rschmitt opened a new issue, #3873: URL: https://github.com/apache/logging-log4j2/issues/3873
Due to https://github.com/apache/logging-log4j2/pull/3045, all exception messages are prefixed with a newline now: ```text [SIGTSTP] [1] ~/src/logging-log4j2 # rg -txml pattern src/main/resources/log4j2.xml 6: <pattern>%date{EEE MMM dd HH:mm:ss yyyy zzz}{UTC} [%p] (%t) %c: %m %ex%n</pattern> ``` ```text [0] [1] ~/src/logging-log4j2 # ./run.sh Darwin 842f57b044d8 24.5.0 Darwin Kernel Version 24.5.0: Tue Apr 22 19:53:27 PDT 2025; root:xnu-11417.121.6~2/RELEASE_ARM64_T6041 arm64 Log4j 2.24.3: Thu Aug 07 17:22:01 2025 UTC [ERROR] (main) org.example.App: Going to call a method now Thu Aug 07 17:22:01 2025 UTC [ERROR] (main) org.example.App: Got exception while calling throwException, how could this have happened java.lang.RuntimeException: This is the message passed to the RuntimeException ctor at org.example.App.throwException(App.java:20) at org.example.App.main(App.java:12) Thu Aug 07 17:22:01 2025 UTC [ERROR] (main) org.example.App: Done calling method Log4j 2.25.0: Thu Aug 07 17:22:02 2025 UTC [ERROR] (main) org.example.App: Going to call a method now Thu Aug 07 17:22:02 2025 UTC [ERROR] (main) org.example.App: Got exception while calling throwException, how could this have happened java.lang.RuntimeException: This is the message passed to the RuntimeException ctor at org.example.App.throwException(App.java:20) at org.example.App.main(App.java:12) Thu Aug 07 17:22:02 2025 UTC [ERROR] (main) org.example.App: Done calling method ``` I don't see a way to reproduce the 2.24.3 style of log messages with the [pattern layout](https://logging.apache.org/log4j/2.x/manual/pattern-layout.html#converter-exception). 1. Using `%ex{0}` to get the first line doesn't work, because a line separator is prepended. 2. I can't find anything in `ThrowableFormatOptions` that provides the type of the exception thrown. A pattern like `%m %ex{short.message}%n` doesn't fully reproduce the top line of the stack trace. 3. Using `%n%ex` to print the rest of the stack trace repeats the first line. In other words, there's no way to just print the _frames_ of the stack trace. Since this layout change affects log scans, I'd like it if there were a way to specify a pattern that reproduces the pre-2.25 layout for anyone who depends on it. -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: [email protected] For queries about this service, please contact Infrastructure at: [email protected]
