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Log4j refers to a file of external properties in the class path

I have a log4j.properties file

log4j.appender.BigBrotherLog=org.apache.log4j.RollingFileAppender log4j.appender.BigBrotherLog.File=${userprofile.broker.bigbrother.log4j.file.path} log4j.appender.BigBrotherLog.MaxFileSize=100MB log4j.appender.BigBrotherLog.MaxBackupIndex=10 log4j.appender.BigBrotherLog.layout=org.apache.log4j.PatternLayout log4j.appender.BigBrotherLog.layout.ConversionPattern=%d{yy/MM/dd} %d{HH:mm:ss} ALARM CRITICAL SITA ESB (SOAESB) [%-t] (%F:%L) %-5p %-c{1} %x- %m%n log4j.appender.BigBrotherLog.Threshold=FATAL

where I pass the file $ {userprofile.broker.bigbrother.log4j.file.path} from the external properties file. But I want to place this external properties file in the class path. How can I make it work? Thanks.

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When calling the java command, go to the system property -Dlog4j.configuration=file:[path-to-your-external-file] . The important part is file: otherwise log4j will try to load only from the class path and system resources.

You can also use -Dlog4j.debug=true to see where log4j tried to pass its configuration file.

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