{"id":4390,"date":"2018-05-07T18:37:52","date_gmt":"2018-05-07T13:07:52","guid":{"rendered":"https:\/\/www.innovationm.com\/blog\/?p=4390"},"modified":"2023-01-20T18:55:44","modified_gmt":"2023-01-20T13:25:44","slug":"logging-with-log4j-in-java","status":"publish","type":"post","link":"https:\/\/www.innovationm.com\/blog\/logging-with-log4j-in-java\/","title":{"rendered":"Logging with Log4j in JAVA"},"content":{"rendered":"

Why we use Log4j ?<\/span><\/p>\n

Log4j \u00a0is used for logging. Logging is the process of writing log message in any file, db,console etc( any central place).<\/span><\/p>\n

If we use SOP \u00a0(System.out.print() ) statement to print the log message then we can have some disadvantage :<\/span><\/p>\n

1. We can print log message on console only. So when console is closed , we will lose all logs.<\/span><\/p>\n

2.We can\u2019t store log message at any permanent place. These message will print one by one on console because it is single threaded environment.<\/span><\/p>\n

To overcome these problems Log4j framework came into the picture.Log4j is an open source framework provided by Apache <\/span>for only java projects.<\/span><\/p>\n

Log4j Components:<\/b><\/h3>\n

Log4J have three components mainly which are following :<\/span><\/p>\n

    \n
  1. Logger<\/span><\/li>\n
  2. Appender<\/span><\/li>\n
  3. Layout<\/span><\/li>\n<\/ol>\n
      \n
    • \n

      Logger <\/b><\/h3>\n<\/li>\n<\/ul>\n

      Logger \u00a0is a class in <\/span>org.apache.log4j.*\u00a0<\/span><\/i> package. we have to initialize one Logger object for each java class. We use Logger\u2019s methods to generate log statements. Log4j provide the factory method to get Logger object.<\/span><\/p>\n

