Environment Variables {#environment-variables}
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# Environment Variables Used by Log4cxx

There are several environment variables that can be set in order to influence how
Log4cxx works.  They are summarized in the following table:


| Environment Variable | Usage |
| -------------------- | ----- |
| LOG4CXX\_DEBUG       | Set to the value 'true' to enable internal debugging of Log4cxx.  All output goes to stderr.  This can be useful to determine why a configuration file is not loading |
| log4j.configuratorClass | Used to determine what class to use to configure the logging system |
| LOG4CXX\_CONFIGURATOR\_CLASS | Used to determine what class to use to configure the logging system.  Takes precedence over log4j.configuratorClass |
| log4j.configuration | Set the file to load to configure the logging system |
| LOG4CXX\_CONFIGURATION | Set the file to load to configure the logging system.  Takes precedence over log4j.configuration |
| LOG4CXX\_CONFIGURATION\_WATCH\_SECONDS | Set how often the configuration file should be checked for changes |

