Please initialize the log4j system properly warning

Question

Here is the error message -  log4j WARN No appenders could be found for logger  SerialPortUtil   log4j WARN Please initialize the log4j system properly  log4j WARN See http   logging apache org log4j 1 2 faq html noconfig for more info    Here is the invocation in the SerialPortUtil class -  private static final Logger log   Logger getLogger SerialPortUtil class getSimpleName           log info  Serial port     port getName       is available      Here is the content of my log4j properties file -  log4j rootLogger DebugAppender   Debug logging log4j appender DebugAppender org apache log4j RollingFileAppender log4j appender DebugAppender Threshold DEBUG log4j appender DebugAppender File activityLog log log4j appender DebugAppender MaxFileSize 200KB log4j appender DebugAppender MaxBackupIndex 5 log4j appender DebugAppender layout org apache log4j PatternLayout log4j appender DebugAppender layout ConversionPattern  d DATE   t -  m n   And the property file is on the classpath   Everything looks right to me  so what s going on  Shouldn t the DEBUG threshold also capture INFO logging

User · Answer

If you are encountering the error warning when you re running a program that uses log4j  the solution is to add a log4j properties that can be seen by the class loader  Normally it s in the  src  folder of your Java project  Add the following contents to the file  log4j rootLogger INFO  stdout  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 ABSOLUTE   5p  c 1   L -  m n

User · Answer

None of answered method solve the problem which log4j properties file is not found for non-maven jsf web project in NetBeans  So the answer is   Create a folder named resources in project root folder  outermost folder   Right click project in projects explorer in left menu  select properties  Open Sources in Categories  add that folder in Source Package Folders  Open Run in Categories and add this to VM options  Dlog4j configuration resources log4j properties Click Ok  build and deploy project as you like  that s it   I wrote special pattern in log4j file to check whether log4j is used my file    Root Logger Option log4j rootLogger INFO  console    Redirect Log Messages To Console log4j appender console org apache log4j ConsoleAppender log4j appender console Target System out log4j appender console layout org apache log4j PatternLayout log4j appender console layout ConversionPattern  -5p    d yyyy-MM-dd HH mm ss      t   C 2  xxxx   F  L  -  m n  I checked it because if you use BasicConfigurator configure    in your code in log4j use predefined pattern

User · Answer

Add  the code    BasicConfigurator configure      in your  static main class as below    Note   add    hadoop-2 7 1 share hadoop common lib commons-logging-1 1 3 jar    amp    hadoop-2 7 1 share hadoop common lib log4j-1 2 17 jar    as the external references  import org apache log4j BasicConfigurator   public class ViewCountDriver extends Configured implements Tool       public static void main String  args  throws Exception           BasicConfigurator configure              int exitcode   ToolRunner run new ViewCountDriver    args           System exit exitcode

User · Answer

What worked for me is to create a log4j properties file  you can find many examples over the net  and place it in properties folder in your project directory  create this folder if not exicts   The right click on the folder and Build Path- gt Use as Source Folder      Hope it helps

User · Answer

This work for me   public static void main String   args             Properties props   new Properties            props load new FileInputStream  src log4j properties             PropertyConfigurator configure props

User · Answer

From the link in the error message      This occurs when the default configuration files log4j properties and log4j xml can not be found and the application performs no explicit configuration  log4j uses Thread getContextClassLoader   getResource   to locate the default configuration files and does not directly check the file system  Knowing the appropriate location to place log4j properties or log4j xml requires understanding the search strategy of the class loader in use  log4j does not provide a default configuration since output to the console or to the file system may be prohibited in some environments  Also see FAQ  Why can t log4j find my properties in a J2EE or WAR application     The configuration file cannot be found  Are you using xml or a property file    Also  use logback

User · Answer

Try doing something like the following in main   public static void main String   args         PropertyConfigurator configure args 0              your code   you need to tell log4j what its configuration should be

User · Answer

To add to  Gevorg  if you have a similar situation running Spark locally  place the log4j properties file in the folder named resources under the main folder

User · Answer

Alright  so I got it working by changing this  log4j rootLogger DebugAppender   to this  log4j rootLogger DEBUG  DebugAppender   Apparently you have to specify the logging level to the rootLogger first  I apologize if I wasted anyone s time   Also  I decided to answer my own question because this wasn t a classpath issue

User · Answer

just configure your log4j property file path in beginning of main method  e g   PropertyConfigurator configure  D  files log4j properties

User · Answer

The fix for me was to put  log4j properties  into the  src  folder   It did not work in my package folder it has to be one up at the very root of source   Adding it to the build path which then moves it to the  Reference Libraries  also did not work     To repeat  put log4j properties at the root of your src folder   my log4j properties files has the following content which works on the latest version of Spring Tool Suite which is based on Eclipse     Configure logging for testing  optionally with log file  log4j rootLogger INFO  stdout log4j rootLogger WARN  stdout  logfile  log4j appender stdout org apache log4j ConsoleAppender log4j appender stdout layout org apache log4j PatternLayout log4j appender stdout layout ConversionPattern  d  p   c  -  m n  log4j appender logfile org apache log4j FileAppender log4j appender logfile File target spring log log4j appender logfile layout org apache log4j PatternLayout log4j appender logfile layout ConversionPattern  d  p   c  -  m

[java] Please initialize the log4j system properly warning

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