc/compose?to=users@jackrabbit.apache.org>mailing
> list. See
> http://jackrabbit.apache.org/mailing-lists.html for details on how to
> use the list.
>
>> We are currently using Jackrabbit 2.1 for our project. The following error
> appears very
>> often and in turn we only get option to restart the server, which is
> giving serious attention.
>>
>> Caused by: com.mmpnc.icm.repository.common.JCRException:
> javax.jcr.RepositoryException:
>> The repository home /oradata/jboss/jboss-4.2.3.GA/common appears to be
> already
>> locked by the current process.
>
> As the exception says, you're trying to start the repository when it's
> already running within the same JVM. Do you have another webapp that's
> also accessing the same repository? The best approach for such cases
> is to have both webapps using the same Repository instance instead of
> trying to start separate instances that access the same underlying
> repository directory.
>
>> Also let me me know whether following fixes in 2.2 will resolve it
>> (concurrent access to JCR session)
>> https://issues.apache.org/jira/browse/JCR-890
>
> I'm just about to resolve it as fixed. See the issue for more details.
>
>> If yes,  when 2.2 will be globally available or else how we can move
> forward.
>
> At current pace I believe Jackrabbit 2.2 will be officially released
> sometime within the next two months.
>
> BR,
>
> Jukka Zitting
>

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