Hi All:
I have a web application that uses log4j (v2.20) which runs inside
Tomcat 9.x on Java 8.
Currently, the WEB-INF/log4j2.xml configuration file in the application
sends its output to a rolling file appender targeting a separate file on
the file system, but what I'd like to do is make all log4j output go to
the regular per-application log under ${catalina_base}/logs which is
managed by the stock Tomcat JULI implementation.
We now have the log4j-to-jul module which can adapt log4j 2 output back
to java.util.logging.
Similar to my understanding of the purpose for log4j-to-slf4j, it seems
that log4j-to-jul is meant to be used as an implementation by itself for
log4j-api and without log4j-core.
The application currently uses log4j-web to get the all the essential
setup for initializing log4j 2 under an application container. The
log4j-web library appears to have a hard dependency on log4j-core.
After adding log4j-to-jul to the application classpath, I can see that
it is recognized:
Multiple logging implementations found:
Factory: org.apache.logging.log4j.core.impl.Log4jContextFactory,
Weighting: 10
Factory: org.apache.logging.log4j.tojul.JULLoggerContextFactory,
Weighting: 20
But then the following error is reported:
ERROR StatusLogger LogManager returned an instance of
org.apache.logging.log4j.tojul.JULLoggerContextFactory which does not
implement org.apache.logging.log4j.core.impl.Log4jContextFactory.
Unable to initialize Log4j.
In org.apache.logging.core.config.Configurator, line 47 there is a
conditional that checks the return type of the logging implementation
is-a Log4jContextFactory. The problem is then that
JULLoggerContextFactory implements only LoggerContextFactory.
I'd like to keep my tomcat container as stock as possible. Particularly,
continuing to use the built-in JULI per-application logging and *not*
switching the entire container to use log4j as its logging implementation.
Can anyone suggest how I can use log4j-to-jul successfully for my use case?
Thanks,
Jason
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