This thread has grown too long. For anyone following this thread,
here's the summary:
Two web applications, each with a Virtual Host entry in server.xml file.
Tomcat/webapps-abc
Tomcat/webapps-xyz
These two web applications have different log4j.properties files.
These log4j property files log to different log files
(Tomcat/logs/abc.log and Tomcat/logs/xyz.log).
Tomcat/webapps-abc/ROOT/WEB-INF/classes/log4j.properties
Tomcat/webapps-xyz/ROOT/WEB-INF/classes/log4j.properties
The web applications abc and xyz using Java Commons Logging API (Log
and LogFactory classes) to perform logging.
Scenario 1:
log4j.jar is in Tomcat/lib directory
log4j.jar is NOT in WEB-INF/lib directories
Result:
abc webapp's log entries are written to xyz.log file
Scenario 2:
log4j.jar is NOT in Tomcat/lib directory
log4j.jar is in WEB-INF/lib directories
Result:
ClassNotFoundError in Tomcat/logs/catalina.log files
Scenario 3:
log4j.jar is in Tomcat/lib directory
log4j.jar is in WEB-INF/lib directories
Result:
Empty abc.log and xyz.log files.
Here's the relevant portion of the webapps-abc/ROOT/WEB-INF/web.xml file:
<listener>
<listener-class>org.springframework.web.util.Log4jConfigListener</listener-class>
</listener>
<context-param>
<param-name>log4jConfigLocation</param-name>
<param-value>/WEB-INF/classes/log4j.properties</param-value>
</context-param>
<context-param>
<param-name>log4jExposeWebAppRoot</param-name>
<param-value>false</param-value>
</context-param>
<listener>
<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
</listener>
webapps-xyz/ROOT/WEB-INF/web.xml file looks just the same
/* webapps-abc/ROOT/WEB-INF/classes/log4j.properties */
log4j.rootLogger=INFO, A2
log4j.appender.A2=org.apache.log4j.RollingFileAppender
log4j.appender.A2.layout=org.apache.log4j.PatternLayout
log4j.appender.A2.layout.ConversionPattern=%d{yyyy MMM dd / HH:mm:ss}
%-5p - [%c] : %m %n
log4j.appender.A2.File=c:/Tomcat6/logs/abc.log
log4j.appender.A2.MaxFileSize=100KB
log4j.appender.A2.MaxBackupIndex=4
/* webapps-xyz/ROOT/WEB-INF/classes/log4j.properties */
log4j.rootLogger=INFO, A1
log4j.appender.A1=org.apache.log4j.RollingFileAppender
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=%d{yyyy MMM dd / HH:mm:ss}
%-5p - [%c] : %m %n
log4j.appender.A1.File=c:/Tomcat6/logs/xyz.log
log4j.appender.A1.MaxFileSize=100KB
log4j.appender.A1.MaxBackupIndex=4
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