So, that concludes
I may expect such request time outs in GAE any time without being able to
fix it?
Thankx and Regards
Vik
Founder
www.sakshum.com
www.sakshum.blogspot.com
On Fri, Sep 18, 2009 at 12:56 AM, Toby Reyelts <to...@google.com> wrote:
> Yes, it's quite trivial for two different http requests to land on two
> different application instances. You can see if it's an initializing request
> for an application instance by logging from an appropriate servlet's init()
> method (for example, one that is in the path of the request or is registered
> as load-on-startup).
>
>
> On Thu, Sep 17, 2009 at 2:20 PM, Vik <vik....@gmail.com> wrote:
>
>> Hie
>> you guys put me in doubt then.
>> I opened the browser and logged in to my app which created a request to
>> pull authentication info. and once i logged in i queried a page and this was
>> another request.
>>
>> In this process i got the two different UserClassLoader. So, does your
>> statement holds good?
>>
>>
>> Thankx and Regards
>>
>> Vik
>> Founder
>> www.sakshum.com
>> www.sakshum.blogspot.com
>>
>>
>> On Thu, Sep 17, 2009 at 11:19 PM, Toby Reyelts <to...@google.com> wrote:
>>
>>> Just to clarify what Jason is saying, the fact that you're seeing two
>>> different UserClassLoader instances in those two requests:
>>>
>>> userclassloa...@1f7cdc7 and
>>> userclassloa...@1e6f0ef
>>>
>>> means that you're actually looking at two requests for two different
>>> isolated application instances, with each one undergoing its own
>>> initialization.
>>>
>>> On Thu, Sep 17, 2009 at 1:19 PM, Jason (Google) <apija...@google.com>wrote:
>>>
>>>> Hi Vik. At most a single UserClassLoader is loaded per application
>>>> instance. Since you're seeing two output lines in your logs, these two
>>>> requests must have hit separate running instances of your application.
>>>>
>>>> In your benchmarking, you need to account for this initialization, i.e.
>>>> ignoring requests that are loading requests per application instance, and
>>>> keep in mind that you're likely to see several loading requests every time
>>>> you upload a change to your application, as new instances are spun up.
>>>>
>>>> - Jason
>>>>
>>>>
>>>> On Thu, Sep 17, 2009 at 8:33 AM, Vik <vik....@gmail.com> wrote:
>>>>
>>>>> hie
>>>>> in two different requests.
>>>>>
>>>>> Thankx and Regards
>>>>>
>>>>> Vik
>>>>> Founder
>>>>> www.sakshum.com
>>>>> www.sakshum.blogspot.com
>>>>>
>>>>>
>>>>> On Thu, Sep 17, 2009 at 8:16 PM, Don Schwarz <schwa...@google.com>wrote:
>>>>>
>>>>>> To be clear, you're getting these two log statements in the same
>>>>>> request? Or subsequent requests?
>>>>>>
>>>>>>
>>>>>> On Thu, Sep 17, 2009 at 1:48 AM, Vik <vik....@gmail.com> wrote:
>>>>>>
>>>>>>> hie
>>>>>>> any updates on this please?
>>>>>>>
>>>>>>> yeah I did what you suggested by putting a log statement..
>>>>>>>
>>>>>>> and what I get are two different values from this block
>>>>>>>
>>>>>>> At first time of app startup
>>>>>>> vik.sakshum.sakshumweb.jsp.model.jdo.PMF <clinit>: Loading PMF in
>>>>>>> com.google.apphosting.runtime.security.userclassloa...@1f7cdc7
>>>>>>>
>>>>>>> and in another flow
>>>>>>> vik.sakshum.sakshumweb.jsp.model.jdo.PMF <clinit>: Loading PMF in
>>>>>>> com.google.apphosting.runtime.security.userclassloa...@1e6f0ef
>>>>>>>
>>>>>>>
>>>>>>> So, it means it is trying to load it in two different class loaders.
>>>>>>> So, how should I fix it?
