was there ever a resolution to this. i'm encountering this problem a lot.
-mike
On Jul 15, 2011, at 1:56 PM, Ricardo J. Parada wrote:
> Try the second one I sent out... That one is simpler and easier to understand.
>
> Thanks
>
>
>
>
> On Jul 15, 2011, at 1:52 PM, Chuck Hill wrote:
>
>> I will try it later.
>>
>>
>> On 2011-07-15, at 7:11 AM, Ricardo J. Parada wrote:
>>
>>>
>>> I have some good news. I have a little test app with a simple Main
>>> component that reproduces the problem in 5 easy steps.
>>>
>>> Who is interested in trying it out? :-) You just import into Eclipse and
>>> follow the 5 easy steps on the Main component.
>>>
>>> <PageCacheTest.zip>
>>>
>>>
>>>
>>>
>>>
>>> On Jul 14, 2011, at 1:09 PM, Chuck Hill wrote:
>>>
>>>> I have, sort of, understood this code in the past. It is tricky, you
>>>> really have to pay attention. IIRC what it has is a two level cache for
>>>> (potentially) every page in the regular cache.
>>>>
>>>>
>>>> Chuck
>>>>
>>>>
>>>> On 2011-07-14, at 9:39 AM, Ricardo J. Parada wrote:
>>>>
>>>>>
>>>>>
>>>>> Oh... for reference that code in ERXAjaxSession.java looks like this:
>>>>>
>>>>> public void savePage(WOComponent page) {
>>>>> ...
>>>>>
>>>>> // Remove the oldest entry if we're about to add a new one and that
>>>>> would put us over the cache size ...
>>>>> // We do a CACHE_SIZE*2 here because for every page, we have to
>>>>> potentially store its previous contextid to prevent
>>>>> // race conditions, so there technically can be 2x cache size many
>>>>> pages in the cache.
>>>>> boolean removedCacheEntry =
>>>>> cleanPageReplacementCacheIfNecessary(pageCacheKey);
>>>>> 208: if (!removedCacheEntry && pageReplacementCache.size() >=
>>>>> ERXAjaxSession.MAX_PAGE_REPLACEMENT_CACHE_SIZE * 2) {
>>>>> Iterator entryIterator = pageReplacementCache.entrySet().iterator();
>>>>> Map.Entry oldestEntry = (Map.Entry) entryIterator.next();
>>>>> entryIterator.remove();
>>>>> if (logger.isDebugEnabled()) logger.debug(pageCacheKey +
>>>>> "pageReplacementCache too large, removing oldest entry = " +
>>>>> ((TransactionRecord)oldestEntry.getValue()).key());
>>>>> }
>>>>>
>>>>> ...
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>> On Jul 14, 2011, at 12:33 PM, Ricardo J. Parada wrote:
>>>>>
>>>>>> I don't understand the code in ERXAjaxSession.java:208-213 very well but
>>>>>> I can see that the size of the page replacement cache referred to by
>>>>>> that code is growing with every AJAX request until it is >= two times
>>>>>> the size specified by er.extensions.maxPageReplacementCacheSize. From
>>>>>> there on it removes entries from there.
>>>>>>
>>>>>> At this point if I close the dialog (AMD) and then click on the link on
>>>>>> the page I get the "You backtracked too far" error.
>>>>>>
>>>>>> Anybody understands that code? :-)
>>>>>>
>>>>>> I'm gonna compare with my test Wonder app which all it has is the AMD
>>>>>> and link on the page to test this and try to find out why I don't get
>>>>>> the error there.
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>>>> On Jul 14, 2011, at 12:11 PM, Ricardo J. Parada wrote:
>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> I don't get the error if I set
>>>>>>> er.extensions.maxPageReplacementCacheSize=50 in my Properties.dev file.
>>>>>>>
>>>>>>> So now I'm focusing on ERXAjaxSession.java:208-213 to see if that code
>>>>>>> to try to figure out if that code has anything to do with the problem I
>>>>>>> have when I reduce the cache size.
