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I'm using Apache Commons Logging and SLF4J with log4j, but I also want to use the log4j.properties in a custom place like conf/log4.properties. Here is the problem:
If i use
PropertyConfigurator.configure("conf/log4j.properties");
then my app is tied to log4j and defeats the purpose of having ACL and SLF4J.
What is the best way to configure it without the app ever knowing what the logging implementation is?
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The file is named log4j. properties and is located in the $DGRAPH_HOME/dgraph-hdfs-agent/lib directory. The file defines the ROLLINGFILE appenders for the root logger and also sets the log level for the file. The level of the root logger is defined as INFO and attaches the ROLLINGFILE appender to it.
This is not mandatory. Root logger does not have a default appender attached and it can exist without an appender. So, your log4j properties file can be without this property being set.
Use LogManager. resetConfiguration(); to clear the current config and configure it again. Another approach is to build a new appender and replace the old one with it (most appenders don't support changing their config). This way, all the loggers (and their levels, etc) stay intact.
I think the easiest thing to do is specify the location of the file using the log4j.configuration system property. Adopting the example in the Log4J manual:
java -Dlog4j.configuration=conf/log4j.properties -classpath ...
I believe that Log4J will find a file named "log4j.properties" anywhere on the classpath, but may be hallucinating. Worth trying, however.
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