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Log4j - Interview Questions and Answers for 'Log4j level' - 3 question(s) found - Order By Newest

 Q1. What are some different logging levels for log4j ?Log4j
Ans. DEBUG
ERROR
ALL
WARN
INFO
FATAL
OFF
TRACE
TRACE_INT
WARN

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Related Questions
 Can you organize following Log4j levels in hierarchy ?

WARN, DEBUG,INFO, ERROR
 What is the difference between INFO and DEBUG logging levels ?

 Q2. Can you organize following Log4j levels in hierarchy ?

WARN, DEBUG,INFO, ERROR		Log4j
Ans. DEBUG
INFO
WARN
ERROR

Root Log level of DEBUG will print all
Root Log Level of INFO will print INFO, WARN and ERROR
Root Log level of WARN will print WARN and ERROR
Root Log level of ERROR will print ERROR alone

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   Like         Discuss         Correct / Improve     Log4j levels hierarchy  Log4j

Related Questions
  What are some different logging levels for log4j ?
 How will you design a Log4j kind of framework.
 What is the difference between log4j and java logging api.
 What is the difference between TimeBasedRollingPolicy and SizeBasedTriggeringPolicy within Log4j ? Can we use both together and What would that mean ?
 What is the difference between RollingFile and RollingRandomAccessFile in log4j ?
 In following log4j configuration file, How should we change the logging level to WARN

<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
      <TimeBasedTriggeringPolicy />
   </RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
 in the following log4j config file, How should we change the file name and format


<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
      <TimeBasedTriggeringPolicy />
   </RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
 In the following log4j config, What if we don't need rolling logs

<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
      <TimeBasedTriggeringPolicy />
   </RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
 What are some of the Log4j appenders ?

 Q3. What is the difference between INFO and DEBUG logging levels ?Log4j
Ans. Info Messages are something which we would like to see even if the application is in best of state. DEBUG messages are usually something that we would like to see while debugging some problem. DEBUG is lower level than Info. Any message logged with info gets printed if the Root level set is DEBUG.

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   Like         Discuss         Correct / Improve     Log4j  Log4j levels

Related Questions
  What are some different logging levels for log4j ?
 How will you design a Log4j kind of framework.
 What is the difference between log4j and java logging api.
 What is the difference between TimeBasedRollingPolicy and SizeBasedTriggeringPolicy within Log4j ? Can we use both together and What would that mean ?
 What is the difference between RollingFile and RollingRandomAccessFile in log4j ?
 In following log4j configuration file, How should we change the logging level to WARN

<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
      <TimeBasedTriggeringPolicy />
   </RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
 in the following log4j config file, How should we change the file name and format


<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
      <TimeBasedTriggeringPolicy />
   </RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
 In the following log4j config, What if we don't need rolling logs

<Configuration status="DEBUG">
<Appenders>
<RollingFile name="File" fileName="logs/xyz.log" filePattern="logs/xyz-%d{MM-dd-yyyy}.log.gz">
      <TimeBasedTriggeringPolicy />
   </RollingFile>
</Appenders>
<Loggers>
<Root level="DEBUG">
<AppenderRef ref="File" />
</Root>
</Loggers>
</Configuration>
 What are some of the Log4j appenders ?
 Can you organize following Log4j levels in hierarchy ?

WARN, DEBUG,INFO, ERROR

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