TRACE log level

Question

I know following log levels in Log4J:

ALL < DEBUG < INFO < WARN < ERROR < FATAL < OFF

But in some samplers I found TRACE

and trace() metod:

Logger LOG = Logger.getLogger(MyClass.class);
LOG.trace("Instance created of AnotherClass");

In my IDE method trace() is not recognizable. Is this old Log4J library and TRACE appears only in some new one?

Answer 1

The org.apache.log4j.Level.TRACE level was added to log4j in the version 1.2.12

You need to update the version of your log4j's library.

Answer 2

Log4j itself does not have the TRACE level. That log level is provided by the newer logging facades like commons-logging or slf4j. These facades itself do not log but delegate to underlying logging providers like log4j or logback.