I think have some progress in this.
After upgrade to latest T5.2.0-SNAPSHOT resource links like
<link rel="stylesheet" type="text/css"
> href="/assets/anjlab/cubics/css/cube.css" />
>
not working anymore. So I desided to switch to Assets.
Now the same CSS referenced like this:
<link rel="stylesheet" type="text/css"
href="${asset:classpath:/anjlab/cubics/css/cube.css}" />
Note its located in another jar. To make this work I had to contribute to
ClasspathAssetAliasManager:
public static void
contributeClasspathAssetAliasManager(MappedConfiguration<String, String>
configuration)
{
configuration.add("cubics", "anjlab/cubics");
}
Other stylesheets located at my app referenced like this:
<link rel="stylesheet" type="text/css" href="${context:/css/all.css}" />
During rendering this link became:
http://ping-service.appspot.com/assets/1e85d3b227a83f96/ctx/css/all.css
Note this '1e85d3b227a83f96' hash. As I learned this is APPLICATION_VERSION,
which is by default:
configuration.add(SymbolConstants.APPLICATION_VERSION,
Long.toHexString(random.nextLong()));
So two different instances of applications will have different application
versions unless you contribute APPLICATION_VERSION in your AppModule (this
is what I had to do to avoid asset errors).
Now imagine that GAE hosts two instances of your app to handle requests. One
request retrieves HTML with links to CSS and JS files. Your browser will try
load these assets simultaneously and it may happen that second instance will
handle one of those requests, and since it have another value of
APPLICATION_VERSION you will get an error and browser couldn't load
response.
To fix it you should declare APPLICATION_VERSION explicitly in AppModule,
here is mine:
public static void contributeApplicationDefaults(
MappedConfiguration<String, String> configuration)
{
// ...
configuration.add(SymbolConstants.APPLICATION_VERSION, "beta");
}
Hope this help.
On Tue, Apr 13, 2010 at 21:13, Dmitry Gusev <dmitry.gu...@gmail.com> wrote:
> Alex,
>
> I don't have anything special in the app config, here is it:
>
> <?xml version="1.0" encoding="utf-8"?>
> <appengine-web-app xmlns="http://appengine.google.com/ns/1.0";>
> <application>ping-service</application>
> <version>beta</version>
> <sessions-enabled>true</sessions-enabled>
> <precompilation-enabled>true</precompilation-enabled>
>
> <!-- Configure java.util.logging -->
> <system-properties>
> <property name="java.util.logging.config.file"
> value="WEB-INF/logging.properties"/>
> </system-properties>
>
> <admin-console>
> <page name="Appstats" url="/appstats/" />
> </admin-console>
> </appengine-web-app>
>
> I'd also recommend you to set up appstats, you may find something
> interesting in there.
>
> As for request deadlines, I'm also having HardDeadlineExceededError, and
> this usually happens in two reasons:
> 1. New T5 instance starting up. According to logs it tooks about 20 seconds
> in average to startup (thats why your may to be unresponsive within in 10
> seconds for ping service).
>
> Such requests in logs starts like this:
>
>
> 1.
>
> 0.1.0.2 - - [13/Apr/2010:06:38:31 -0700] "GET
> /task/runjob;jsessionid=KpgsZ4bjrewWXHbiG4OlWg/?job=agxwaW5nLXNlcnZpY2VyGAsSCFNjaGVkdWxlGDwMCxIDSm9iGNEPDA
> HTTP/1.1" 500 8799
> "http://ping-service.appspot.com/cron/?schedule=every%205%20minutes";
> "AppEngine-Google; (+http://code.google.com/appengine)"
> "ping-service.appspot.com"
>
> 2. D 04-13 06:38AM 10.523
>
> org.apache.tapestry5.ioc.internal.ModuleImpl create: Creating service
> 'TimingFilter'.
>
> 3. D 04-13 06:38AM 10.543
>
> org.apache.tapestry5.ioc.internal.ModuleImpl create: Creating service
> 'Utf8Filter'.
>
>
> ...
>
> 04-13 06:38AM 29.877
>
> dmitrygusev.ping.services.JobExecutor execute: Error fetching url
> http://www.zadachite.com
> com.google.apphosting.api.DeadlineExceededException: This request
> (94c02a0647915c1e) started at 2010/04/13 13:38:01.337 UTC and was still
> executing at 2010/04/13 13:38:29.868 UTC.
