log4j

1. A simple example of log4j
   This Example shows you how to create a log in a program.
            
2. log4j example
   This Example shows you how to create a log in a Servlet.
             
3. Use of BasicConfigurator in Log4j logging
   In earlier example you have seen that we can define properties of log4j logging file with the help of log4j.properties. Properties can also be defined within log4j.xml file.
            
4. log4j.xml Example
   In earlier example you have seen that we can define properties of log4j logging file with the help of log4j.properties. Properties can also be defined within log4j.xml file.
           
5. Console Appender in Log4j
   In this log4j console appender tutorial  you will be introduced with ConsoleAppender which is used in Log4j for appending output on the console each and every time when any info(), debug(), error() method is invoked by the logger.
                
6. FileAppender in Log4j
   In previous section we have used ConsoleAppender to append log events. We can also append these log events to a file by using FileAppender.
             
7. WriterAppender in Log4j
   In our previous section we have seen that we can append log events in simple file (plain/text) file and to the console also. If we want to write files then we have to use WriterAppender.
             
8. Layouts in Log4j
   Users more often wish to customize their output according to their output format. Layout can be set by attaching it with the appender. The Layout is responsible for formatting the logging output.
           
9. Use of SimpleLayout in Log4j
   In the previous example we have studied that there are many Layout classes for displaying logging output in the desired format. In this section we are going to describe you one of them, SimpleLayout, the simplest of all.
              
10. Use of XMLLayout in Log4j
    In the previous sections we have used PatternLayout and SimpleLayout, now we are going to describe you how to use XMLLayout class to produce logging output in the XML format.
             
11. TTCCLayout in Log4j
    In the previous example we have studied that there are many Layout classes for displaying logging output in the desired format. 
            
12. Use of HTMLLayout in Log4j
    In this section we will describe you about HTMLLayout class. This layout outputs events in a HTML table. Appenders using this layout should have their encoding set to UTF-8 or UTF-16, otherwise events containing non ASCII characters could result in corrupted log files. 
                       

13. A simple example of log4j for Servlet
    This Example shows you how to create a log in a Servlet.