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  • Emil Badh 8 posts 29 karma points
    Mar 20, 2014 @ 10:14
    Emil Badh
    0

    Occasional NullReferenceException only resolvable by restarting application pool.

    I've noticed that others are getting the same problem. I have not been able to determine the cause of the problem and I have not been able to actually solve the problem, only temporarily make it go away by various means mentioned in other posts. (Recycling app-pool, throwing out indices...) It always reoccur though.

    One poster was asked about load balancing. The site where I have the problem is load balanced with synced folders. Could this be the cause of the problem?

    I'm submitting a dump from the windows log, hoping it might help.

    Application information: 

        Application domain: /LM/W3SVC/27/ROOT-1-130397762940904712 

        Trust level: Full 

        Application Virtual Path: / 

        Application Path: d:\inetpub_synced\*******\ 

        Machine name: ******* 

     

    Process information: 

        Process ID: 3484 

        Process name: w3wp.exe 

        Account name: IIS APPPOOL\*******

     

    Exception information: 

        Exception type: NullReferenceException 

        Exception message: Object reference not set to an instance of an object.

       at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.b__2(UmbracoContext context, Boolean preview)

       at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.GetById(UmbracoContext umbracoContext, Boolean preview, Int32 nodeId)

       at Umbraco.Web.PublishedCache.ContextualPublishedCache`1.GetById(Boolean preview, Int32 contentId)

       at Umbraco.Web.UmbracoHelper.TypedDocumentById(Int32 id, ContextualPublishedCache cache)

       at uHelpsy.Helpers.IPublishedContentHelper.GetNode(Int32 nodeId) in D:\_PROJECTS\Personal\uHelpsy - Library\uHelpsy\Source\uHelpsy.Web\Helpers\IPublishedContentHelper.cs:line 24

       at uHelpsy.Extensions.CollectionExtensions.b__6(SearchResult x) in D:\_PROJECTS\Personal\uHelpsy - Library\uHelpsy\Source\uHelpsy.Web\Extensions\CollectionExtensions.cs:line 54

       at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()

       at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()

       at ASP._Page_Views_Partials_uBlogsy_Landing_uBlogsyLandingListPosts_cshtml.<>c__DisplayClass2.b__1(TextWriter __razor_helper_writer) in d:\inetpub_synced\*******\Views\Partials\uBlogsy\Landing\uBlogsyLandingListPosts.cshtml:line 67

       at ASP._Page_Views_Partials_uBlogsy_Landing_uBlogsyLandingListPosts_cshtml.Execute() in d:\inetpub_synced\*******\Views\Partials\uBlogsy\Landing\uBlogsyLandingListPosts.cshtml:line 52

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()

       at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)

       at StackExchange.Profiling.MVCHelpers.WrappedView.Render(ViewContext viewContext, TextWriter writer)

       at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)

       at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem[TT](String cacheKey, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, CacheDependency cacheDependency, Nullable`1 timeout, Func`1 getCacheItem, Object syncLock)

       at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem[TT](String cacheKey, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, CacheDependency cacheDependency, Nullable`1 timeout, Func`1 getCacheItem)

       at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem[TT](String cacheKey, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, Nullable`1 timeout, Func`1 getCacheItem)

       at Umbraco.Web.CacheHelperExtensions.CachedPartialView(CacheHelper cacheHelper, HtmlHelper htmlHelper, String partialViewName, Object model, Int32 cachedSeconds, String cacheKey, ViewDataDictionary viewData)

       at Umbraco.Web.HtmlHelperRenderExtensions.CachedPartial(HtmlHelper htmlHelper, String partialViewName, Object model, Int32 cachedSeconds, Boolean cacheByPage, Boolean cacheByMember, ViewDataDictionary viewData)

       at ASP._Page_Views_uBlogsyLanding_cshtml.b__2() in d:\inetpub_synced\*******\Views\uBlogsyLanding.cshtml:line 23

       at System.Web.WebPages.WebPageBase.<>c__DisplayClassb.b__9(TextWriter tw)

       at ASP._Page_Views__uBlogsyBaseBlog_cshtml.b__7() in d:\inetpub_synced\*******\Views\_uBlogsyBaseBlog.cshtml:line 35

       at System.Web.WebPages.WebPageBase.<>c__DisplayClassb.b__9(TextWriter tw)

       at ASP._Page_Views__uBlogsyBaseSite_cshtml.Execute() in d:\inetpub_synced\*******\Views\_uBlogsyBaseSite.cshtml:line 44

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()

       at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)

       at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body)

       at System.Web.WebPages.WebPageBase.PopContext()

       at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body)

       at System.Web.WebPages.WebPageBase.PopContext()

       at StackExchange.Profiling.MVCHelpers.WrappedView.Render(ViewContext viewContext, TextWriter writer)

       at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)

       at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.b__17()

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)

       at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)

       at System.Web.Mvc.Controller.<>c__DisplayClass1d.b__19()

       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.b__0()

       at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)

       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar)

       at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.b__3(IAsyncResult asyncResult)

       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar)

       at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

       at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

     

    Request information: 

        Request URL: http://*******/blogg 

        Request path: /blogg 

        User host address: ******* 

        User:  

        Is authenticated: False 

        Authentication Type:  

        Thread account name: IIS APPPOOL\*******

     

    Thread information: 

        Thread ID: 10 

        Thread account name: IIS APPPOOL\***********

        Is impersonating: False 

     