>>>>>>>
>>>>>>> Thankx and Regards
>>>>>>>
>>>>>>> Vik
>>>>>>> Founder
>>>>>>> www.sakshum.com
>>>>>>> www.sakshum.blogspot.com
>>>>>>>
>>>>>>>
>>>>>>> On Thu, Sep 3, 2009 at 9:01 PM, Vik <vik....@gmail.com> wrote:
>>>>>>>
>>>>>>>> Hie
>>>>>>>> Thankx for taking time...
>>>>>>>>
>>>>>>>> I just adding the static block u mentioned in point 1 just after the
>>>>>>>> static block i have (in the above mail)
>>>>>>>>
>>>>>>>> I am sorry I did not get your point 2.
>>>>>>>> Right now what I do is: every time a request goes to a particular
>>>>>>>> servlet depending upon application flow and i call
>>>>>>>> PersistentManager pm = PMF.get().getPersistenceManager();
>>>>>>>>
>>>>>>>> and then do jdo stuff with GAE.
>>>>>>>>
>>>>>>>> So, i m not checking any kind of duplicate or anything. I was hoping
>>>>>>>> the PMF class getInstance which is implemented as a singleton pattern
>>>>>>>> takes care of all.
>>>>>>>>
>>>>>>>> Please guide.. my app right now sucks coz of this not intialized
>>>>>>>> error for PMF.
>>>>>>>>
>>>>>>>>
>>>>>>>> Thankx and Regards
>>>>>>>>
>>>>>>>> Vik
>>>>>>>> Founder
>>>>>>>> www.sakshum.com
>>>>>>>> www.sakshum.blogspot.com
>>>>>>>>
>>>>>>>>
>>>>>>>> On Wed, Sep 2, 2009 at 8:42 PM, Toby Reyelts <to...@google.com>wrote:
>>>>>>>>
>>>>>>>>> Thanks for the code. I have three suggestions (mostly from my
>>>>>>>>> previous post):
>>>>>>>>> 1) Are you maybe loading that singleton class in different
>>>>>>>>> classloaders? Try logging the classloader object reference that tries
>>>>>>>>> to
>>>>>>>>> create the PersistenceManagerFactory. You can add a static
>>>>>>>>> initializer ABOVE
>>>>>>>>> pmfInstance.
>>>>>>>>>
>>>>>>>>> static {
>>>>>>>>> logger.log(Level.SEVERE, "Loading PMF in " +
>>>>>>>>> PMF.class.getClassLoader()");
>>>>>>>>> }
>>>>>>>>>
>>>>>>>>> 2) Patch the datanucleus plugin code that makes the check for
>>>>>>>>> duplicate PMF creations to log a stacktrace first thing every time
>>>>>>>>> it's
>>>>>>>>> called. Then you'll know for sure which code paths are causing this to
>>>>>>>>> happen.
>>>>>>>>>
>>>>>>>>> 3) Disable the check if you're sure you're only creating the PMF a
>>>>>>>>> small number of times.
>>>>>>>>>
>>>>>>>>> On Wed, Sep 2, 2009 at 2:45 AM, Vik <vik....@gmail.com> wrote:
>>>>>>>>>
>>>>>>>>>> Hie
>>>>>>>>>> here is the code I am using:
>>>>>>>>>> package vik.sakshum.sakshumweb.jsp.model.jdo;
>>>>>>>>>>
>>>>>>>>>> import javax.jdo.JDOHelper;
>>>>>>>>>> import javax.jdo.PersistenceManagerFactory;
>>>>>>>>>>
>>>>>>>>>> import org.compass.core.Compass;
>>>>>>>>>> import org.compass.core.config.CompassConfiguration;
>>>>>>>>>> import org.compass.core.config.CompassEnvironment;
>>>>>>>>>> import org.compass.gps.CompassGps;
>>>>>>>>>> import org.compass.gps.device.jdo.Jdo2GpsDevice;
>>>>>>>>>> import org.compass.gps.impl.SingleCompassGps;
>>>>>>>>>>
>>>>>>>>>> public final class PMF {
>>>>>>>>>> private static final PersistenceManagerFactory pmfInstance =
>>>>>>>>>>
>>>>>>>>>> JDOHelper.getPersistenceManagerFactory("transactions-optional");
>>>>>>>>>>
>>>>>>>>>> private static final Compass compass;
