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https://issues.apache.org/jira/browse/LOG4J2-2196?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16331453#comment-16331453
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Raman Gupta commented on LOG4J2-2196:
-------------------------------------
Hi [~garydgregory], here is the configuration file:
https://gist.github.com/rocketraman/05eab786d5a172ff80b9a909d5587d3a
Here is the program:
{{import org.apache.logging.log4j.LogManager;}}
{{import org.apache.logging.log4j.Logger;}}
{{public class TestLogging {}}
{{ private static final Logger logger = LogManager.getLogger("HelloWorld");}}
{{ public static void main(String[] args) {}}
{{ logger.error("This is a test.", new Exception("Test exception!"));}}
{{ }}}
{{}}}
And here is the output:
{{2018-01-18 18:51:32,469 | This is a test. | EXCEPTION: java.lang.Exception:
Test exception!}}
{{ at TestLogging.main(TestLogging.java:8)}}
{{}}{{java.lang.Exception: Test exception!}}
{{ at TestLogging.main(TestLogging.java:8) [classes/:?]}}
> Pattern layout %notEmpty does not work for exceptions
> -----------------------------------------------------
>
> Key: LOG4J2-2196
> URL: https://issues.apache.org/jira/browse/LOG4J2-2196
> Project: Log4j 2
> Issue Type: Bug
> Components: Pattern Converters
> Affects Versions: 2.10.0
> Reporter: Raman Gupta
> Priority: Major
>
> Using a pattern layout that contains something like:
> {{%notEmpty\{EXCEPTION: %throwable}}}
> kind of works. However, when the Exception is not empty, it prints the
> Exception to the appender twice: once in the proper position within the
> pattern, and then again completely separately, with a newline before the
> second output.
> Note that the second output completely ignores any formatting specifications,
> such as separator or level-based ansi coloring – it seems as if the output of
> Exception.toString() had been sent to the appender directly).
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