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Created by Chester Campbell Jr 12 Jul 2013, 21:38:16 Updated by Sebastiaan Janssen 16 Jul 2013, 08:58:45
I recently upgraded a site from Umbraco 188.8.131.52 to 6.1.2 successfully. I noticed though that upon the first document publish after the site has recompiled (from app-pool reset or web.config change) I get a YSOD and a System.NullReferenceException error. If I click on my content node again it loads and I can see that the Save & Publish actually did work as my changes are there.
All subsequent Save & Publishes work normally.
The stack trace for the error is:
[NullReferenceException: Object reference not set to an instance of an object.]
Umbraco.Web.Cache.DistributedCache.Refresh(Guid factoryGuid, Func
2 getNumericId, T instances) +89 Umbraco.Web.Cache.DistributedCacheExtensions.RefreshPageCache(DistributedCache dc, IContent content) +190 Umbraco.Core.Events.TypedEventHandler2.Invoke(TSender sender, TEventArgs e) +0
Umbraco.Core.Services.ContentService.SaveAndPublishDo(IContent content, Int32 userId, Boolean raiseEvents) +1156
umbraco.cms.businesslogic.web.Document.SaveAndPublish(User u) +519
umbraco.cms.presentation.editContent.Publish(Object sender, EventArgs e) +318
System.Web.UI.WebControls.ImageButton.OnClick(ImageClickEventArgs e) +133
System.Web.UI.WebControls.ImageButton.RaisePostBackEvent(String eventArgument) +203
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +3803
I took a look at the contents of Umbraco.Core.Sync.ConfigServerRegistrar and what I think is happening is that line 38 ...
var nodes = _xmlServers.SelectNodes("./server");
... is throwing the exception because _xmlServers is null. Why is it null? _xmlServers should be populated in the class constructor by the parameter ... UmbracoSettings.DistributedServers.
Looking in Umbraco.Core.Configuration I see that DistributedServers is populated by attempting to read the a key in the umbracoSettings.config file. The key is question ... /settings/distributedCall/servers ... happens to be commented out in my config because I'm not running my server in distributed mode. The read is wrapped in a Try/Catch which of course fails and thus DistributedServers is set to null.
Umbraco.Core.Sync.ConfigServerRegistrar Registrations should test _xmlServers for null before attempting to do a SelectNodes().
Fixed in changeset 1e129bcc4d9273732137fe45286e085730822d59
Assigned to Shannon for code review to make sure this is the correct fix.
Just needs a little adjustment since the _addresses list always needs to be initialized even if _xmlServers is null. will fix up
D'oh, of course, thanks!
Assignee: Shannon Deminick
Backwards Compatible: True
Affected versions: 6.1.2
Due in version: 6.1.3