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Thomas,

On 2/20/19 08:00, Thomas Rohde wrote:
> I've some basic questions regarding the usage of log4j 1.2 in
> Tomcat 8.5.
> 
> We are running more than one web application in Tomcat. Each
> application uses log4j via slf4j and ships the log4j.jar in
> WEB-INF/lib. The Tomcat itself uses JULI.
> 
> We are using a common log4j.xml file for configuration.
> 
> The file path is set as system property in CATALINA_OPTS as
> follows: -Dlog4j.configuration=/path/to/file/log4j.xml
> 
> 1. Is this a valid setup or are there any side effects in
> initialization log4j by the different WebAppClassLoaders?

You are not using classpath-based config-file-loading, so it should
not be a problem[*].

> 2. We are observing weird things in rolling the files hourly. The
> timestamp of the log messages doesn't fit to the timestamp suffix
> of the file. Why does this happen?

Possibly conflicting time zones, somewhere? Because log4j.jar is in
each application's class loader, they CAN have different in-memory
configurations.

[*] While this will work, why would you ever want multiple
applications to have their logging configuration all tied together?
Why not separate the logging configuration into one config-per web
application? OR are you trying to unify all logging into the same file(s
)?

- -chris
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