Question: What are the system properties checked by log4j?

The system properties checked by log4j are

• Log4j debug, if true, log4j will show internal debugging messages to the console
• defaultInitOverride, if true, log4j will not execute default initialization
• configuration, URL for default initialization configuration file
• configurationClass, Class name for configurator to execute default initialization configuration file
• ignoreTCL, if true, the thread class loader will be overlooked when loading classes