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From "Dominik Psenner (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LOG4NET-393) Using dynamic methods with log4net causes NullReferenceException in StackFrameItem
Date Tue, 01 Oct 2013 14:56:24 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13783012#comment-13783012
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Dominik Psenner edited comment on LOG4NET-393 at 10/1/13 2:55 PM:
------------------------------------------------------------------

Fixed as of revision: 1528110

Sorry for the inconvenience. Would you please try if the issue is fixed in svn?


was (Author: nachbarslumpi):
Fixed as of revision: 1528110

Sorry for the inconvenience.

> Using dynamic methods with log4net causes NullReferenceException in StackFrameItem
> ----------------------------------------------------------------------------------
>
>                 Key: LOG4NET-393
>                 URL: https://issues.apache.org/jira/browse/LOG4NET-393
>             Project: Log4net
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 1.2.12
>         Environment: VS2012, Windows 7
>            Reporter: W.R. Dittmer
>            Assignee: Dominik Psenner
>            Priority: Blocker
>             Fix For: 1.2.13
>
>         Attachments: Log4netLambaExpressionTest.zip
>
>
> In our production code we use dynamic methods e.g. when using the factory pattern. We
upgraded from 1.2.10 to 1.2.12 and encountered the following exception:
> log4net:ERROR An exception ocurred while retreiving stack frame information.
> System.NullReferenceException: Object reference not set to an instance of an object.
>    at log4net.Core.StackFrameItem..ctor(StackFrame frame) in c:\Users\wilfred.dittmer\Documents\Visual
Studio 2012\Projects\Log4netLambaExpressionTest\log4net-1.2.12-src\log4net-1.2.12\src\Core\StackFrameItem.cs:line
61
> I created a test project (attached) which shows the exception occuring.
> If the the method is: {System.Object lambda_method(System.Runtime.CompilerServices.Closure)}
> then one cannot access the DeclaringType. The code then tries to get the FullName of
the null value which causes the exception.
> According to: http://msdn.microsoft.com/en-us/library/system.reflection.emit.dynamicmethod.declaringtype.aspx
> "DynamicMethod.DeclaringType: Gets the type that declares the method, which is always
null for dynamic methods."
> So it seems best to check if DeclaringType is null and if so leave the m_className set
to 'NA'.



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