configure log4j to log to custom file at runtime

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You can also do this from the log4j.properties file. Using the sample file below I have added the system property ${logfile.name}:

# logfile is set to be a RollingFileAppender
log4j.appender.logfile=org.apache.log4j.RollingFileAppender
log4j.appender.logfile.File=${logfile.name}
log4j.appender.logfile.MaxFileSize=10MB
log4j.appender.logfile.layout=org.apache.log4j.PatternLayout
log4j.appender.logfile.layout.ConversionPattern=[%-5p]%d{yyyyMMdd@HH\:mm\:ss,SSS}\:%c - %m%n

The log file name can then be set two different ways:

  1. As a command line, system property passed to java “-Dlogfile.name={logfile}”

  2. In the java program directly by setting a system property (BEFORE you make any calls to log4j).

    System.setProperty(“logfile.name”,”some path/logfile name string”);

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