>
>
> at java.lang.Object.wait(Native Method)
> at java.lang.Object.wait(Object.java:443)
> at java.util.concurrent.TimeUnit.timedWait(Unknown Source)
> at com.google.apphosting.runtime.AsyncFuture.get(AsyncFuture.java:60)
>
>
> at
> com.google.apphosting.runtime.ApiProxyImpl$AsyncApiFuture.get(ApiProxyImpl.java:319)
> at
> com.google.apphosting.runtime.ApiProxyImpl$AsyncApiFuture.get(ApiProxyImpl.java:210)
> at
> com.google.apphosting.runtime.ApiProxyImpl.doSyncCall(ApiProxyImpl.java:131)
>
>
> at
> com.google.apphosting.runtime.ApiProxyImpl.access$000(ApiProxyImpl.java:43)
> at
> com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:104)
> at
> com.google.apphosting.runtime.ApiProxyImpl$1.run(ApiProxyImpl.java:102)
>
>
> at java.security.AccessController.doPrivileged(Native Method)
> at
> com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:102)
> at
> com.google.apphosting.runtime.ApiProxyImpl.makeSyncCall(ApiProxyImpl.java:43)
>
>
> at
> com.google.appengine.tools.appstats.Recorder.makeSyncCall(Recorder.java:225)
> at com.google.apphosting.api.ApiProxy.makeSyncCall(ApiProxy.java:102)
> at
> com.google.appengine.api.urlfetch.URLFetchServiceImpl.fetch(URLFetchServiceImpl.java:34)
>
> was this yours? :)
>
> If you're using Spring, new T5 instance startup may take longer than 30
> secs which will lead to deadline exception. I used Spring for transaction
> management before, but I refused to use it and using Tynamo now.
>
> I also noticed that exceptions make take pretty much time of request, so if
> you have any exceptions (no matter handled or not) requests become longer. I
> found that if you're using Tynamo, you usually get one RollbackException at
> the end of each request.
>
> 2. The other reason of deadline exceptions for me are long database
> requests. I found that in some cases datastore queries (even simple queries)
> may take too many time to process sometime, but in other cases the same
> queries run pretty fast.
>
> p.s.
> favicon.ico is not an issue actually, all you need to fix it is put
> favicon.ico icon to your app.
> I already have favicon, but its with *.png extension. Looks like some
> browsers still looking for *.ico...
> I should convert that *.png to *.ico ... can't settle down to this :)
>
>
>
> On Tue, Apr 13, 2010 at 18:36, Alex Kotchnev <akoch...@gmail.com> wrote:
>
>> Dmitry,
>> I do have the favicon.ico issue showing up in the logs as well, I'll
>> need
>> to look into that. Do you have anything special set up for the "static
>> files" section in the appengine config xml file ?
>>
>> The problem w/ the failed requests for assets is that they don't show up
>> in the error log. Every once in a while, I'd get an error like this (which
>> shouldn't happen - a request to a simple page should never take 30
>> seconds)
>> :
>>
>> Regards,
>>
>> Alex K
>>
>> Error for /faq
>> com.google.apphosting.runtime.HardDeadlineExceededError: This request
>> (b2c1ec272f017727) started at 2010/04/10 10:56:07.705 UTC and was
>> still executing at 2010/04/10 10:56:36.820 UTC.
