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Posted to log4j-dev@logging.apache.org by "Snehadeep Sethia (JIRA)" <ji...@apache.org> on 2014/09/05 15:42:28 UTC
[jira] [Comment Edited] (LOG4J2-373) Classloader issue in
OSGi-environment
[ https://issues.apache.org/jira/browse/LOG4J2-373?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14122911#comment-14122911 ]
Snehadeep Sethia edited comment on LOG4J2-373 at 9/5/14 1:41 PM:
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I get Compilation errors on the log4j-api project
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] c:\Users\SD\Desktop\log4j master\logging-log4j2\log4j-api\src\test\java\org\apache\logging\log4j\message\LocalizedMessageTest.java:[36,45] type parameters of <T>T cannot be determi
ned; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object
[INFO] 1 error
for the time being I've commented the test and proceed with mvn clean install on the project.
I checked out master from here https://github.com/apache/logging-log4j2.git
I still don't see the issue being resolved. I still get the same error (I verified that the jars in the class path were log4j-api-2.1-SNAPSHOT and log4j-core-2.1-SNAPSHOT)
[~jvz] I see the pom version as 2.1-SNAPSHOT, did you fix it on 2.0.1 or 2.0.2?
was (Author: ssethia):
I get Compilation errors on the log4j-api project
[ERROR] COMPILATION ERROR :
[INFO] -------------------------------------------------------------
[ERROR] c:\Users\SD\Desktop\log4j master\logging-log4j2\log4j-api\src\test\java\org\apache\logging\log4j\message\LocalizedMessageTest.java:[36,45] type parameters of <T>T cannot be determi
ned; no unique maximal instance exists for type variable T with upper bounds T,java.lang.Object
[INFO] 1 error
I checked out master from here https://github.com/apache/logging-log4j2.git
[~jvz] I see the pom version as 2.1-SNAPSHOT, did you fix it on 2.0.1 or 2.0.2?
> 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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