XML configuration: update="Merge" does not work as expected
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Key: LOG4NET-119
URL: https://issues.apache.org/jira/browse/LOG4NET-119
Project: Log4net
Issue Type: Bug
Components: Core
Affects Versions: 1.2.10
Environment: Microsoft .NET Framework 2.0
Reporter: Patrick Gautschi
Priority: Minor
To avoid a mandatory xml configuration file, I embeded it into the application
reading it with XmlConfigurator.Configure(Stream).
To allow the logging configuration to be changed when required, I also
read the now optional .config file of the application using
XmlConfigurator.Configure();
A minor problem is that when no log4net is specified in the .config file I get
the following error:
log4net:ERROR XmlConfigurator: Failed to find configuration section 'log4net'
in the application's .config file. Check your .config file for the <log4net>
and <configSections> elements. The configuration section should look like:
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler,log4net" />
There is a simple workaround (when not watching the file for changes):
if (System.Configuration.ConfigurationManager.GetSection("log4net") !=
null) {
XmlConfigurator.Configure();
}
But the real problem is, that I have to include the whole configuration into
the .config file, not just the changed parts even though using update="Merge".
As an example:
The embeded configuration looks like this
<log4net>
<appender name="ErrorFile" type="log4net.Appender.RollingFileAppender">
<threshold value="WARN" />
<file value="somepath/error.log" />
<appendToFile value="true" />
<lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
<encoding value="utf-8" />
<countDirection value="1" />
<maximumFileSize value="100KB" />
<maxSizeRollBackups value="2" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%utcdate{yyyy-MM-dd HH:mm:ss.ff}Z [%thread]
%-5level %logger [%ndc]%newline %message%newline" />
</layout>
</appender>
<appender name="InfoFile" type="log4net.Appender.RollingFileAppender">
<file value="somepath/info.log" />
<appendToFile value="false" />
<encoding value="utf-8" />
<countDirection value="1" />
<maximumFileSize value="1MB" />
<maxSizeRollBackups value="3" />
<!--<staticLogFileName value="false" />-->
<rollingStyle value="Size" />
<layout type="log4net.Layout.PatternLayout">
<conversionPattern value="%utcdate{yyyy-MM-dd HH:mm:ss.ff}Z [%thread]
%-5level %logger - %message%newline" />
</layout>
</appender>
<root>
<level value="WARN" />
<appender-ref ref="ErrorFile" />
<appender-ref ref="InfoFile" />
</root>
</log4net>
I expected to be able to create an .config file like this to adjust the root
level:
<configuration>
<configSections>
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net update="Merge">
<root>
<level value="DEBUG" />
</root>
</log4net>
</configuration>
However this removes the appenders from the root logger. Using
<configuration>
<configSections>
<section name="log4net"
type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
</configSections>
<log4net update="Merge">
<root>
<level value="DEBUG" />
<appender-ref ref="ErrorFile" />
<appender-ref ref="InfoFile" />
</root>
</log4net>
</configuration>
does not help either:
log4net:ERROR XmlHierarchyConfigurator: No appender named [ErrorFile] could
be found.
log4net:ERROR XmlHierarchyConfigurator: Appender named [ErrorFile] not found.
log4net:ERROR XmlHierarchyConfigurator: No appender named [InfoFile] could be
found.
log4net:ERROR XmlHierarchyConfigurator: Appender named [InfoFile] not found.
I think the purpose of update="Merge" should be to avoid the repetition of
all the lengthy appender definitions in the .config file.
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