>>
>> at
>> org.apache.tapestry5.ioc.util.CaseInsensitiveMap.access$008(CaseInsensitiveMap.java:30)
>> at
>> org.apache.tapestry5.ioc.util.CaseInsensitiveMap$Position.put(CaseInsensitiveMap.java:287)
>> at
>> org.apache.tapestry5.ioc.util.CaseInsensitiveMap.put(CaseInsensitiveMap.java:355)
>>
>> at
>> org.apache.tapestry5.ioc.util.CaseInsensitiveMap.put(CaseInsensitiveMap.java:30)
>> at
>> org.apache.tapestry5.ioc.internal.services.ClassPropertyAdapterImpl.<init>(ClassPropertyAdapterImpl.java:53)
>> at
>> org.apache.tapestry5.ioc.internal.services.PropertyAccessImpl.buildAdapter(PropertyAccessImpl.java:92)
>>
>> at
>> org.apache.tapestry5.ioc.internal.services.PropertyAccessImpl.getAdapter(PropertyAccessImpl.java:65)
>> at
>> $PropertyAccess_127e75ce676.getAdapter($PropertyAccess_127e75ce676.java)
>> at
>> org.apache.tapestry5.internal.services.PropertyConduitSourceImpl$PropertyConduitBuilder.infoForPropertyNode(PropertyConduitSourceImpl.java:978)
>>
>> at
>> org.apache.tapestry5.internal.services.PropertyConduitSourceImpl$PropertyConduitBuilder.infoForPropertyOrMethod(PropertyConduitSourceImpl.java:971)
>> at
>> org.apache.tapestry5.internal.services.PropertyConduitSourceImpl$PropertyConduitBuilder.createGetterAndSetter(PropertyConduitSourceImpl.java:433)
>>
>> at
>> org.apache.tapestry5.internal.services.PropertyConduitSourceImpl$PropertyConduitBuilder.createAccessors(PropertyConduitSourceImpl.java:416)
>> at
>> org.apache.tapestry5.internal.services.PropertyConduitSourceImpl$PropertyConduitBuilder.createInstance(PropertyConduitSourceImpl.java:270)
>>
>> at
>> org.apache.tapestry5.internal.services.PropertyConduitSourceImpl.build(PropertyConduitSourceImpl.java:1254)
>> at
>> org.apache.tapestry5.internal.services.PropertyConduitSourceImpl.create(PropertyConduitSourceImpl.java:1121)
>>
>> at
>> $PropertyConduitSource_127e75ce6ee.create($PropertyConduitSource_127e75ce6ee.java)
>> at
>> org.apache.tapestry5.internal.bindings.PropBindingFactory.newBinding(PropBindingFactory.java:49)
>> at
>> $BindingFactory_127e75ce6ef.newBinding($BindingFactory_127e75ce6ef.java)
>>
>> at
>> $BindingFactory_127e75ce6e7.newBinding($BindingFactory_127e75ce6e7.java)
>> at
>> org.apache.tapestry5.internal.services.BindingSourceImpl.newBinding(BindingSourceImpl.java:81)
>> at
>> $BindingSource_127e75ce6c5.newBinding($BindingSource_127e75ce6c5.java)
>>
>> at
>> org.apache.tapestry5.internal.services.PageElementFactoryImpl.newExpansionElement(PageElementFactoryImpl.java:165)
>> at
>> $PageElementFactory_127e75ce6df.newExpansionElement($PageElementFactory_127e75ce6df.java)
>> at
>> org.apache.tapestry5.internal.pageload.PageLoaderImpl$15.execute(PageLoaderImpl.java:1024)
>>
>> at
>> org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.runActions(ComponentAssemblerImpl.java:207)
>> at
>> org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.assembleEmbeddedComponent(ComponentAssemblerImpl.java:157)
>>
>> at
>> org.apache.tapestry5.internal.pageload.PageLoaderImpl$12.execute(PageLoaderImpl.java:947)
>> at
>> org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.runActions(ComponentAssemblerImpl.java:207)
>> at
>> org.apache.tapestry5.internal.pageload.ComponentAssemblerImpl.assembleRootComponent(ComponentAssemblerImpl.java:88)
>>
>> at
>> org.apache.tapestry5.internal.pageload.PageLoaderImpl.loadPage(PageLoaderImpl.java:159)
>> at $PageLoader_127e75ce6d1.loadPage($PageLoader_127e75ce6d1.java)
>> at
>> org.apache.tapestry5.internal.services.PagePoolCache.checkout(PagePoolCache.java:210)
>>
>> at
>> org.apache.tapestry5.internal.services.PagePoolImpl.checkout(PagePoolImpl.java:99)
>> at $PagePool_127e75ce6d0.checkout($PagePool_127e75ce6d0.java)
>> at
>> org.apache.tapestry5.internal.services.RequestPageCacheImpl.get(RequestPageCacheImpl.java:51)
>>
>> at
