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Posted to log4net-dev@logging.apache.org by "Stefan Bodewig (JIRA)" <ji...@apache.org> on 2013/11/06 20:32:17 UTC
[jira] [Reopened] (LOG4NET-393) Using dynamic methods with log4net
causes NullReferenceException in StackFrameItem
[ https://issues.apache.org/jira/browse/LOG4NET-393?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Stefan Bodewig reopened LOG4NET-393:
------------------------------------
Assignee: Stefan Bodewig (was: Dominik Psenner)
> 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: Stefan Bodewig
> Priority: Blocker
> Fix For: 1.3.0
>
> 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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