>>>>>>>>>> private static final CompassGps compassGps;
>>>>>>>>>>
>>>>>>>>>> static {
>>>>>>>>>> compass = new
>>>>>>>>>> CompassConfiguration().setConnection("gae://index")
>>>>>>>>>>
>>>>>>>>>> .setSetting(CompassEnvironment.ExecutorManager.EXECUTOR_MANAGER_TYPE,
>>>>>>>>>> "disabled")
>>>>>>>>>> .addScan("vik.sakshum.sakshumweb.jsp.model.jdo")
>>>>>>>>>> .buildCompass();
>>>>>>>>>>
>>>>>>>>>> compassGps = new SingleCompassGps(compass);
>>>>>>>>>> compassGps.addGpsDevice(new Jdo2GpsDevice("appenine",
>>>>>>>>>> pmfInstance));
>>>>>>>>>> compassGps.start();
>>>>>>>>>>
>>>>>>>>>> compassGps.index();
>>>>>>>>>>
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> private PMF() {}
>>>>>>>>>>
>>>>>>>>>> public static PersistenceManagerFactory get() {
>>>>>>>>>> return pmfInstance;
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> public static Compass getCompass(){
>>>>>>>>>> return compass;
>>>>>>>>>> }
>>>>>>>>>> }
>>>>>>>>>>
>>>>>>>>>> any clues?
>>>>>>>>>>
>>>>>>>>>> Thankx and Regards
>>>>>>>>>>
>>>>>>>>>> Vik
>>>>>>>>>> Founder
>>>>>>>>>> www.sakshum.com
>>>>>>>>>> www.sakshum.blogspot.com
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Wed, Sep 2, 2009 at 12:34 AM, Toby Reyelts
>>>>>>>>>> <to...@google.com>wrote:
>>>>>>>>>>
>>>>>>>>>>> Vik,
>>>>>>>>>>>
>>>>>>>>>>> Do you have some sample code to reproduce this? By default, we
>>>>>>>>>>> throw an exception if you try to create more than one
>>>>>>>>>>> PersistenceManagerFactory. Are you using a singleton class to
>>>>>>>>>>> prevent more
>>>>>>>>>>> than one from being created? If so, are you maybe loading that
>>>>>>>>>>> singleton
>>>>>>>>>>> class in different classloaders? (Try logging the classloader object
>>>>>>>>>>> reference that tries to create the PersistenceManagerFactory).
>>>>>>>>>>>
>>>>>>>>>>> Lastly, you can disable the exception if you want (details should
>>>>>>>>>>> be in the exception message), but it will be a performance problem
>>>>>>>>>>> for you
>>>>>>>>>>> if you're creating more than a few PersistenceManagerFactory's.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Tue, Sep 1, 2009 at 1:51 PM, Vik <vik....@gmail.com> wrote:
>>>>>>>>>>>
>>>>>>>>>>>> anyone any updates on this please?
>>>>>>>>>>>> Thankx and Regards
>>>>>>>>>>>>
>>>>>>>>>>>> Vik
>>>>>>>>>>>> Founder
>>>>>>>>>>>> www.sakshum.com
>>>>>>>>>>>> www.sakshum.blogspot.com
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>> On Sun, Aug 30, 2009 at 8:51 PM, Vik <vik....@gmail.com> wrote:
>>>>>>>>>>>>
>>>>>>>>>>>>> Hie
>>>>>>>>>>>>> Any one using compass on his GAE app?
>>>>>>>>>>>>>
>>>>>>>>>>>>> I am frequently getting error cannot initialize PMF where there
>>>>>>>>>>>>> is static code to initialize compass apis.
>>>>>>>>>>>>> Any idea how to resolve?
>>>>>>>>>>>>>
>>>>>>>>>>>>> Thankx and Regards
>>>>>>>>>>>>>
>>>>>>>>>>>>> Vik
>>>>>>>>>>>>> Founder
>>>>>>>>>>>>> www.sakshum.com
>>>>>>>>>>>>> www.sakshum.blogspot.com
>>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
>>>>
>>>
>>>
>>>
>>
>>
>>
>
> >
>
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