>> $RequestPageCache_127e75ce6cf.get($RequestPageCache_127e75ce6cf.java)
>> at
>> $RequestPageCache_127e75ce6b8.get($RequestPageCache_127e75ce6b8.java)
>> at
>> org.apache.tapestry5.internal.services.PageRenderRequestHandlerImpl.handle(PageRenderRequestHandlerImpl.java:52)
>>
>> at
>> org.apache.tapestry5.services.TapestryModule$33.handle(TapestryModule.java:2262)
>> at
>> $PageRenderRequestHandler_127e75ce6bb.handle($PageRenderRequestHandler_127e75ce6bb.java)
>> at
>> $PageRenderRequestHandler_127e75ce6a3.handle($PageRenderRequestHandler_127e75ce6a3.java)
>>
>> at
>> org.apache.tapestry5.internal.services.ComponentRequestHandlerTerminator.handlePageRender(ComponentRequestHandlerTerminator.java:48)
>> at
>> $ComponentRequestHandler_127e75ce6a8.handlePageRender($ComponentRequestHandler_127e75ce6a8.java)
>>
>> at
>> org.apache.tapestry5.internal.services.PageRenderDispatcher.dispatch(PageRenderDispatcher.java:45)
>> at $Dispatcher_127e75ce6aa.dispatch($Dispatcher_127e75ce6aa.java)
>> at $Dispatcher_127e75ce6a0.dispatch($Dispatcher_127e75ce6a0.java)
>>
>> at
>> org.apache.tapestry5.services.TapestryModule$RequestHandlerTerminator.service(TapestryModule.java:255)
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.RequestFilterWrapper$1.doFilter(RequestFilterWrapper.java:60)
>>
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.SpringSecurityExceptionTranslationFilter.doFilterHttp(SpringSecurityExceptionTranslationFilter.java:100)
>> at
>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.RequestFilterWrapper.service(RequestFilterWrapper.java:55)
>> at
>> $RequestHandler_127e75ce6a1.service($RequestHandler_127e75ce6a1.java)
>> at
>> org.apache.tapestry5.internal.services.RequestErrorFilter.service(RequestErrorFilter.java:26)
>>
>> at
>> $RequestHandler_127e75ce6a1.service($RequestHandler_127e75ce6a1.java)
>> at
>> org.apache.tapestry5.services.TapestryModule$4.service(TapestryModule.java:937)
>> at
>> $RequestHandler_127e75ce6a1.service($RequestHandler_127e75ce6a1.java)
>>
>> at
>> org.apache.tapestry5.services.TapestryModule$3.service(TapestryModule.java:926)
>> at
>> $RequestHandler_127e75ce6a1.service($RequestHandler_127e75ce6a1.java)
>> at
>> org.apache.tapestry5.internal.services.StaticFilesFilter.service(StaticFilesFilter.java:85)
>>
>> at
>> $RequestHandler_127e75ce6a1.service($RequestHandler_127e75ce6a1.java)
>> at
>> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:90)
>> at
>> org.apache.tapestry5.internal.services.CheckForUpdatesFilter$2.invoke(CheckForUpdatesFilter.java:81)
>>
>> at
>> org.apache.tapestry5.ioc.internal.util.ConcurrentBarrier.withRead(ConcurrentBarrier.java:85)
>> at
>> org.apache.tapestry5.internal.services.CheckForUpdatesFilter.service(CheckForUpdatesFilter.java:103)
>> at
>> $RequestHandler_127e75ce6a1.service($RequestHandler_127e75ce6a1.java)
>>
>> at
>> $RequestHandler_127e75ce695.service($RequestHandler_127e75ce695.java)
>> at
>> org.apache.tapestry5.services.TapestryModule$HttpServletRequestHandlerTerminator.service(TapestryModule.java:206)
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:56)
>>
>> at
>> org.springframework.security.intercept.web.FilterSecurityInterceptor.invoke(FilterSecurityInterceptor.java:109)
>> at
>> org.springframework.security.intercept.web.FilterSecurityInterceptor.doFilter(FilterSecurityInterceptor.java:83)
>>
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
>> at
>> $HttpServletRequestFilter_127e75ce693.service($HttpServletRequestFilter_127e75ce693.java)
>>
>> at
>> $HttpServletRequestHandler_127e75ce697.service($HttpServletRequestHandler_127e75ce697.java)
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.HttpServletRequestFilterWrapper$1.doFilter(HttpServletRequestFilterWrapper.java:56)
>>
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.SpringSecurityExceptionTranslationFilter.doFilterHttp(SpringSecurityExceptionTranslationFilter.java:100)
