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I have an RollingFile Appender defined in my log4j2.xml.
<RollingFile name="RollingFile" fileName="/logs/app.log"
filePattern="logs/$${date:yyyy-MM}/app-%d{MM-dd-yyyy}-%i.log.gz">
<PatternLayout>
<Pattern>%d{HH:mm:ss.SSS} - %-5p - %m - [%l]%n</Pattern>
</PatternLayout>
<Policies>
<TimeBasedTriggeringPolicy />
<SizeBasedTriggeringPolicy size="10 MB" />
</Policies>
<DefaultRolloverStrategy max="20" />
</RollingFile>
What I want to do is to pass this parameter to the JVM at startup:
-Dapp_home=/home/admin/server
The documentation is pretty straight forward. And from what I understand it should work like this:
<RollingFile name="RollingFile" fileName="${jvmrunargs:app_home}/logs/app.log"
But it doesn't. I verified that it is working in general by using the absolut path.
In an other application where I use log4j (1.x) it works like this:
log4j.appender.file.File=${app_home}/logs/app.log
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Configuration: the root element of a log4j2 configuration file; the status attribute represents the level at which internal log4j events should be logged. Appenders: this element contains a list of appenders; in our example, an appender corresponding to the System console is defined.
public class MyClass { static { try { InputStream inputStream = new FileInputStream("C:/path/to/log4j2. xml"); ConfigurationSource source = new ConfigurationSource(inputStream); Configurator. initialize(null, source); } catch (Exception ex) { // Handle here } } private static final Logger LOGGER = LoggerFactory.
Take a look at the System Properties Lookup section of the documentation. If you define a variable as system property using -D like this:
-Dapp_home=/home/admin/server
use
${sys:app_home}
in your Log4j 2 configuration to access it.
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