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Log4j 면접 질문과 답변

Ques 16. What is the purpose of the OFF log level?

The OFF log level is the highest possible rank and is intended to turn off logging.

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Ques 17. What is the purpose of the TRACE log level?

The TRACE log level designates finer-grained informational events than the DEBUG.

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Ques 18. What is the purpose of the WARN log level?

The WARN log level designates potentially harmful situations.

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Ques 19. How do Log Levels work or tell the log level hierarchy?

A log request of level p in a logger with level q is enabled if p >= q. This rule is at the heart of log4j. It assumes that levels are ordered. For the standard levels, we have ALL < DEBUG < INFO < WARN < ERROR < FATAL < OFF.

For example: if the log level is mentioned as 'WARN' in the log4j properties. Then the logs will be coming in the log file are: WARN, ERROR, FATAL

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Ques 20. What are different appenders that can configure in log4j?

There are different appenders that we can configure in log4j are: CONSOLE, FILES, DATABASE, JMS, EVENT LOGGING.

Mainly used appenders:

CONSOLE in log4j:- If we use this as appenders in your application, log4j logs the information in the console or command prompt window that is started with startup script.
Files in log4j:- Files Appender is used to log the information into our custom name files. when we are configuring this appender, we can specify the file name.

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