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Different loggers can be used to log web application outputs. The following instructions are for Log4j java.util.logging.

Web Application logging with

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To include log4j logging in your web application add the following dependency to your maven project file:

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<dependency>
    <groupId>log4j</groupId>
    <artifactId>log4j</artifactId>
    <version>1.2.13</version>
    <type>jar</type>
    <properties>
       <war.bundle>true</war.bundle>
    </properties>
</dependency>
<dependency>
    <groupId>commons-logging</groupId>
    <artifactId>commons-logging</artifactId>
    <version>1.0.4</version>
    <type>jar</type>
    <url>http://jakarta.apache.org/commons/logging</url>
    <properties>
       <war.bundle>true</war.bundle>
    </properties>
</dependency>

java.util.logging

All you have to do is create a file called loggingCreate a file called log4j.properties in WEB-INF/classes with the following content, where you have replaced APPLICATION_OUTPUT_FILE with your choice of output file name (it would be nice to have in it the name of the application that produced the file):

#
#handlers Configures Log4j as the Tomcat system logger
#

#= org.apache.juli.FileHandler

############################################################
# ConfigureHandler the logger to output info level messages into a rolling log filespecific properties.
#
log4j.rootLogger=INFO, R

#
# Configuration for a rolling log file
#
log4j.appender.R= Describes specific configuration info for Handlers.
############################################################

org.apache.log4j.RollingFileAppender

#
# Edit the next line to point to your logs directory.
# The last part of the name is the log file name.
#
log4j.appender.R.File=juli.FileHandler.level = FINE
org.apache.juli.FileHandler.directory = ${catalina.base}/logs/APPLICATION_OUTPUT_FILE.log
log4j.appender.R.layout=org.apache.log4jjuli.PatternLayout
log4j.appender.R.MaxFileSize=5036KB
log4j.appender.R.MaxBackupIndex=4

#
# Print the date in ISO 8601 format
#
log4j.appender.R.layout.ConversionPattern=%d %-5p - %m%n

The above configuration creates a rolling output file. Once the file reaches 0.5 Mb in size it is renamed by adding an index to its end and a new log file is created. A maximum of 4 log files is kept.

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FileHandler.prefix = APPLICATION_OUTPUT_FILE.

If you now redeploy your application all the output from your application should be logged in the file you chose.

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