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面试准备

Log4j 面试题与答案

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

The WARN log level designates potentially harmful situations.

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问题 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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问题 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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