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From Ralph Goers <ralph.go...@dslextreme.com>
Subject Re: Apache commons-logging bridge for log4j2
Date Wed, 05 Jul 2017 17:29:33 GMT
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 <boards@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 <azinneera@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 <boards@gmail.com>


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