viktorgobbi opened a new issue, #162:
URL: https://github.com/apache/logging-log4net/issues/162
Hi,
we recently ran into a problem with log4net where
`PlatformNotSupportedException` are logged after we switched from the `net45`
assembly to the `netstandard2.0` assembly.
We ran into this issue with class libraries ( to provide powerShell cmdlets)
where we use log4net. We are currently in the process of migrating our projects
to target .net standard2.0 to support powerShell Core but after the migration
we noticed error messages when log4net is loaded in a powershell console
(powershell.exe) process. The following is logged to the console:
> log4net:ERROR Exception while reading ConfigurationSettings. Check your
.config file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system
failed to initialize ---> System.PlatformNotSupportedException: Operation is
not supported on this platform.
at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean
includeUserConfig)
at System.Configuration.ClientConfigPaths.GetPaths(String exePath,
Boolean includeUserConfig)
at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
at System.Configuration.ClientConfigurationHost.GetStreamName(String
configPath)
at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
at System.Configuration.ClientConfigurationSystem..ctor()
at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
--- End of inner exception stack trace ---
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.GetSection(String
sectionName)
at System.Configuration.ConfigurationManager.get_AppSettings()
at log4net.Util.SystemInfo.GetAppSetting(String key)
log4net:ERROR Exception while reading ConfigurationSettings. Check your
.config file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system
failed to initialize ---> System.PlatformNotSupportedException: Operation is
not supported on this platform.
at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean
includeUserConfig)
at System.Configuration.ClientConfigPaths.GetPaths(String exePath,
Boolean includeUserConfig)
at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
at System.Configuration.ClientConfigurationHost.GetStreamName(String
configPath)
at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
at System.Configuration.ClientConfigurationSystem..ctor()
at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
--- End of inner exception stack trace ---
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.GetSection(String
sectionName)
at System.Configuration.ConfigurationManager.get_AppSettings()
at log4net.Util.SystemInfo.GetAppSetting(String key)
log4net:ERROR Exception while reading ConfigurationSettings. Check your
.config file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system
failed to initialize ---> System.PlatformNotSupportedException: Operation is
not supported on this platform.
at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean
includeUserConfig)
at System.Configuration.ClientConfigPaths.GetPaths(String exePath,
Boolean includeUserConfig)
at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
at System.Configuration.ClientConfigurationHost.GetStreamName(String
configPath)
at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
at System.Configuration.ClientConfigurationSystem..ctor()
at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
--- End of inner exception stack trace ---
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.GetSection(String
sectionName)
at System.Configuration.ConfigurationManager.get_AppSettings()
at log4net.Util.SystemInfo.GetAppSetting(String key)
log4net:ERROR Exception while reading ConfigurationSettings. Check your
.config file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system
failed to initialize ---> System.PlatformNotSupportedException: Operation is
not supported on this platform.
at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean
includeUserConfig)
at System.Configuration.ClientConfigPaths.GetPaths(String exePath,
Boolean includeUserConfig)
at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
at System.Configuration.ClientConfigurationHost.GetStreamName(String
configPath)
at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
at System.Configuration.ClientConfigurationSystem..ctor()
at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
--- End of inner exception stack trace ---
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.GetSection(String
sectionName)
at System.Configuration.ConfigurationManager.get_AppSettings()
at log4net.Util.SystemInfo.GetAppSetting(String key)
log4net:ERROR Exception while reading ConfigurationSettings. Check your
.config file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system
failed to initialize ---> System.PlatformNotSupportedException: Operation is
not supported on this platform.
at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean
includeUserConfig)
at System.Configuration.ClientConfigPaths.GetPaths(String exePath,
Boolean includeUserConfig)
at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
at System.Configuration.ClientConfigurationHost.GetStreamName(String
configPath)
at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
at System.Configuration.ClientConfigurationSystem..ctor()
at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
--- End of inner exception stack trace ---
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.GetSection(String
sectionName)
at System.Configuration.ConfigurationManager.get_AppSettings()
at log4net.Util.SystemInfo.GetAppSetting(String key)
log4net:ERROR Exception while reading ConfigurationSettings. Check your
.config file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system
failed to initialize ---> System.PlatformNotSupportedException: Operation is
not supported on this platform.
at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean
includeUserConfig)
at System.Configuration.ClientConfigPaths.GetPaths(String exePath,
Boolean includeUserConfig)
at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
at System.Configuration.ClientConfigurationHost.GetStreamName(String
configPath)
at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
at System.Configuration.ClientConfigurationSystem..ctor()
at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
--- End of inner exception stack trace ---
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.GetSection(String
sectionName)
at System.Configuration.ConfigurationManager.get_AppSettings()
at log4net.Util.SystemInfo.GetAppSetting(String key)
log4net:ERROR Exception while reading ConfigurationSettings. Check your
.config file is well formed XML.