>> at
>> org.springframework.security.ui.SpringSecurityFilter.doFilter(SpringSecurityFilter.java:53)
>>
>> at
>> nu.localhost.tapestry5.springsecurity.services.internal.HttpServletRequestFilterWrapper.service(HttpServletRequestFilterWrapper.java:52)
>> at
>> $HttpServletRequestHandler_127e75ce697.service($HttpServletRequestHandler_127e75ce697.java)
>>
>> at nu.loca
>>
>>
>>
>> On Tue, Apr 13, 2010 at 9:31 AM, Dmitry Gusev <dmitry.gu...@gmail.com
>> >wrote:
>>
>> > Hi, Alex
>> >
>> > I'm including *.css and *.png by simply using link rel, like this:
>> >
>> > <link rel="stylesheet" type="text/css"
>> > href="/assets/anjlab/cubics/css/cube.css" />
>> >
>> > cube.css located here:
>> >
>> >
>> >
>> ping-service\war\WEB-INF\lib\cubics-renders-1.0.1.jar\anjlab\cubics\css\cube.css
>> >
>> > I also set up regexAuthorizer:
>> >
>> > public void contributeRegexAuthorizer(Configuration<String> regex)
>> > {
>> > String pathPattern =
>> > "([^/.]+/)*[^/.]+\\.((css)|(js)|(jpg)|(jpeg)|(png)|(gif))$";
>> > regex.add("^anjlab/cubics/css/" + pathPattern);
>> > regex.add("^anjlab/cubics/images/" + pathPattern);
>> > regex.add("^anjlab/cubics/js/" + pathPattern);
>> > regex.add("^anjlab/cubics/js/jquery-1.3.2.js");
>> > }
>> >
>> > I can't say I have any problems with this.
>> > At least right now in my error list at GAE Admin console I don't have
>> any
>> > assets related issues.
>> >
>> > I have only one page actively using *.css, *.js, etc., here's the
>> > declarations:
>> >
>> > <head>
>> > <title>Job Analytics - Ping Service</title>
>> > <link rel="stylesheet" type="text/css" href="/css/all.css" />
>> > <link rel="icon" type="image/png" href="/favicon.png" />
>> > <link rel="stylesheet" type="text/css"
>> > href="/assets/anjlab/cubics/css/cube.css" />
>> > <link rel="stylesheet" type="text/css" href="/css/analytics.css" />
>> > <script type="text/javascript"
>> > src="/assets/anjlab/cubics/js/jquery-1.3.2.js"></script>
>> > <script type="text/javascript"
>> > src="/assets/anjlab/cubics/js/cube.js"></script>
>> > <!--[if IE]><script language="javascript" type="text/javascript"
>> > src="excanvas.min.js"></script><![endif]-->
>> > <script type="text/javascript" src="/js/jquery.flot.js"></script>
>> > <script type="text/javascript" src="/js/jquery.flot.pie.js"></script>
>> > <script type="text/javascript" src="/js/analytics.js"></script>
>> > </head>
>> >
>> > p.s.
>> > One issue I have though is '/favicon.ico' problem :)
>> >
>> > On Tue, Apr 13, 2010 at 17:20, Alex Kotchnev <akoch...@gmail.com>
>> wrote:
>> >
>> > > Daniel,
>> > > I do try to watch out for T5/GAE related posts on this list and try
>> to
>> > > respond to the best of my ability. I would blog about this more if I
>> > > weren't
>> > > as swamped with things to do.
>> > >
>> > > I would be interested in hearing from other folks (e.g. Dmitry) that
>> > have
>> > > deployed on GAE - in previous questions relating to this issue, folks
>> had
>> > > mentioned that they don't have a problem w/ this, which makes me think
>> > that
>> > > I might have something configured incorrectly (although I'm not doing
>> > > special here, other than having a few images loaded from the
>> > stylesheet).
>> > > I
>> > > do use the AssetAuthorizer (that was eventually added to 5.2) and
>> that's
>> > > another possible failure point (e.g. if for whatever reason, the
>> > > authorization fails in some cases and denies access).
>> > >
>> > > On the other hand, serving these assets as static content has
>> dropped
>> > my
>> > > CPU usage - I had an cron job watching the site and keeping it warm
>> (so
>> > > that
>> > > GAE doesn't swap it out), which was using up about 40% of the free CPU
>> > > quota
>> > > - so far, the CPU usage should be about 20% lower.