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>>
>>>>>>> On Jul 13, 2011, at 10:36 PM, Alexis Tual wrote:
>>>>>>>
>>>>>>>> Hi,
>>>>>>>>
>>>>>>>> have you tried to raise the er.extensions.maxPageReplacementCacheSize
>>>>>>>> (default is 30) ? It should delay the page restauration error, not
>>>>>>>> fixing the real issue... and if you have few users and enough memory,
>>>>>>>> it might be the cheapest way to get it done.
>>>>>>>> Anyway, I filled a jira for this a year ago
>>>>>>>> http://issues.objectstyle.org/jira/browse/WONDER-545 (Don't try the
>>>>>>>> attached patch though, it's worse :))
>>>>>>>>
>>>>>>>> Still in Quebec, back to Poutine free area soon
>>>>>>>>
>>>>>>>> Alex
>>>>>>>>
>>>>>>>> Le 12 juil. 2011 à 19:29, Ricardo J. Parada a écrit :
>>>>>>>>
>>>>>>>>>
>>>>>>>>> On Jul 12, 2011, at 5:53 PM, Chuck Hill wrote:
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> On Jul 12, 2011, at 2:45 PM, Ricardo J. Parada wrote:
>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> On Jul 12, 2011, at 4:52 PM, Chuck Hill wrote:
>>>>>>>>>>>
>>>>>>>>>>>> Hi Ricardo,
>>>>>>>>>>>>
>>>>>>>>>>>> On Jul 12, 2011, at 1:35 PM, Ricardo J. Parada wrote:
>>>>>>>>>>>>>
>>>>>>>>>>>>> Does anybody have an idea what could be causing this problem?
>>>>>>>>>>>>> The user clicks on an AjaxModalDialogOpener which opens the
>>>>>>>>>>>>> dialog. Then the user does a whole bunch of stuff in the dialog
>>>>>>>>>>>>> that involves many clicks
>>>>>>>>>>>>
>>>>>>>>>>>> Does it still happen if they don't make so many clicks?
>>>>>>>>>>>
>>>>>>>>>>> If they make a few clicks then it works okay.
>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>>>> then finally clicks a DONE link to close the dialog.
>>>>>>>>>>>>
>>>>>>>>>>>> Are all of these links and clicks Ajax actions?
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> Yes, they are clicking on links generated by AjaxSubmitButton
>>>>>>>>>>> components to be exact. :-)
>>>>>>>>>>
>>>>>>>>>> And you are certain that there are no /wo/ or /wa/ requests mixed in
>>>>>>>>>> here?
>>>>>>>>>
>>>>>>>>> I set this property in my Properties.dev:
>>>>>>>>>
>>>>>>>>> log4j.logger.er.extensions.ERXApplication.RequestHandling=DEBUG
>>>>>>>>>
>>>>>>>>> and then I looked at all the uri's of the requests coming in. They
>>>>>>>>> have /ajax/ in there and when the dialog first comes up I see a few
>>>>>>>>> /_wr_/ and I guess the browser caches those since I don't see
>>>>>>>>> requests for those anymore on subsequent requests after the dialog is
>>>>>>>>> displayed.
>>>>>>>>>
>>>>>>>>> All the requests for the "many clicks" I mentioned have /ajax/ in
>>>>>>>>> them. I don't see any /wo/ requests mixed in.
>>>>>>>>>
>>>>>>>>> Also I set a breakpoint in ERXAjaxSession.java at the only place it
>>>>>>>>> calls super.savePage() where I assume the current page would be saved
>>>>>>>>> but I never hit the breakpoint. I would think that regular component
>>>>>>>>> requests would be generating new context IDs and therefore saving the
>>>>>>>>> page in the cache for those context IDs. But I don't see the page
>>>>>>>>> getting saved. :-/
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>>> The dialog has a closeUpdateContainerID bound with the id of an
>>>>>>>>>>>>> ajax update container to refresh, which it does refresh upon
>>>>>>>>>>>>> closing the dialog. But then the user clicks on a link on the
>>>>>>>>>>>>> page that is outside the refreshed AjaxUpdateContainer and the
>>>>>>>>>>>>> app displays the error "You backtracked too far. The application
>>>>>>>>>>>>> backtracking limit of 30 has been exceeded."
