Ques 26. What are the system properties checked by log4j?
The system properties checked by log4j are
Log4j debug, if true, log4j will show internal debugging messages to the console
defaultInitOverride, if true, log4j will not execute default initialization
configuration, URL for default initialization configuration file
configurationClass, Class name for configurator to execute default initialization configuration file
ignoreTCL, if true, the thread class loader will be overlooked when loading classes
Is it helpful?
Add CommentView Comments
Ques 27. What is the role of the filter in log4j?
Filter objects in log4j decide whether logging requests should be handled by a particular Appender or ignored.
Is it helpful?
Add CommentView Comments
Ques 28. How can you get multiple processes to log into the same file?
You may have each process log to a socket Appender. The receiving socket server can receive all the events and send them to a single log file.
Is it helpful?
Add CommentView Comments
Ques 29. What is the difference between Threshold and LevelRangeFilter in log4j?
Both Threshold and LevelRangeFilter do the same thing.
However, the threshold should be faster. Filters enable you to implement your own logic, and you can also link them together if required. If you need a basic threshold functionality, then the “threshold” function will be enough.
Is it helpful?
Add CommentView Comments
Ques 30. Explain what does WARN and TRACE level indicates in log4j?
Log4j level WARN gives a warning about an unpredicted event to the user. The messages coming out of this level may not stop the progress of the system.
The TRACE level provides more detailed information than the DEBUG level, and it will stay at the top of the hierarchy.