Struts Tutorials:
Struts2 Tag CheckBoxList
, Checkbox, Iterator, IF
Struts2 Tag Library Example
Struts2 Tiles Example
Struts2 Tiles I18N Example
Struts2 Questions
Struts Tiles I18N Example
Struts Eclipse MVC
Struts2 Tags
Struts2 Example and Tutorial
Struts MVC
Struts2 Validation



Hibernate Tutorials:
Hibernate Case Study
Class Hierarchy Persist Example
Using Hibernate Interceptor
Hibernate Questions with Answer
Hibernate Many-to-Many Mapping Example
Hibernate one-to-many Mapping Example
Hibernate and ORM tools
Spring Hibernate Example
Hibernate SessionFactory Example
Hibernate Mapping Class Hierarchy
Hibernate Questions
Hibernate SessionFactory Questions

Spring Hibernate Example:
Spring Hibernate Case Study

Written By : Amit
Title :
How to use Log4j

Description :
PatternLayout
More...

Written By : Amit
Title :
Using NDC and Log4j

Description :
NDC Push with Log4j
More...

Written By : Amit
Title :
Log4j Example

Description :
Log4j Tutorial
More...

Written By : guddu
Title :
Apache Commons Logging

Description :
with Log4j Example
More...

Written By : ISHTEK
Title :
Log4j Example Configuration

Description :
Applying Levels Logger
More...

Tags/Keywords : Log4j Example, Log4j, Example,PatternLayout, Code, Tutorial, Article
Author : Amit
Date (Year/Month/Date): 2009-01-26
Logging Solution using Java Technology - 
Using Apache Log4j solution

Please be informed that NONE of the design/code from this
page is claiming to be some sort of best practices and we DO NOT expect
any of our visitor/reader of this page to assume this as some sort of
best practice for any context and should not be using this 
as it is without appropriate evaluation to their, so to say, 
specific programming context.

This page intends only to provide bit and piece of known ways  for
doing some sort of example and may not be fit for any other purpose.




Advertisement : 


Using Log4j with different types of logging mechanism 
such as Console, File:

Using Log4j to log messages to the log file.

Let us create a class and a main class and use Log4j to write out
messages in a predefined layout.

Logging is very important for tracing and knowing how system
is working in deployment/production environment. In case of any defects
logged by customer/end user, one of the initial way to find out the
problem, where it occurred is by analysing log file.

Note: This example is using Apache Log4j version 1.1.3

This class is implementing the BasicConfigurator
TestFileLog.java
import org.apache.log4j.FileAppender;
import org.apache.log4j.Category;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.PatternLayout;

public class TestFileLog {

   static Category logCategory = Category
                        .getInstance(TestFileLog.class);
   static String test = null;
   public TestFileLog()
   {
    try{
       PatternLayout patternLayout = new PatternLayout
                   ("%d [%t] %-5p %c - %m%n");
       FileAppender fileAppender = new FileAppender
           (patternLayout,"TestLog.log",true);
       BasicConfigurator.configure(fileAppender);

       analyse();

     }catch(Exception ex) {
     }
 }
 public void analyse() {
    logCategory.info("Entering application.");
    String[] str = new String[10];
    try{
     for(int i=0;i<=str.length;i++)
      str[i] = "Count:"+i;

    }catch(Exception ex) {
     logCategory.error(ex.toString());
    } finally {
     logCategory.info("Exiting Application.");
    }

   }
   public static void main(String[] args) {
     new TestFileLog();
   }
 }

Final result of this program is as follows:
 TestLog.log

2007-09-01 14:34:14,421 [main] INFO TestFileLog - Entering application.
2007-09-01 14:34:14,421 [main] ERROR TestFileLog -
java.lang.ArrayIndexOutOfBoundsException: 10
2007-09-01 14:34:14,421 [main] INFO TestFileLog - Exiting Application.

Another way of doing this is by using a properties file and reporting
the log onto the console screen.

log.properties
-----------------------------------------------------------------------
log4j.rootCategory=DEBUG, A1
log4j.appender.A1=org.apache.log4j.ConsoleAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout

# Print the date in ISO 8601 format
log4j.appender.A1.layout.ConversionPattern=%d [%t] %-5p %c - %m%n
-----------------------------------------------------------------------

The above mentioned properties file is used by the following java
program,

TestFileLog.java

import org.apache.log4j.Category;
import org.apache.log4j.PropertyConfigurator;

public class TestFileLog {

   static Category logCategory = Category
                           .getInstance(TestFileLog.class);
   static String test = null;
   public TestFileLog() {
     try{
        PropertyConfigurator.configure("log.properties");
        analyse();

     }catch(Exception ex) {
     }
   }
 public void analyse() {
     logCategory.info("Entering application.");
     String[] str = new String[10];
     try{
         for(int i=0;i<=str.length;i++)
         str[i] = "Count:"+i;

     }catch(Exception ex) {
       logCategory.error(ex.toString());
     } finally {
        logCategory.info("Exiting Application.");
     }
 }
   public static void main(String[] args) {
    new TestFileLog();
   }
 }
The output for this, comes out to be,


2007-09-01 14:37:53,328 [main] INFO TestFileLog - Entering application.
2007-09-01 14:37:53,328 [main] ERROR TestFileLog -
java.lang.ArrayIndexOutOfBoundsException: 10
2007-09-01 14:37:53,328 [main] INFO TestFileLog - Exiting Application.


All contents of this site are copyrighted by the Author, Contact Author
Reproduction of any of these material from this site, in any form,
is strictly prohibited.



Advertisement : 

Copyright © 2008-2009, Interview-Questions-Tips-Forum, All Rights Reserved.