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From "W.R. Dittmer (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (LOG4NET-393) Using dynamic methods with log4net causes NullReferenceException in StackFrameItem
Date Wed, 02 Oct 2013 07:12:23 GMT

    [ https://issues.apache.org/jira/browse/LOG4NET-393?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13783016#comment-13783016
] 

W.R. Dittmer edited comment on LOG4NET-393 at 10/2/13 7:11 AM:
---------------------------------------------------------------

Thanks, we'll wait for the next official release and stick to 1.2.10 in the mean time.

Applied patch to the attached test project and it now runs.
Applied patch to production code, which now also runs.


was (Author: wdittmer):
Thanks, we'll wait for the next official release and stick to 1.2.10 in the mean time.

I will check the code change tomorrow and verify it fixes the attached project and 
works for our production software.

> 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 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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