Where are the Log4j jars located?


> On Apr 6, 2022, at 6:34 AM, Pooja Pandey <pooja.pan...@asg.com.INVALID> wrote:
> Hi,
> In my application, I have 2 processes running and there are 3 webapps war 
> files which get deployed in tomcat version 9.0.60. Out of these 3 war files, 
> one war file is internal to my application while other 2 are coming as final 
> artifacts from artifiactory.
> My war uses a custom logger and custom ContextSelector, however other 2 wars 
> from artifactory uses standard logger and standard ContextSelector.
> I have defined below system property as a static block in custom logger, 
> however for some unknown reason when my war gets deployed this log4j jars 
> don't find this property and leads to ClassCastException 
> "java.lang.ClassCastException: 
> org.apache.logging.log4j.core.selector.ContextSelector cannot be cast to 
> logger.log4j2.CustomLog4j2ContextSelector". To fix this I have placed 
> 'log4j2.component.properties' file on log4j jars class path, but with this 
> fix, following harmless error get logged for other 2 wars 
> "java.lang.ClassCastException: Cannot cast 
> logger.log4j2.CustomLog4j2ContextSelector to 
> org.apache.logging.log4j.core.selector.ContextSelector".
> I am looking for help to come up with a solution where, when my war gets 
> deployed then custom logger context 
> "logger.log4j2.CustomLog4j2ContextSelector" should be used while when other 2 
> wars get deployed then  
> "org.apache.logging.log4j.core.selector.ContextSelector" should be used. 
> Please let me know if you have any idea on this.
> static {
>    System.setProperty("Log4jContextSelector", 
> "logger.log4j2.CustomLog4j2ContextSelector");
> }
> Content of file 'log4j2.component.properties' ->
> Log4jContextSelector=logger.log4j2.CustomLog4j2ContextSelector

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