This example uses a timer to generate interrupt at a specific period. The timer event handler increments the event count and prints in stdout.

# Set root logger level to DEBUG and its only appender to A1. log4j.rootLogger=DEBUG, A1 # A1 is set to be a ConsoleAppender. log4j.appender.A1=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out