Question

I’m using apache commons library and log4j.
I have an xml configuration file and a log4j.properties files. I want to specify my log4j properties path inside my xml configuration file.
To load my settings i do:

//Loading my xml file
this.config = new XMLConfiguration(this.xmlFileName);  

At this moment the following warnings are raised:

log4j:WARN No appenders could be found for logger (org.apache.commons.configuration.ConfigurationUtils).
log4j:WARN Please initialize the log4j system properly.
log4j:WARN See http://logging.apache.org/log4j/1.2/faq.html#noconfig for more info.

However i haven’t yet called any log4j object. Once i have read the xml file i can successfully work with my log4j instance.
Is there any way to remove those warnings?

Answer 1

Log4J outputs this error when a logger is created, but no appender(s) is(are) defined.
In practice this error occurs when a logger is created before log4j is initialized.

You say you haven’t called any log4j object. But in the error message you see that org.apache.commons.configuration.ConfigurationUtils creates a logger object (see line 66).

You could turn it off before initialization, see How to turn off log4j warnings?

Logger.getRootLogger().setLevel(Level.OFF);

There should be no need to turn it on again since the initialization sets normally the log level of the root logger.