I think what you are trying to say is 1. Your app needs to use Log4J 1.x. 2. You are trying to include something that is using the Log4J 2 api.
The problem you are encountering is that you have provided 2 implementations of the Log4J api - log4j-to-slf4j and log4j-core. You can only have one of them. You need to exclude the Log4J core jar from whatever is declaring it as a dependency. On another note, converting Log4J 1 appenders to Log4J 2 isn’t particularly hard. Log4J 1 hasn’t been maintained in many years and was declared end-of-life 4 years ago. Ralph > On Aug 26, 2019, at 2:05 AM, Debraj Manna <subharaj.ma...@gmail.com> wrote: > > In an application using log4j with slf4j, I am trying to use a dependency > (elasticsearch in this) which depends on log4j2. > > The application's logging dependency looks like this- > > <dependency> > <groupId>org.elasticsearch</groupId> > <artifactId>elasticsearch</artifactId> > <version>5.6.16</version> > </dependency> > <dependency> > <groupId>org.elasticsearch.client</groupId> > <artifactId>transport</artifactId> > <version>5.6.16</version> > </dependency> > <dependency> > <groupId>org.apache.logging.log4j</groupId> > <artifactId>log4j-to-slf4j</artifactId> > <version>2.11.1</version> > </dependency> > > > The application is using its own log4j.xml and has some custom > appenders of log4j so it cannot be migrated to log4j2 without > rewriting the appenders. > > Added the below dependencies as suggested in elasticsearch > documentation > <https://www.elastic.co/guide/en/elasticsearch/client/java-api/current/_using_another_logger.html> > for using a different logger other than log4j2. > > <dependency> > <groupId>org.apache.logging.log4j</groupId> > <artifactId>log4j-to-slf4j</artifactId> > <version>2.11.1</version> > </dependency> > > But now on starting the application, I am seeing some warnings like below > > DEBUG StatusLogger org.slf4j.helpers.Log4jLoggerFactory is not on > classpath. Good! > DEBUG StatusLogger Using ShutdownCallbackRegistry class > org.apache.logging.log4j.core.util.DefaultShutdownCallbackRegistry > WARN StatusLogger Multiple logging implementations found: > Factory: org.apache.logging.log4j.core.impl.Log4jContextFactory, Weighting: 10 > Factory: org.apache.logging.slf4j.SLF4JLoggerContextFactory, Weighting: 15 > Using factory: org.apache.logging.slf4j.SLF4JLoggerContextFactory > > Can someone let me know what does this warning denote? How can I remove it? --------------------------------------------------------------------- To unsubscribe, e-mail: log4j-user-unsubscr...@logging.apache.org For additional commands, e-mail: log4j-user-h...@logging.apache.org
