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https://issues.apache.org/jira/browse/LOG4J2-835?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14137272#comment-14137272
 ] 

Anton Korenkov commented on LOG4J2-835:
---------------------------------------

I'll try explain on next example. I have next pattern:
{noformat}
pattern="[%d] [%t] %-5p %c %x - %m%n"
{noformat}

Wigh log4j 1.2.17 I'll see next stack trace in case of exception:
{noformat}
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:722)
{noformat}

But with logj4 2.0.2:
{noformat}
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145) 
[?:1.7.0_17]
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615) 
[?:1.7.0_17]
        at java.lang.Thread.run(Thread.java:722) [?:1.7.0_17]
{noformat}

As you may see there is one difference at the end of the line: [?:1.7.0_17] 
That what I meant by lib name and version.

> Possibility to turn off logging of lib name and version in exception stack 
> trace
> --------------------------------------------------------------------------------
>
>                 Key: LOG4J2-835
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-835
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 2.0.2
>            Reporter: Anton Korenkov
>            Priority: Minor
>
> New feature in log4j-2 is library name and version appending while logging 
> stack trace. Sometimes it's helpful, but in some cases it will be good to 
> turn off this feature by setting new property (e.g. "appned-lib") to false 
> for example.



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