Internal Debugging

Because Log4cxx is a logging library, we can't use it to output errors from the library itself. There are several ways to activate internal logging:

1. Configure the library directly by calling the LogLog::setInternalDebugging method
2. If using a properties file, set the value log4j.debug=true in your configuration file
3. If using an XML file, set the attribute internalDebug=true in the root node
4. From the environment: LOG4CXX_DEBUG=true

All error and warning messages are sent to stderr.