Please initialize the log4j system properly While running web service

Question

Maybe it looks silly to ask this but I am confused  I referred to Configuring Log4j property but it doesn t seem to help   I have written a simple web service HelloWorld  And while running it I am getting the error something like this        log4j WARN No appenders could be found for logger  org apache axis transport http AxisServlet     log4j WARN Please initialize the log4j system properly    I am not sure why its happening    I am generating the web-service using Eclipse and deployed in Tomcat 6 0  I check on Axis Developer s Guide and according to them      log4j configuration log4j properties   Use this system property to specify the name of a Log4J configuration file  If not specified  the default configuration file is log4j properties  A log4j properties file is provided in axis jar    I didn t find log4j properties in the axis jar   Any help on this

User · Answer

Well  if you had already created the log4j properties you would add its path to the classpath so it would be found during execution  Yes  the thingy will search for this file in the classpath  Since you said you looked into axis and didnt find one  I am assuming you dont have a log4j properties  so here s a crude but complete example   Create it somewhere and add to your classpath  Put it for example  in c  proj resources log4j properties In your classpath you simple add         c  proj resources    Root logger option log4j rootLogger DEBUG  stdout  file    Redirect log messages to console log4j appender stdout org apache log4j ConsoleAppender 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    Redirect log messages to a log file  support file rolling  log4j appender file org apache log4j RollingFileAppender log4j appender file File c  project resources t-output log4j-application log log4j appender file MaxFileSize 5MB log4j appender file MaxBackupIndex 10 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

User · Answer

If the below statment is present in your class then your log4j properties should be in java source src  folder   if it is jar executable it should be packed in jar not a seperate file    static Logger log   Logger getLogger MyClass class     Thanks

User · Answer

Warning No appenders could be found for logger means that you re using log4j logging system  but you haven t added any Appenders  such as FileAppender  ConsoleAppender  SocketAppender  SyslogAppender  etc   into your configuration file or the configuration file is missing   There are three ways to configure log4j  with a properties file  log4j properties   with an XML file and through Java code  rootLogger addAppender new NullAppender        If you ve property file present  e g  when installing Solr   you need to place this file within your classpath directory   classpath  Here are some command suggestions how to determine your classpath value     echo  CLASSPATH   ps wuax   grep -i classpath   grep -Ri classpath  etc tomcat   var lib tomcat  conf   or from Java  System getProperty  java class path     Tomcat  If you re using Tomcat  you may place your log4j properties into   usr share tomcat  lib  or  var lib tomcat  webapps   WEB-INF lib  folder   Solr  For the reference  Solr log4j properties looks like      Logging level solr log logs  log4j rootLogger INFO  file  CONSOLE  log4j appender CONSOLE org apache log4j ConsoleAppender  log4j appender CONSOLE layout org apache log4j PatternLayout log4j appender CONSOLE layout ConversionPattern  -4r   t   -5p  c  x  u2013  m n   - size rotation with log cleanup  log4j appender file org apache log4j RollingFileAppender log4j appender file MaxFileSize 4MB log4j appender file MaxBackupIndex 9   - File to log to and log format log4j appender file File   solr log  solr log log4j appender file layout org apache log4j PatternLayout log4j appender file layout ConversionPattern  -5p -  d yyyy-MM-dd HH mm ss SSS    C   m n  log4j logger org apache zookeeper WARN log4j logger org apache hadoop WARN    set to INFO to enable infostream log messages log4j logger org apache solr update LoggingInfoStream OFF

User · Answer

Those messages are something tricky  enough so that people created this to make it clearer  https   issues apache org bugzilla show bug cgi id 25747  What s tricky about them is that the warnings are written if Log4j can t find its log4j properties  or log4j xml  file  but also if the file is fine and dandy but its content is not complete from a configuration point of view   The following paragraph is taken from here  http   svn apache org repos asf logging log4j tags v1 2 9 docs TROUBLESHOOT html  Logging output is written to a target by using an appender  If no appenders are attached to a category nor to any of its ancestors  you will get the following message when trying to log   log4j  No appenders could be found for category  some category name   log4j  Please initialize the log4j system properly    Log4j does not have a default logging target  It is the user s responsibility to ensure that all categories can inherit an appender  This can be easily achieved by attaching an appender to the root category   You can find info on how to configure the root logger  log4j rootLogger  in the log4j documentation  basically adding something as simple as this at the beginning of the file    log4j rootLogger debug  stdout log4j appender stdout org apache log4j ConsoleAppender log4j appender stdout layout org apache log4j PatternLayout log4j appender stdout layout ConversionPattern  -4r   t   -5p  c  x -  m n   This should clear those WARN messages you get on startup  make sure you don t already have an appender named stdout  also be carefull of what level you give the root logger  debug will be very verbose and every library in your app will start writing stuff to the console    As about the log4j properties log4j xml  I suggest you place this file in  WEB-INF classes as it is important to have it exposed for different tweaks  activating deactivating logs  changing log levels etc   You can have it inside a JAR in the classpath also  as you specified in your comment   but it will be enclosed in the archive  hopefully in the right place inside the archive  and won t be as easy to handle as if it were in  WEB-INF classes

User · Answer

You can configure log4j properties like above answers  or use org apache log4j BasicConfigurator  public class FooImpl implements Foo        private static final Logger LOGGER   Logger getLogger FooBar class        public Object createObject             BasicConfigurator configure            LOGGER info  something            return new Object              So under the table  configure do     configure         Logger root   Logger getRootLogger        root addAppender new ConsoleAppender             new PatternLayout PatternLayout TTCC CONVERSION PATTERN

User · Answer

You have to create your own log4j properties in the classpath folder

User · Answer

If you are using  Logger getLogger ClassName class  then place your log4j properties file in your class path    yourproject javaresoures src log4j properties  Put inside src folder

[java] Please initialize the log4j system properly. While running web service

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