      Syntax to get Logger object :<\/span><\/p>\n

      static Logger logger = Logger.getLogger(CurrentClass.class.getName()).<\/pre>\n
      Note: <\/span>CurrentClass <\/span><\/i>is a java class name for which we are getting logger object.<\/span><\/p>\n
      Example<\/b><\/h3>\n
      public class Student{\r\n\r\n\u00a0private static final Logger LOGGER = Logger.getLogger(Student.class);\r\n\u00a0\u00a0\u00a0public void getStudentRecord() {\r\n\u00a0\u00a0}\r\n}<\/pre>\n
      Logger class has some method which are used to print the application status.<\/span><\/p>\n
      We have totally five methods in Logger class<\/span><\/p>\n
        \n
      1. info()<\/span><\/li>\n
      2. debug()<\/span><\/li>\n
      3. warn()<\/span><\/li>\n
      4. fatal()<\/span><\/li>\n
      5. error()<\/span><\/li>\n<\/ol>\n
        It depends on us how to use and when to use these methods. Here methods name are different but working is same of all. All will print a message only.<\/span><\/p>\n
        Levels\u00a0<\/b><\/h3>\n
        Level is a<\/span> class in <\/span>org.apache.log4j.* package<\/span>. We can also make custom level by extending Level class. Each level has a different priority order like this :<\/span><\/p>\n
        debug < info < warn < error < fatal<\/span><\/p>\n
        It means fatal is the highest priority error like database closed. <\/span><\/p>\n
        \u00a0Appender <\/b><\/h3>\n
        Appender is used to write the message into the file or db or smtp.<\/span><\/p>\n
        Log4j have different type of appender:<\/span><\/p>\n
          \n
        1. SyslogAppendersends<\/span><\/li>\n
        2. SMTPAppender <\/span><\/li>\n
        3. JDBCAppender <\/span><\/li>\n
        4. FileAppender <\/span><\/li>\n
        5. SocketHubAppender<\/span><\/li>\n
        6. SocketAppender <\/span><\/li>\n
        7. TelnetAppender<\/span><\/li>\n
        8. ConsoleAppender<\/span><\/li>\n<\/ol>\n
          \u00a0Layout<\/b><\/h3>\n
          This is used to define the formatting in which logs will print in repository.<\/span><\/p>\n
          We have different types of layout:<\/span><\/p>\n
            \n
          1. PatternLayout<\/span><\/li>\n
          2. SimpleLayout<\/span><\/li>\n
          3. XMLLayout<\/span><\/li>\n
          4. HTMLLayout<\/span><\/li>\n<\/ol>\n
            log4j – Configuration<\/strong><\/h2>\n
            log4j.properties<\/b><\/h3>\n
            # Root logger option\r\nlog4j.rootLogger=INFO, file, stdout\r\n\r\n# configuration to print into file\r\nlog4j.appender.file=org.apache.log4j.RollingFileAppender\r\nlog4j.appender.file.File=D:\\\\log\\\\logging.log\r\nlog4j.appender.file.MaxFileSize=12MB\r\nlog4j.appender.file.MaxBackupIndex=10\r\nlog4j.appender.file.layout=org.apache.log4j.PatternLayout\r\nlog4j.appender.file.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n\r\n\r\n# configuration to print on console\r\nlog4j.appender.stdout=org.apache.log4j.ConsoleAppender\r\nlog4j.appender.stdout.Target=System.out\r\nlog4j.appender.stdout.layout=org.apache.log4j.PatternLayout\r\nlog4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1}:%L - %m%n\r\n\r\n<\/pre>\n
             <\/p>\n
            Description of log4j.properties file :<\/b><\/p>\n
            log4j.appender.<\/span><\/i>file<\/i><\/b>=<\/span><\/i>org.apache.log4j.<\/span><\/i>RollingFileAppender<\/i><\/b><\/p>\n
            log4j.appender.<\/span>stdout<\/b>=<\/span>org.apache.log4j.<\/span>ConsoleAppender<\/b><\/p>\n
            It will define appender type that means it specify where we want to store application logs . <\/span>RollingFileAppender will use to print all logs in file and <\/span><\/i>ConsoleAppender will use to print all log in console<\/span><\/p>\n
            log4j.appender.file.File<\/span>=<\/span>D:\\\\log\\\\logging.log<\/b><\/p>\n
            It specify log file location.<\/span><\/p>\n
            log4j.appender.<\/span>file.layout<\/b>=<\/span>org.apache.log4j.PatternLayout<\/span>
            \n<\/span>log4j.appender<\/span>.file.layout<\/b>.ConversionPattern<\/span>=<\/span>%d<\/span>{<\/span>yyyy-MM-dd HH:mm:ss<\/span>}<\/span> %-5p %c<\/span>{<\/span>1<\/span>}<\/span>:%L – %m%n<\/span><\/p>\n
            It specify the pattern in which log will print into log file<\/span><\/p>\n
            Example:<\/span><\/p>\n
            import org.apache.log4j.Logger;\r\n\r\npublic class Student {\r\n\u00a0\u00a0static Logger logger = Logger.getLogger(Student.class);\r\n\r\n\u00a0\u00a0public static void main(String[] args) { \u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0logger.debug(\"This is debug message\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0logger.info(\"This is info message\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0logger.warn(\"This is warn message\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0logger.fatal(\"This is fatal message\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0logger.error(\"This is error message\");\r\n\u00a0\u00a0\r\n\u00a0\u00a0\u00a0\u00a0\u00a0System.out.println(\"Logic executed successfully....\");\r\n\r\n\u00a0\u00a0\u00a0\u00a0}\r\n\r\n}\r\n\r\n<\/pre>\n
             <\/p>\n
            logging.log(log file)<\/b><\/p>\n
            2018-05-02 16:01:45 INFO \u00a0Student:12 - This is info message\r\n2018-05-02 16:01:45 WARN \u00a0Student:13 - This is warn message\r\n2018-05-02 16:01:45 FATAL Student:14 - This is fatal message\r\n2018-05-02 16:01:45 ERROR Student:15 - This is error message\r\n\r\n<\/pre>\n
             <\/p>\n
            It will not print debug level error logs because we defined root logger as INFO in log4j.properties<\/em> file . T<\/span>hat\u2019s why, error message will print which have priority greater than INFO level.<\/span><\/p>\n
            Console logs<\/b><\/p>\n
            16:01:45,511 &nbsp;INFO Student:12 - This is info message\r\n16:01:45,517 &nbsp;WARN Student:13 - This is warn message\r\n16:01:45,517 FATAL Student:14 - This is fatal message\r\n16:01:45,518 ERROR Student:15 - This is error message\r\n\r\nprogram executed successfully....<\/pre>\n
             <\/p>\n
             <\/p>\n","protected":false},"excerpt":{"rendered":"
            Why we use Log4j ? Log4j \u00a0is used for logging. Logging is the process of writing log message in any file, db,console etc( any central place). If we use SOP \u00a0(System.out.print() ) statement to print the log message then we can have some disadvantage : 1. We can print log message on console only. So […]<\/p>\n","protected":false},"author":1,"featured_media":4412,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[256],"tags":[245,224,253,255,254,214],"class_list":["post-4390","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-java-application","tag-j2ee","tag-java","tag-log4j","tag-log4j-apache-framework","tag-logging","tag-logs"],"yoast_head":"\nLogging with Log4j in JAVA - InnovationM - Blog<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.innovationm.com\/blog\/logging-with-log4j-in-java\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Logging with Log4j in JAVA - InnovationM - Blog\" \/>\n<meta property=\"og:description\" content=\"Why we use Log4j ? 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