System.Configuration.ConfigurationErrorsException: Configuration system
failed to initialize ---> System.PlatformNotSupportedException: Operation is
not supported on this platform.
at System.Configuration.ClientConfigPaths..ctor(String exePath, Boolean
includeUserConfig)
at System.Configuration.ClientConfigPaths.GetPaths(String exePath,
Boolean includeUserConfig)
at System.Configuration.ClientConfigurationHost.get_ConfigPaths()
at System.Configuration.ClientConfigurationHost.GetStreamName(String
configPath)
at System.Configuration.ClientConfigurationHost.get_IsAppConfigHttp()
at System.Configuration.ClientConfigurationSystem..ctor()
at System.Configuration.ConfigurationManager.EnsureConfigurationSystem()
--- End of inner exception stack trace ---
at System.Configuration.ConfigurationManager.PrepareConfigSystem()
at System.Configuration.ConfigurationManager.GetSection(String
sectionName)
at System.Configuration.ConfigurationManager.get_AppSettings()
at log4net.Util.SystemInfo.GetAppSetting(String key)
This issue is not reproducible with the log4net assembly targeting `net45`.
I have tried to analyze this issue and traced it down to the following
points:
* The powershell.exe itself is not a manged application and therefore
`System.Reflection.Assembly.GetEntryAssembly()` returns `null` (easily
observable by starting a powershell.exe console and running
`[System.Reflection.Assembly]::GetEntryAssembly()`)
* The log4net build for .netstandard2.0 uses the
`System.Configuration.ConfigurationManager` in Version 4.5.0 which throws a
`PlatformNotSupportedException` when the `Assembly.GetEntryAssembly()` call
returns `null` but this was addressed with Version >= 5.0.0 and was tracked in
[dotnet/runtime#25027](https://github.com/dotnet/runtime/issues/25027)
* Finally the **static constructors** in:
*
https://github.com/apache/logging-log4net/blob/ad0180f9bfb712cd52bda28b74ec7d64ea7f3bb8/src/log4net/Core/LoggerManager.cs#L108
*
https://github.com/apache/logging-log4net/blob/ad0180f9bfb712cd52bda28b74ec7d64ea7f3bb8/src/log4net/Util/SystemInfo.cs#L85
* and
https://github.com/apache/logging-log4net/blob/ad0180f9bfb712cd52bda28b74ec7d64ea7f3bb8/src/log4net/Util/LogLog.cs#L174
call `log4net.Util.SystemInfo.GetAppSetting(string)` which for
netstandard2.0 calls `ConfigurationManager.AppSettings[key]` which ultimately
causes the exception that is logged.
I've tried using a newer version of the
`System.Configuration.ConfigurationManager` package but ran into similar issues
but with other error messages and since we only provide class libraries and
cannot modify the app.config for the powershell.exe we have no good way to
influence the binding behavior to get log4net working with a newer
`System.Configuration.ConfigurationManager` version in a production
environment. I did not figure out why the issue is not present in the log4net
assembly that is targeting net45 but I assume it has to do with the
implementation of `System.Configuration.ConfigurationManager` in .NET Framework
versus the one provided by the Nuget package.
We are using log4net 2.0.14 but the issue is also reproducible with the
latest version (v2.0.17 as of writing this).
I've attached a very simple solution to reproduce the issue
[log4netConfigErrorSln.zip](https://github.com/user-attachments/files/16444582/log4netConfigErrorSln.zip)
To reproduce it:
* Build the solution
* Start a powershell.exe and load the assembly in the powershell console
with `Add-Type -Path "<pathToSolutionOutput>\netstandard2.0\Lib1.dll"`
* Run `[Lib1.Lib1]::LogSomething()` in the powershell console to call the
static method and force log4net to initialize
Any suggestions or workarounds would be appreciated!
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