log4j logging twice

Question

I am using log4j to log error and other system information. but come of the info logged twice at INFO level.

public static void main(final String... args) throws         


        

Answer 1

Just simply add

logger.setadditivity(false);

to your code (Reference).

We are having double results in the console, it's because appenders are not singletons, they are additive. Meaning, a category inherits all the appenders from its ancestors (by default). If we add an appender to a category and it writes to the same underlying stream (console, same file etc.) as some other appender, the same log message will appear twice (or more) in the log. In addition, if two categories in a hierarchy are configured to use the same appender name, Log4j will write twice to that appender. Configured for that category