>> > >
>> > > Regards,
>> > >
>> > > Alex Kotchnev
>> > >
>> > > On Tue, Apr 13, 2010 at 3:44 AM, Daniel Henze <dhe...@googlemail.com>
>> > > wrote:
>> > >
>> > > > Hi Alex,
>> > > >
>> > > > thanks for that follow-up post. Since I'm going to develop with T5
>> on
>> > GAE
>> > > > as well, this will be in the back of my head as a potential cave-at.
>> > I'll
>> > > be
>> > > > interested in any further findings regarding GAE since it seems that
>> > > > Tapestry is better tailored towards this particular platform
>> (compared
>> > to
>> > > > Wicket).
>> > > >
>> > > > Best regards
>> > > > Daniel
>> > > >
>> > > > Am 13.04.2010 06:23, schrieb Alex Kotchnev:
>> > > >
>> > > > I spent some more time looking at this and I ended up removing the
>> > usage
>> > > >> of
>> > > >> the ${asset:context:css/foobar.css} from the main templates. After
>> > doing
>> > > >> so,
>> > > >> all of the issues related to the stylesheet (and the
>> sub-stylesheets
>> > and
>> > > >> images that it loads) were cleared up - now, the stylesheets load
>> > > properly
>> > > >> every time when they're not loaded through the asset service.
>> > > >>
>> > > >> I first thought that this might be an issue w/ how GAE handles
>> static
>> > > >> files
>> > > >> - supposedly, all files in the web context are handled specially (
>> w/
>> > > the
>> > > >> exception of JSPs of course, but that's not relevant in T5),
>> probably
>> > > >> served
>> > > >> up from outside of Jetty (which is what runs the app in GAE) and
>> there
>> > > >> might
>> > > >> be something that is weird in GAE giving access to those static
>> > assets.
>> > > >> However, after I switched to just using the raw path to the css
>> (w/o
>> > > using
>> > > >> the asset:context binding prefixes), I continued having the same
>> > > >> intermittent access issues for assets that are served from a
>> > component.
>> > > >> Which on its own indicates that the issue is somewhere between the
>> > Asset
>> > > >> service (which I haven't looked at the source code for yet) and the
>> > way
>> > > it
>> > > >> uses the servlet API and/or the filesystem to serve the assets that
>> > it's
>> > > >> asked for.
>> > > >>
>> > > >> I haven't moved all my css / image serving out of the asset service
>> -
>> > it
>> > > >> has
>> > > >> some cool ideas in terms of being able to package the app. However,
>> > > >> considering that I'm dealing w/ a fairly simple app, and despite
>> that
>> > I
>> > > >> like
>> > > >> the ideas behind the asset service, I'll probably move off of it -
>> I
>> > do
>> > > >> recall seeing some mentions of an alternative binding prefix to
>> serve
>> > > the
>> > > >> assets in question from a CDN ; however, considering that the
>> google
>> > > >> static
>> > > >> file serving infrastructure is probably as good as serving from a
>> CDN,
>> > > >> I'll
>> > > >> probably just stick to static files.
>> > > >>
>> > > >> Anyway, I thought this might be useful to someone else that might
>> run
>> > > into
>> > > >> issues with the Asset service and GAE. It would be interesting to
>> look
>> > > at
>> > > >> the asset service implementation and see if there is an issue to be
>> > > filed
>> > > >> w/
>> > > >> GAE re: accessing resources (classpath and web context).
>> > > >>
>> > > >> Regards,
>> > > >>
>> > > >> Alex K
>> > > >>
>> > > >> On Mon, Apr 12, 2010 at 1:27 PM, akochnev_chub<
>> > akoch...@commercehub.com
>> > > >> >wrote:
>> > > >>
>> > > >>
>> > > >>
>> > > >>> I've been running into some issues w/ the asset service, in that
>> at
>> > > times
>> > > >>> it
>> > > >>> responds to service requests with 404s. After "warming up" the app
>> by
>> > > >>> reloading the pages in question a few times, the asset service
>> > > eventually
>> > > >>> responds w/ the assets. However, this results in a very unreliable
>> > > >>> rendering
>> > > >>> of the pages - at times (if the app happens to be "warm"), the
>> pages
>> > > >>> render
>> > > >>> just fine; at other times, I have to reload them a few times
>> before
>> > > >>> getting
>> > > >>> to proper rendering. Below are some more details on the issue,
>> any
>> > > >>> suggestions on how to deal w/ it would be highly appreciated.
