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Editorial Team
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Asked: 2026-06-01T23:58:49+00:00

I have below settings for log4j.properties. But all log text whether info,debug,exception,fatal goes to

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I have below settings for log4j.properties. But all log text whether info,debug,exception,fatal goes to MyDebugFile. No file prefixed with exception is created.
My question are:

  1. Can I mention same file for log4j.appender.EXCEPTION_LOG_FILE and log4j.appender.DEBUG_LOG_FILE
  2. What does property log4j.appender.EXCEPTION_LOG_FILE.Threshold specify?
  3. Why is the file prefixed with exception is not created?

Set up the format for messages logged to the Exception log file.

 log4j.appender.EXCEPTION_LOG_FILE=biz.minaret.log4j.DatedFileAppender
 log4j.appender.EXCEPTION_LOG_FILE.Threshold=INFO
 log4j.appender.EXCEPTION_LOG_FILE.Directory=C:/log/
 log4j.appender.EXCEPTION_LOG_FILE.Prefix=exception.
 log4j.appender.EXCEPTION_LOG_FILE.Suffix=.log
 log4j.appender.EXCEPTION_LOG_FILE.layout=org.apache.log4j.PatternLayout
 log4j.appender.EXCEPTION_LOG_FILE.layout.ConversionPattern=%d [%t] %-5p %c{3} - %m%n
 log4j.appender.EXCEPTION_LOG_FILE.MaxFileSize=100KB
 log4j.appender.EXCEPTION_LOG_FILE.MaxBackupIndex=4

Set up the format for messages logged to the debug log file.

 log4j.appender.DEBUG_LOG_FILE=biz.minaret.log4j.DatedFileAppender
 log4j.appender.DEBUG_LOG_FILE.Directory=C:/log/
 log4j.appender.DEBUG_LOG_FILE.Prefix=MyDebugFile.
 log4j.appender.DEBUG_LOG_FILE.Suffix=.log
 log4j.appender.DEBUG_LOG_FILE.layout=org.apache.log4j.PatternLayout
 log4j.appender.DEBUG_LOG_FILE.layout.ConversionPattern=%d [%t] %-5p %c{3} - %m%n
 log4j.appender.DEBUG_LOG_FILE.MaxFileSize=100KB
 log4j.appender.DEBUG_LOG_FILE.MaxBackupIndex=4
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1 Answer

  1. Editorial Team
    1. Can I mention same file for log4j.appender.EXCEPTION_LOG_FILE and
      log4j.appender.DEBUG_LOG_FILE

    –> I don’t think log4j really supports two appenders writing to the same file because of synchronization issues.

    2 . What does property log4j.appender.EXCEPTION_LOG_FILE.Threshold
    specify?

    –> Read an article here.

    3 . Why is the file prefixed with exception is not created?

    –> For this I don’t have any idea.

    This should help you

    log4j.rootLogger=EXCEPTION_LOG_FILE, DEBUG_LOG_FILE

    setup A1

    log4j.appender.EXCEPTION_LOG_FILE=org.apache.log4j.RollingFileAppender
    log4j.appender.EXCEPTION_LOG_FILE.Threshold=INFO
    log4j.appender.EXCEPTION_LOG_FILE.File=exception.log
    …

    setup A2

    log4j.appender.DEBUG_LOG_FILE=org.apache.log4j.RollingFileAppender
    log4j.appender.DEBUG_LOG_FILE.Threshold=DEBUG
    log4j.appender.DEBUG_LOG_FILE.File=MyDebugFile.log

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