The log4j-jul module is what maps anyone coding to java.util.logging to use Log4j 2 as the recommendation. The log4j-to-jul module is used when Log4j 2 is the API and java.util.logging is the implementation.
Note that log4j-to-jul is fairly new. It was introduced by LOG4J2-3282 in Jira in Jan 2022 as a user contribution, although it has had a few minor modifications since then. Ralph > On Jan 24, 2023, at 6:44 PM, Usha Nayak <usha...@gmail.com> wrote: > > Thank you all for your response. > > I did look through the documentation. However, the impression I got from the > 'Using log4j2 with JUL' section was that log4j2 is used as a logging > framework (application uses JUL lib and with 'log4j-jul' bridge connects to > log4j2 logging framework) . In my case, it's an opposite requirement. > > I did come across below though in FAQ section: > > > > > > which makes me think that an application ( who are consumers of my lib, which > is based of log4j2 API ) will need log4j-to-slf4j-2.x.jar, > slf4j-api.jar,slf4j-jdk14.jar (jul binding for slf4j delegating all slf4j > calls to be JUL ) > > On the other hand, if my lib were to be based of slf4j API, then the > applications (consumers of my lib ) will only need slf4j-jdk14.jar > > My understanding is a library should be based on only an api jar and nothing > else and it's an application that'll provide the bindings. With the log4j2 > API, there are quite a few bindings that applications will need to be aware > of. Am I missing something? > > Thanks. Regards > > > > > > > On Tue, Jan 24, 2023 at 7:31 PM Gary Gregory <garydgreg...@gmail.com > <mailto:garydgreg...@gmail.com>> wrote: >> How about https://logging.apache.org/log4j/2.x/manual/api-separation.html >> >> Gary >> >> On Tue, Jan 24, 2023, 18:31 Matt Sicker <m...@musigma.org >> <mailto:m...@musigma.org>> wrote: >> >> > That’s the log4j-to-jul module. I can’t find a link on the site, but >> > here’s the module overview page: >> > https://logging.apache.org/log4j/2.x/log4j-to-jul/index.html >> > >> > > On Jan 24, 2023, at 5:01 PM, Usha Nayak <usha...@gmail.com >> > > <mailto:usha...@gmail.com>> wrote: >> > > >> > > Hello All, >> > > >> > > As a library owner, if I were to use the log4j2 API and the application >> > > that uses my library has a java.util.logging ( JUL ) framework. >> > > >> > > What adapter or routing jars will be needed at runtime by application >> > such >> > > that all the logs, both from the library and the application, end up >> > using >> > > the same logging framework implementation (JUL) ? >> > > >> > > Any help greatly appreciated >> > > >> > > Thanks >> > >> >
