How to enable Logger.debug() in Log4j

Question

While trying to execute the following lines only the last two statements are displayed("Here is some ERROR" and "Here is some FATAL") and the first three statements are not displayed.I had just started to learn this topic, can anyone tell why is this happening?

    logger.debug("Here is some DEBUG");
    logger.info("Here is some INFO");
    logger.warn("Here is some WARN");
    logger.error("Here is some ERROR");
    logger.fatal("Here is some FATAL");

the log4j.property has

log4j.rootLogger=debug,stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=[%5p] %d{mm:ss}(%F:%M:%L)%n%m%n%n

Answer 1

You need to set the logger level to the lowest you want to display. For example, if you want to display DEBUG messages, you need to set the logger level to DEBUG.

The Apache log4j manual has a section on Configuration.

Answer 2

This is happening due to the fact that the logging level of your logger is set to 'error' - therefore you will only see error messages or above this level in terms of severity so this is why you also see the 'fatal' message.

If you set the logging level to 'debug' on your logger in your log4j.xml you should see all messages.

Have a look at the log4j introduction for explaination.