>> > > >>>
>> > > >>>
>> > > >>> There is a pretty good chance that this might be an issue w/ the
>> > > >>> underlying
>> > > >>> platform (GAE), and the way it chooses to swap the application in
>> and
>> > > >>> out;
>> > > >>> however, if that were the case, I would have expected more of the
>> > > >>> requests
>> > > >>> to fail instead of the page content rendering fine and then the
>> > assets
>> > > >>> not
>> > > >>> returning in time.
>> > > >>>
>> > > >>> I think the issue is partially aggravated by the fact that I load
>> the
>> > > >>> main
>> > > >>> stylesheet as a context asset (asset:context:/css/foo.css or
>> > something
>> > > >>> similar), instead of just using the "naked" (e.g. /css/foo.css w/o
>> a
>> > > >>> context: prefix) path to the css in the layout; as a result, all
>> of
>> > the
>> > > >>> "other" css (using yaml for layout) and the images referenced by
>> the
>> > > main
>> > > >>> css depend on the asset service (e.g.
>> > > >>>
>> > > >>>
>> > > >>>
>> > >
>> >
>> http://zadachite-dev.appspot.com/assets/ctx/91328db67ddf7725/images/layout_v2/footer.jpg
>> > > >>> )
>> > > >>> instead of just being loaded as static files. I was thinking that
>> > > >>> switching
>> > > >>> the reference to the main stylesheet to not be a context:
>> reference
>> > and
>> > > >>> marking the web app context resources as static (in the GAE web
>> > config
>> > > >>> file)
>> > > >>> might resolve the issue.
>> > > >>>
>> > > >>> So, here's an example :
>> > > >>> 1. go to http://zadachite-dev.appspot.com (this is the "dev"
>> version
>> > > >>> which
>> > > >>> is unlikely to be warm right now)
>> > > >>>
>> > > >>> 2. Upon the initial loading of the pages, some of the graphics
>> (more
>> > or
>> > > >>> less
>> > > >>> randomly) or stylesheets don't return as they get 404s:
>> > > >>>
>> > > >>> <html><head>
>> > > >>> <meta http-equiv="content-type" content="text/html;charset=utf-8">
>> > > >>> <title>404 Unable to locate asset
>> > > >>> 'classpath:ctx/91328db67ddf7725/yaml/core/base.css' (the file does
>> > not
>> > > >>> exist).</title>
>> > > >>> </head>
>> > > >>> <body text=#000000 bgcolor=#ffffff>
>> > > >>> <h1>Error: Unable to locate asset
>> > > >>> 'classpath:ctx/91328db67ddf7725/yaml/core/base.css' (the file does
>> > not
>> > > >>> exist).</h1>
>> > > >>> </body></html>
>> > > >>>
>> > > >>>
>> > > >>> or for images, it's a straight 404 w/o any further response.
>> > > >>>
>> > > >>> 3. Browse to some of the other pages of the site - one by one, the
>> > > >>> "missing"
>> > > >>> assets start showing up one by one and eventually the layout
>> renders
>> > > >>> correctly. After the app is "warmed up" now, even if you refresh
>> the
>> > > page
>> > > >>> including the initially cached assets, they load fine.
>> > > >>> --
>> > > >>> View this message in context:
>> > > >>>
>> > > >>>
>> > >
>> >
>> http://old.nabble.com/Asset-service-issues-in-GAE-tp28219164p28219164.html
>> > > >>> Sent from the Tapestry - User mailing list archive at Nabble.com.
>> > > >>>
>> > > >>>
>> > > >>>
>> ---------------------------------------------------------------------
>> > > >>> To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
>> > > >>> For additional commands, e-mail: users-h...@tapestry.apache.org
>> > > >>>
>> > > >>>
>> > > >>>
>> > > >>>
>> > > >>
>> > > >>
>> > > >
>> > > >
>> ---------------------------------------------------------------------
>> > > > To unsubscribe, e-mail: users-unsubscr...@tapestry.apache.org
>> > > > For additional commands, e-mail: users-h...@tapestry.apache.org
>> > > >
>> > > >
>> > >
>> >
>> >
>> >
>> > --
>> > Dmitry Gusev
>> >
>> > AnjLab Team
>> > http://anjlab.com
>> >
>>
>
>
>
> --
> Dmitry Gusev
>
> AnjLab Team
> http://anjlab.com
>
--
Dmitry Gusev
AnjLab Team
http://anjlab.com