        Stack trace:    at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.b__2(UmbracoContext context, Boolean preview)

       at Umbraco.Web.PublishedCache.XmlPublishedCache.PublishedContentCache.GetById(UmbracoContext umbracoContext, Boolean preview, Int32 nodeId)

       at Umbraco.Web.PublishedCache.ContextualPublishedCache`1.GetById(Boolean preview, Int32 contentId)

       at Umbraco.Web.UmbracoHelper.TypedDocumentById(Int32 id, ContextualPublishedCache cache)

       at uHelpsy.Helpers.IPublishedContentHelper.GetNode(Int32 nodeId) in D:\_PROJECTS\Personal\uHelpsy - Library\uHelpsy\Source\uHelpsy.Web\Helpers\IPublishedContentHelper.cs:line 24

       at uHelpsy.Extensions.CollectionExtensions.b__6(SearchResult x) in D:\_PROJECTS\Personal\uHelpsy - Library\uHelpsy\Source\uHelpsy.Web\Extensions\CollectionExtensions.cs:line 54

       at System.Linq.Enumerable.WhereSelectEnumerableIterator`2.MoveNext()

       at System.Linq.Enumerable.WhereEnumerableIterator`1.MoveNext()

       at ASP._Page_Views_Partials_uBlogsy_Landing_uBlogsyLandingListPosts_cshtml.<>c__DisplayClass2.b__1(TextWriter __razor_helper_writer) in d:\inetpub_synced\*******\Views\Partials\uBlogsy\Landing\uBlogsyLandingListPosts.cshtml:line 67

       at ASP._Page_Views_Partials_uBlogsy_Landing_uBlogsyLandingListPosts_cshtml.Execute() in d:\inetpub_synced\*******\Views\Partials\uBlogsy\Landing\uBlogsyLandingListPosts.cshtml:line 52

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()

       at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)

       at StackExchange.Profiling.MVCHelpers.WrappedView.Render(ViewContext viewContext, TextWriter writer)

       at System.Web.Mvc.Html.PartialExtensions.Partial(HtmlHelper htmlHelper, String partialViewName, Object model, ViewDataDictionary viewData)

       at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem[TT](String cacheKey, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, CacheDependency cacheDependency, Nullable`1 timeout, Func`1 getCacheItem, Object syncLock)

       at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem[TT](String cacheKey, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, CacheDependency cacheDependency, Nullable`1 timeout, Func`1 getCacheItem)

       at Umbraco.Core.Cache.HttpRuntimeCacheProvider.GetCacheItem[TT](String cacheKey, CacheItemPriority priority, CacheItemRemovedCallback refreshAction, Nullable`1 timeout, Func`1 getCacheItem)

       at Umbraco.Web.CacheHelperExtensions.CachedPartialView(CacheHelper cacheHelper, HtmlHelper htmlHelper, String partialViewName, Object model, Int32 cachedSeconds, String cacheKey, ViewDataDictionary viewData)

       at Umbraco.Web.HtmlHelperRenderExtensions.CachedPartial(HtmlHelper htmlHelper, String partialViewName, Object model, Int32 cachedSeconds, Boolean cacheByPage, Boolean cacheByMember, ViewDataDictionary viewData)

       at ASP._Page_Views_uBlogsyLanding_cshtml.b__2() in d:\inetpub_synced\*******\Views\uBlogsyLanding.cshtml:line 23

       at System.Web.WebPages.WebPageBase.<>c__DisplayClassb.b__9(TextWriter tw)

       at ASP._Page_Views__uBlogsyBaseBlog_cshtml.b__7() in d:\inetpub_synced\*******\Views\_uBlogsyBaseBlog.cshtml:line 35

       at System.Web.WebPages.WebPageBase.<>c__DisplayClassb.b__9(TextWriter tw)

       at ASP._Page_Views__uBlogsyBaseSite_cshtml.Execute() in d:\inetpub_synced\*******\Views\_uBlogsyBaseSite.cshtml:line 44

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy()

       at System.Web.Mvc.WebViewPage.ExecutePageHierarchy()

       at System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage)

       at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body)

       at System.Web.WebPages.WebPageBase.PopContext()

       at System.Web.WebPages.WebPageBase.RenderSurrounding(String partialViewName, Action`1 body)

       at System.Web.WebPages.WebPageBase.PopContext()

       at StackExchange.Profiling.MVCHelpers.WrappedView.Render(ViewContext viewContext, TextWriter writer)

       at System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context)

       at System.Web.Mvc.ControllerActionInvoker.<>c__DisplayClass1a.b__17()

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation)

       at System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult)

       at System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName)

       at System.Web.Mvc.Controller.<>c__DisplayClass1d.b__19()

       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass1.b__0()

       at System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult)

       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar)

       at System.Web.Mvc.MvcHandler.<>c__DisplayClass8.b__3(IAsyncResult asyncResult)

       at System.Web.Mvc.Async.AsyncResultWrapper.<>c__DisplayClass4.b__3(IAsyncResult ar)

       at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

       at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

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  • Ismail Mayat 4511 posts 10092 karma points MVP 2x admin c-trib
    Mar 20, 2014 @ 12:45
    Ismail Mayat
    0

    Emil,

    Do you have it setup to use datefolders? I am assuming you do. The other day i had to go through the udatefoldersy source because my date folders were not being created (see http://bit.ly/1qYTIOD for the source). One thing i noticed is that there is a flag added to HttpContext.Current.Items its something to do with preventing infinite loop i think now in load balanced scenario after publish another publish is triggered on the other servers in the cluster so maybe this is causing an issue? Just a thought.

    Regards

    Ismail

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  • Emil Badh 8 posts 29 karma points
    Mar 21, 2014 @ 09:20
    Emil Badh
    0

    I do use date folders. The load balancer works by one server being the master and the other simply copies the master's files. But I guess it's possible the request "spills over" to the other server. But then, why does it only happen once in a while?

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