No appenders could be found for logger(log4j)?

Question

I have put log4j to my buildpath, but I get the following message when I run my application:

log4j:WARN No appenders could be found for logger (dao.hsqlmanag         


        

Answer 1

The reason can be lack of the word static in some:

final static Logger logging = Logger.getLogger(ProcessorTest.class);

If I make logger the instance field, I am getting exactly this very warning:

No appenders could be found for logger (org.apache.kafka.producer.Sender)

What is worse, the warning points not to ProcessorTest, where the mistake lives, but to an absolutely different class (Sender) as a source of problems. That class has correct set logger and need not any changes! We could look for the problem for ages!