Log4j

Log4j multiple appenders

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Let us discuss the use of multiple appenders with the help of below example. In this example we are using two appenders CA(Console Appender) and FA(File Appender) with different configurations. Example: Log4jTest.java import org.apache.log4j.Logger;   /** * This class is used to show the use of * multiple appenders with the log4j.properties file. * @author … Read more

Log4j file appender

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Let us discuss the use of file appenders with the help of below example. Example: Log4jTest.java import org.apache.log4j.Logger;   /** * This class is used to show the use of * file appender with the log4j.properties file. * @author w3schools */ public class Log4jTest { //Get the Logger object. private static Logger log = Logger.getLogger(Log4jTest.class); … Read more

Logging levels in log4j

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Logging levels: All logging levels are defined in the org.apache.log4j.Level class. We can also create our own levels. Logging levels are given below: 1. ALL: All levels including custom levels also. 2. DEBUG: It helps developers in application debugging. 3. INFO: It gives the information about the progress of application and its states. 4. WARN: … Read more

Log4j example using log4j xml file

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We can also use an xml file named log4j.xml to configure the Log4j. Let us discuss the use of log4j.xml configuration file with the help of below example. Example: Log4jTest.java import org.apache.log4j.Logger;   /** * This class is used to show the use of * Log4j with the log4j.xml file. * @author w3schools */ public … Read more

Log4j example using log4j properties file

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Let us discuss the use of Log4j with the help of below example. In this example we use log4j.properties file for Log4j configurations. Example: Log4jTest.java import org.apache.log4j.Logger;   /** * This class is used to show the use of * Log4j with the log4j.properties file. * @author w3schools */ public class Log4jTest { //Get the … Read more

Java Log4j example

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Let us discuss the use of Log4j with the help of below example. In this example we use BasicConfigurator for Log4j configurations. BasicConfigurator use ConsoleAppender and PatternLayout for all loggers. Example: Log4jTest: import org.apache.log4j.BasicConfigurator; import org.apache.log4j.Logger;   /** * This class is used to show the use of * Log4j with the BasicConfigurator. * @author … Read more

Log4j Logger class

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Logger class: Logger class provides the methods for logging process. We can use the getLogger() method to get the Logger object. Syntax: public static Logger getLogger(String name); Where name is the fully qualified class name. Logging methods: 1. debug(Object message): It is used to print the message with the level Level.DEBUG. Syntax: public void debug(Object … Read more