Hello.
I have multiple microservices, some run on Tomcat some are standalone
jars. We used to log using java.util.logging framework. Later we made
switch to Log4j2 (+ JUL adapter), but kept the JUL API for logging as to
not to have to rewrite the code. This works (and it can not be changed
although I would like to). Obviously there is some log level translation
as JUL and Log4j2 use different log level. In non-Tomcat services, log
levels look like this:
14:49:58.612 FINEST - t1 Log level FINEST enabled
14:49:58.612 TRACE - t1 Log level FINER enabled
14:49:58.613 DEBUG - t1 Log level FINE enabled
14:49:58.613 CONFIG - t1 Log level CONFIG enabled
14:49:58.613 INFO - t1 Log level INFO enabled
14:49:58.613 WARN - t1 Log level WARNING enabled
14:49:58.614 ERROR - t1 Log level SEVERE enabled
This is expected behavior.
However, on Tomcat, we get this:
14:46:38.393 TRACE - t1 Log level FINEST enabled
14:46:38.394 DEBUG - t1 Log level FINER enabled
14:46:38.394 DEBUG - t1 Log level FINE enabled
14:46:38.395 INFO - t1 Log level CONFIG enabled
14:46:38.396 INFO - t1 Log level INFO enabled
14:46:38.396 WARN - t1 Log level WARNING enabled
14:46:38.397 ERROR - t1 Log level SEVERE enabled
This is not correct. I belive it has something to do with the
translation from-to JUL, since Tomcat's JULI is based on JUL.
In order to confirm my suspicion, I have switched Tomcat to use Log4j2
also for it's internal logging, which solved the log level issue but
brought another. Thread context is not injected to Log4j2 logs anymore.
I suspect it is because there are now running 2 Log4j instances - one
for Tomcat and one for our app.
To solve my issue, I would be happy with either of the solutions
- Fix Tomcat using JULI to show correct Log4j2 log levels or
- Use Tomcat with Log4j instead of JULI but keep ThreadContext working
First one is preferred solution if possible.
Thanks for any suggestions.
--
Best regards,
Martin Dratva
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