The ServiceLoader needs special handling to work in OSGi. See http://blog.osgi.org/2013/02/javautilserviceloader-in-osgi.html <http://blog.osgi.org/2013/02/javautilserviceloader-in-osgi.html>
Ralph > On Jul 5, 2017, at 10:27 AM, Matt Sicker <boa...@gmail.com> wrote: > > It's loaded via the ServiceLoader interface: > > https://github.com/apache/logging-log4j2/blob/master/log4j-jcl/src/main/resources/META-INF/services/org.apache.commons.logging.LogFactory > > On 5 July 2017 at 03:30, Asma Zinneera Jabir <azinne...@gmail.com> wrote: > >> I am trying to set up log4j2 for Apache Commons Logging using the >> *commons-logging.properties* file in an OSGi environment. For Log4j 1 I >> could use org.apache.commons.logging.Log=org.apache.commons.logging.impl. >> Log4JLogger which maps to version Log4j 1.2. I couldn't find out the >> implementation for log4J2. The version I am using is 2.8.2. >> >> There is a central logging component which is referred by other components >> and this component bundles other needed loggers (e.g. commons-logging, >> log4j/log4j2) added as dependencies. >> >> The Log4J2 documentation for Log4J Commons Logging Bridge >> <https://logging.apache.org/log4j/log4j-2.3/log4j-jcl/index.html> >> specifies >> that by just *adding the bridge jar along with the other Log4j 2 jars and >> the Commons Logging jar, all logging done using the Commons Logging API >> will be routed to Log4*. I tried this by adding >> >> - log4j-api >> - log4j-core >> - log4j-jcl >> - commons-logging >> >> dependencies in the *pom.xml* of the central logging component and bundled >> with it without (and with just to check) using the >> *commons-logging.properties* but didn't work that way. How can I implement >> this with or without the commons-logging.properties? >> >> I debugged the commons-logging source code and found in >> LogFactoryImpl.java it >> looks for a logging implementation (L843 >> <https://github.com/apache/commons-logging/blob/LOGGING_ >> 1_2/src/main/java/org/apache/commons/logging/impl/LogFactoryImpl.java#L843 >>> ) >> from a list (L162 >> <https://github.com/apache/commons-logging/blob/LOGGING_ >> 1_2/src/main/java/org/apache/commons/logging/impl/LogFactoryImpl.java#L162 >>> ). >> Here since the Log4JLogger does not support Log4J2 it then sets to the next >> in line, that is JDK14Logger. Since the Log4J2 documentaiton says adding >> the bridge simply maps the logs from JCL to Log4J2, what role does the >> bridging api play here? I noticed the LogFactoryImpl.java and >> Log4JLog.java in >> it but how does commons-logging refer to these which are in a different >> package? >> >> stackoverflow question: Apache commons-logging bridge for log4j2 >> <https://stackoverflow.com/questions/44839779/apache- >> commons-logging-bridge-for-log4j2> >> > > > > -- > Matt Sicker <boa...@gmail.com>
