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https://issues.apache.org/jira/browse/LOG4J2-373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14123338#comment-14123338
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Snehadeep Sethia commented on LOG4J2-373:
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I ran "mvn clean install" to install it to my local m2 repo. The issue building
2.1-SNAPSHOT was maven version, I was using 2.2.1 and later switched to 3.1.0
and it seems to install fine.
Step taken so far
1. Ran mvn clean install on log4j-api and log4j-core cloned from
https://github.com/apache/logging-log4j2.git and git checkout master
2. Ran "mvn eclipse:eclipse -DdownloadSources=true
-Declipse.useProjectReferences=false -DdownloadJavadocs=true -U" on the plugin
whose pom.xml has log4j-api and log4j-core as dependencies
3. Ram mvn copyresource to generate MANIFEST.MF on the plugin project
4. Ran "mvn eclipse:eclipse -DdownloadSources=true
-Declipse.useProjectReferences=false -DdownloadJavadocs=true -U" on the main
product
5. Ran "mvn clean install" on the main product
6. Ran the main product and get the exception "ERROR StatusLogger Log4j2 could
not find a logging implementation. Please add log4j-core to the classpath.
Using SimpleLogger to log to the console..."
I'm using
jdk1.6.0_45 (32 bit)
maven 3 to build the log4j jars
maven 2 to build the plugin and the product (we have a maven 2 constraint on
the product)
org.eclipse.osgi version "3.8.1-SDK-4.2.1"
> Classloader issue in OSGi-environment
> -------------------------------------
>
> Key: LOG4J2-373
> URL: https://issues.apache.org/jira/browse/LOG4J2-373
> Project: Log4j 2
> Issue Type: Bug
> Components: API, Core
> Affects Versions: 2.0-beta9
> Environment: OSGi R5 / R4 (Apache Felix 4.x)
> Reporter: Roland Weiglhofer
> Assignee: Matt Sicker
> Priority: Critical
> Labels: ClassLoader, OSGI
> Fix For: 2.0.1
>
> Attachments: log4j-api.patch
>
>
> Using Log4j2 in a bundle causes following error:
> ERROR StatusLogger org.apache.logging.log4j.core.impl.Log4jContextFactory
> does not implement org.apache.logging.log4j.spi.LoggerContextFactory
> ERROR StatusLogger Unable to locate a logging implementation, using
> SimpleLogger
> printing the ClassLoaders in LogManager gives me following output:
> org.apache.logging.log4j.spi.LoggerContextFactory loaded by
> org.apache.logging.log4j-api [13]
> org.apache.logging.log4j.core.impl.Log4jContextFactory loaded by
> sun.misc.Launcher$AppClassLoader@35a16869
> We have two different ClassLoaders. That's why the implementation is not
> assignable. The core uses the bootstrap-classloader and the api uses the
> bundle-classloader.
> Workaround needed. Thx
> addendum:
> ProviderUtil.findClassLoader() returns the bootstrap-classloader but not the
> bundle-classloader of the log4j2-core. The log4j2-core is a fragment of the
> log4j2-api bundle. Thus, ProviderUtil.findClassLoader() must return the
> bundle-classloader of log4j2-api. This a bug for the case that log4j2-core is
> used as the implementation. There are other cases that will also cause
> problems. Further investigations are necessary.
> Workaround:
> 1. check if log4j2 runs in an OSGI container.
> Bundle mybundle = org.osgi.framework.FrameworkUtil.getBundle(MyClass.this);
> 2. if(mybundle != null), than get bundle-classloader of log4j2-impl.
> mybundle.adapt(BundleWiring.class).getClassLoader();
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