... and I'm not aware of any capability in XML configuration files to set
system properties.
Yes, exactly this is my main question (How to set a property, which can be
referenced in the xml config elsewhere? It works in flat log4j text config
files) - it's still open. Unfortunately I didn't even found a hint about it
in the link http://wiki.apache.org/logging-log4j/Log4jXmlFormat.
Thomas Wiedmann
On Feb 21, 2011, at 8:05 PM, Jacob Kjome wrote:
Curt,
Maybe I'm missing something, but how does using XML entity refs do
anything for
referencing Java system properties? The simple answer is that Log4j XML
config
files support exactly the same syntax as properties files, e.g.,....
<param name="File" value="${log4j.logdir}/MyAppender1.log"/>
I don't recall whether/where it's specifically documented or not, but it
works.
Jake
On 2/20/2011 10:30 PM, Curt Arnold wrote:
XML entity references can be used for that purpose and are defined in the
XML Recommendation (http://www.w3.org/TR/xml/#sec-references).
<!DOCTYPE log4j:configuration
[
<!ENTITY logdir "c:/data/logfiles">
]>
<log4j:configuration>
...
<param name="file" value="&logdir;"/>
...
</log4j:configuration>
On Feb 20, 2011, at 6:35 AM, Thomas Wiedmann wrote:
Hello,
usually in flat plain text log4j.config files global system properties
can be defined, which may be referenced in the configuration of
different appenders, e. g.
log4j.logdir=C:/Data/logfiles
...
log4j.appender.MyAppender1.File=${log4j.logdir}/MyAppender1.log
...
log4j.appender.MyAppender2.File=${log4j.logdir}/MyAppender2.log
I found this is a very convenient way to define (and to administer) such
parameters only once globally for the entire log configuration and to
use it on several references as here in the appenders configuration.
How can such global system properties be defined in xml-based
configuration files (log4j.xml)?
Where is it documented? I'd found no hint about it.
Thomas Wiedmann
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