Log4j Sample Program - Learn how log4j framework works starting from. Example that initializes, and then uses, the log4j logging library for Java applications.
CodeJava.net • Home • Java Core • The Java Language • Generics & Collections • Tools • Exception Handling • Concurrency • Java SE • Swing • Applet • File I/O • 2D/3D Graphics • Networking • FTP • JDBC • Java EE • Servlet • JavaMail • Web Services • JSTL • JavaServer Pages (JSP) • Java Persistence API • Frameworks • Spring • Spring Boot • Hibernate • Struts • IDEs • Eclipse • NetBeans • Servers • Tomcat • Coding • Books • Videos • Top Trending • Top Java Core and Java EE • Top Spring and Hibernate • Interview Questions • Certifications • Testing. Hot & New: j is a very popular logging library for Java development. It provides convenient and flexible logging mechanism as well as fast performance.Putting log4j into your code is pretty easy as it requires minimum of work which mostly involves in configuring the logging system. This article describes the configuration of log4j in details, as well as providing some working examples. Table of content • • • • • • • • 4. Steps to plug log4j into your codeTypically, the steps to use log4j in your Java application are as follows: • • Download latest log4j distribution. • Add log4j’s jar library into your program’s classpath.
• Create log4j’s configuration. • Initialize log4j with the configuration. • Create a logger.
• Put logging statements into your code. Download log4jYou can get a distribution of log4j at: The latest version of log4j is 1.2.17. Download log4j-1.2.17.zip file and extract the archive into a directory you like. The distribution comes with a lot of stuff: documentation, source code, examples but the only thing we need is the log4j-1.2.17.jar file – log4j’s JAR library.Add the log4j-1.2.17.jar into compilation classpath and runtime classpath of your project in order to have your code can be compiled and executed with log4j.
Table of Contents • • • • • • Logger in Java Java Logging API was introduced in 1.4 and you can use java logging API to log application messages. In this java logging tutorial, we will learn basic features of Java Logger. We will also look into Java Logger example of different logging levels, Logging Handlers, Formatters, Filters, Log Manager and logging configurations.
Java Logger java.util.logging.Logger is the class used to log application messages in java logging API. We can create java Logger with very simple one line code as.
Copy logger.setLevel(Level.FINE); The logs will be generated for all the levels equal to or greater than the logger level. For example if logger level is set to INFO, logs will be generated for INFO, WARNING and SEVERE logging messages. Java Logging Handlers We can add multiple handlers to a java logger and whenever we log any message, every handler will process it accordingly. There are two default handlers provided by Java Logging API. • ConsoleHandler: This handler writes all the logging messages to console • FileHandler: This handler writes all the logging messages to file in the XML format. We can create our own custom handlers also to perform specific tasks.
To create our own Handler class, we need to extend java.util.logging.Handler class or any of it’s subclasses like StreamHandler, SocketHandler etc. Here is an example of a custom java logging handler.
Copy handlers= java.util.logging.ConsoleHandler.level= FINE # default file output is in user's home directory. Java.util.logging.FileHandler.pattern =%h/java%u.log java.util.logging.FileHandler.limit = 50000 java.util.logging.FileHandler.count = 1 java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter # Limit the message that are printed on the console to INFO and above.
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