>>>>>>>>>>>>
>>>>>>>>>>>> Ajax links or regular component actions links? I do what seems to
>>>>>>>>>>>> be the same thing (except maybe the "does a whole bunch of stuff
>>>>>>>>>>>> in the dialog") and have not had any problems.
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> They are regular component action links. The context ID for which
>>>>>>>>>>> the page is being restored is 22.
>>>>>>>>>>
>>>>>>>>>> The original URL is 21?
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> Well, I just put in there a <wo:link string="test" action="$test"/>
>>>>>>>>> and by inspecting that link after I close the ajax modal dialog and
>>>>>>>>> the update container refreshes the href for the link is:
>>>>>>>>>
>>>>>>>>> http://192.168.1.9:53295/cgi-bin/WebObjects/Phynance.woa/wo/EmqPpwSYBiOiS7PPSLDXzw/8.0.0.9.1.1.13.1.5.1.2.1.1.3.51
>>>>>>>>>
>>>>>>>>> and clicking that generates the "You backtracked too far" error.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>>>> The key to tracking this down is to know if it is the Ajax or the
>>>>>>>>>>>> regular page cache that is missing the component.
>>>>>>>>>>>>
>>>>>>>>>>>
>>>>>>>>>>> I'm stepping through the restorePageForContextID() in
>>>>>>>>>>> ERXAjaxSession.java but I'm not sure what to look for.
>>>>>>>>>>
>>>>>>>>>>
>>>>>>>>>> Sorry, I just meant if the URL that caused the error was a /ajax/ or
>>>>>>>>>> /wo/ URL. It sounds like a /wo/ URL so that suggests to me that
>>>>>>>>>> something in your dialog is generating /wo/ or /wa/ requests that
>>>>>>>>>> are pushing the page out of the standard page cache.
>>>>>>>>>
>>>>>>>>> I did not see any /wo/ nor /wa/ requests. They are all /ajax/
>>>>>>>>> requests.
>>>>>>>>>
>>>>>>>>> Maybe I'll try to create a test Wonder app with an ajax modal dialog
>>>>>>>>> with a single ajax link in it that displays the current time when
>>>>>>>>> clicked... Then I can click it many many times. Then close the
>>>>>>>>> dialog and then click on a link on the page afterwards to see if I
>>>>>>>>> can reproduce.
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>
>>>>>>>>>> Chuck
>>>>>>>>>>
>>>>>>>>>> --
>>>>>>>>>> Chuck Hill Senior Consultant / VP Development
>>>>>>>>>>
>>>>>>>>>> Come to WOWODC this July for unparalleled WO learning opportunities
>>>>>>>>>> and real peer to peer problem solving! Network, socialize, and
>>>>>>>>>> enjoy a great cosmopolitan city. See you there!
>>>>>>>>>> http://www.wocommunity.org/wowodc11/
>>>>>>>>>>
>>>>>>>>>
>>>>>>>>> _______________________________________________
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>>>>>>>>>
>>>>>>>>> This email sent to [email protected]
>>>>>>>>
>>>>>>>
>>>>>>> _______________________________________________
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>>>>>>> This email sent to [email protected]
>>>>>>
>>>>>
>>>>
>>>> --
>>>> Chuck Hill Senior Consultant / VP Development
>>>>
>>>> Practical WebObjects - for developers who want to increase their overall
>>>> knowledge of WebObjects or who are trying to solve specific problems.
>>>> http://www.global-village.net/products/practical_webobjects
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>>
>>>
>>
>> --
>> Chuck Hill Senior Consultant / VP Development
>>
>> Practical WebObjects - for developers who want to increase their overall
>> knowledge of WebObjects or who are trying to solve specific problems.
>> http://www.global-village.net/products/practical_webobjects
>>
>>
>>
>>
>>
>>
>>
>
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