What is log4j s default log file dumping path

Question

Hi i am new to programming concepts and i am tend to work out something with log4j  So i am reading Log4j tutorials where i found the following code   package test  import org apache log4j Logger  import java io    import java sql SQLException    public class Log4jExample           Get actual class name to be printed on            static Logger log   Logger getLogger Log4jExample class getName             public static void main String   args throws IOException SQLException                       log debug  Hello this is an debug message                log info  Hello this is an info message                   But after running this in eclipse i am not able to locate the generated log file  Can anybody tell where is the file being dumped  Also help me with some best sites wherefrom i can learn Log4j and Java Doc from the scratch  Thanks

User · Answer

By default  Log4j logs to standard output and that means you should be able to see log messages on your Eclipse s console view  To log to a file you need to use a FileAppender explicitly by defining it in a log4j properties file in your classpath   Create the following log4j properties file in your classpath  This allows you to log your message to both a file as well as your console   log4j rootLogger debug  stdout  file  log4j appender stdout org apache log4j ConsoleAppender log4j appender stdout layout org apache log4j PatternLayout    Pattern to output the caller s file name and line number  log4j appender stdout layout ConversionPattern  5p   t    F  L  -  m n  log4j appender file org apache log4j FileAppender log4j appender file File example log log4j appender file layout org apache log4j PatternLayout log4j appender file layout ConversionPattern  p  t  c -  m n   Note  The above creates an example log in your current working directory  i e  Eclipse s project directory  so that the same log4j properties could work with different projects without overwriting each other s logs   References  Apache log4j 1 2 - Short introduction to log4j

User · Answer

You can see the log info in the console view of your IDE if you are not using any log4j properties to generate log file  You can define log4j properties in your project so that those properties would be used to generate log file  A quick sample is listed below     Global logging configuration log4j rootLogger DEBUG  stdout  R    SQL Map logging configuration    log4j logger com ibatis INFO log4j logger com ibatis common jdbc SimpleDataSource INFO log4j logger com ibatis common jdbc ScriptRunner INFO log4j logger com ibatis SQLMap engine impl SQL MapClientDelegate INFO  log4j logger java sql Connection INFO log4j logger java sql Statement DEBUG log4j logger java sql PreparedStatement DEBUG log4j logger java sql ResultSet INFO  log4j logger org apache http ERROR  log4j appender stdout org apache log4j ConsoleAppender log4j appender stdout layout org apache log4j PatternLayout    Pattern to output the caller s file name and line number  log4j appender stdout layout ConversionPattern  5p   t    F  L  -  m n  log4j appender R org apache log4j RollingFileAppender log4j appender R File MyLog log log4j appender R MaxFileSize 50000KB log4j appender R Encoding UTF-8    Keep one backup file log4j appender R MaxBackupIndex 1  log4j appender R layout org apache log4j PatternLayout log4j appender R layout ConversionPattern  d  5p   t    F   L  -  m n

User · Answer

You have copy this sample code from Here right  now  as you can see there property file they have define  have you done same thing  if not then add below code in your project with property file for log4j  So the content of log4j properties file would be as follows     Define the root logger with appender file log    usr home log4j log4j rootLogger   DEBUG  FILE    Define the file appender log4j appender FILE org apache log4j FileAppender log4j appender FILE File   log  log out    Define the layout for file appender log4j appender FILE layout org apache log4j PatternLayout log4j appender FILE layout conversionPattern  m n   make changes as per your requirement like log path

User · Answer

To redirect your logs output to a file  you need to use the FileAppender and need to define other file details in your log4j properties xml file  Here is a sample properties file for the same     Root logger option log4j rootLogger INFO  file    Direct log messages to a log file log4j appender file org apache log4j RollingFileAppender log4j appender file File C   loging log log4j appender file MaxFileSize 1MB 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   Follow this tutorial to learn more about log4j usage   http   www mkyong com logging log4j-log4j-properties-examples

[java] What is log4j's default log file dumping path

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