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I have a Java Application with this following log4j configuration properties, called log4j-DEV.properties:

################################################################ # Root logger option ############################################################### log4j.rootLogger=ALL, file,stdout ############################################################### ############################################################### # Logger response ############################################################### log4j.logger.response=ALL, proxyLog log4j.additivity.response=false ############################################################### ############################################################# # APPENDER ############################################################# # Direct log messages to a log file log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.File=C:\\log\\application.log log4j.appender.file.Threshold = ALL log4j.appender.file.MaxFileSize=10MB log4j.appender.file.MaxBackupIndex=1 log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n # Direct log messages to stdout log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Threshold = ALL log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n # Direct log messages to a log file log4j.appender.proxyLog=org.apache.log4j.RollingFileAppender log4j.appender.proxyLog.Threshold = ALL log4j.appender.proxyLog.File=C:\\log\\proxyLog.log log4j.appender.proxyLog.MaxFileSize=10MB log4j.appender.proxyLog.MaxBackupIndex=1 log4j.appender.proxyLog.layout=org.apache.log4j.PatternLayout log4j.appender.proxyLog.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n

I use Tomcat as Application Server and I launch it with parameter -Dlog4j.configuration="log4j-DEV.properties"

When application starts, the file C:\log\application.log and C:\log\proxyLog.log are created but are empty although application writes log with instruction:

Log log = LogFactory.getLog(getClass()); log.info("Test log");

What is wrong?

Thanks all

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  • I write the log appender file like: log4j.appender.toFile.File = logs/resourcepie_logfile.html, notice the forward leaning single slash, and i get a log file Commented Apr 26, 2015 at 19:20
  • @svarog I changed the path using forward leaning but the result it's the same: the file is created but it's empty. Commented Apr 26, 2015 at 19:31
  • could you provide a code sample with imports of how you're using the logger ? Commented Apr 26, 2015 at 19:41
  • 1
    I solved the issue changing the code in this way: Logger logger = null; logger = Logger.getRootLogger(); logger.info("TEST"); Commented Apr 26, 2015 at 19:49
  • If you can find out why exactly it works like that, then please post it as an answer. btw, i'm using log manager like: private static final Logger logger = LogManager.getLogger(ClassName.class.getName()); and i'm kind of curious as of why it works Commented Apr 26, 2015 at 19:56

1 Answer 1

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I changed my code from: 

Log log = LogFactory.getLog(getClass()); log.info("Test log");

to

Logger logger = null; logger = Logger.getRootLogger(); logger.info("TEST");

The log4j configuration was fine, I changed the behavior of application in order to use directly log4j classes and now the log appears correctly.

Thanks

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1 Comment

I was using sl4j and it happened to be more hard to use than l4j directly!

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