Question

I am starting new with Struts2. Using sl4j for logging in HelloWorld example. No log file is created and nothing in console.

Someone help me what I am doing wrong?

Below is my project structure.

Properties File

# Default Logging Level is DEBUG. levels: DEBUG < INFO < WARN < ERROR < FATAL OR ALL. Its only appender to FILE.

# Root logger option
log4j.rootLogger = ALL, FILE, stdout

# Define the file appender
# log4j.appender.FILE=org.apache.log4j.FileAppender

# backup the log files when they reach a certain size
log4j.appender.FILE=org.apache.log4j.RollingFileAppender

# Set the name of the file
log4j.appender.FILE.File=C:\\test.log

# Specify the log file size and max backup index.
log4j.appender.Logger.MaxFileSize=5mb
log4j.appender.Logger.MaxBackupIndex=20

# Set the threshold to debug mode
log4j.appender.FILE.Threshold=DEBUG

# Set the append to false, overwrite
log4j.appender.FILE.Append=false

# Define the layout for file appender
log4j.appender.FILE.layout=org.apache.log4j.PatternLayout
log4j.appender.FILE.layout.conversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

# log4j.rootLogger = ALL, FILE, stdout
# Output To Console: Direct log messages to stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n

Strust.xml

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.3//EN"
    "http://struts.apache.org/dtds/struts-2.3.dtd">

<struts>
    <constant name="struts.devMode" value="true" />

    <package name="default" extends="struts-default">
        <action name="HelloWorld" class="vaannila.HelloWorld">
            <result name="SUCCESS">/success.jsp</result>
        </action>
    </package>
</struts>

Answer 1

You need three jars in the deployed app’s classpath, which for the WAR is WEB-INF/lib. You need:

1. The slf4j interfaces that your code uses when logging
2. An actual logging framework that does the logging
3. The “binding” of that underlying framework to those slf4j interfaces

These things map, respectively, the following 3 jars, assuming log4j 1.2.x as the underlying framework.

1. slf4j-log4j12.jar
2. slf4j-api.jar
3. log4j12.jar

Also note that the slf4j documentation is thorough and to the point.

http://www.slf4j.org/manual.html