Major Description
Using BasicContextSelector does not work when using Log4j in an OSGI application, see discussion on the mailing list: http://mail-archives.apache.org/mod_mbox/logging-log4j-user/201810.mbox/%3cAAA02DBF-18FF-4F31-9F5A-BAF4DBDBD679@dslextreme.com%3e
Basically, the problem is that core-class BasicContextSelector is being loaded by LoaderUtil class that is living in log4j-api which cannot access classes in log4j-core.
This is the error that occurs:
ERROR StatusLogger Unable to create custom ContextSelector. Falling back to default. java.lang.ClassNotFoundException: org.apache.logging.log4j.core.selector.BasicContextSelector cannot be found by org.apache.logging.log4j.api_2.11.2.SNAPSHOT at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:508) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:419) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:411) at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:150) at java.lang.ClassLoader.loadClass(ClassLoader.java:357) at java.lang.Class.forName0(Native Method) at java.lang.Class.forName(Class.java:264) at org.apache.logging.log4j.util.LoaderUtil.loadClass(LoaderUtil.java:168) at org.apache.logging.log4j.util.LoaderUtil.newInstanceOf(LoaderUtil.java:207) at org.apache.logging.log4j.util.LoaderUtil.newCheckedInstanceOf(LoaderUtil.java:228) at org.apache.logging.log4j.util.LoaderUtil.newCheckedInstanceOfProperty(LoaderUtil.java:253) at org.apache.logging.log4j.core.impl.Log4jContextFactory.createContextSelector(Log4jContextFactory.java:98) at org.apache.logging.log4j.core.impl.Log4jContextFactory.<init>(Log4jContextFactory.java:59) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:94) at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getContext(AbstractLoggerAdapter.java:121) at org.apache.logging.slf4j.Log4jLoggerFactory.getContext(Log4jLoggerFactory.java:49) at org.apache.logging.log4j.spi.AbstractLoggerAdapter.getLogger(AbstractLoggerAdapter.java:46) at org.apache.logging.slf4j.Log4jLoggerFactory.getLogger(Log4jLoggerFactory.java:29) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:355) at org.slf4j.LoggerFactory.getLogger(LoggerFactory.java:380) at com.servoy.j2db.server.main.Activator.<clinit>(Activator.java:44) at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at java.lang.Class.newInstance(Class.java:442) at org.eclipse.osgi.internal.framework.BundleContextImpl.loadBundleActivator(BundleContextImpl.java:763) at org.eclipse.osgi.internal.framework.BundleContextImpl.start(BundleContextImpl.java:716) at org.eclipse.osgi.internal.framework.EquinoxBundle.startWorker0(EquinoxBundle.java:1002) at org.eclipse.osgi.internal.framework.EquinoxBundle$EquinoxModule.startWorker(EquinoxBundle.java:354) at org.eclipse.osgi.container.Module.doStart(Module.java:581) at org.eclipse.osgi.container.Module.start(Module.java:449) at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:468) at org.eclipse.osgi.internal.hooks.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:114) at org.eclipse.osgi.internal.loader.classpath.ClasspathManager.findLocalClass(ClasspathManager.java:505) at org.eclipse.osgi.internal.loader.ModuleClassLoader.findLocalClass(ModuleClassLoader.java:328) at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:392) at org.eclipse.osgi.internal.loader.sources.SingleSourcePackage.loadClass(SingleSourcePackage.java:36) at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:419) at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:411) at org.eclipse.osgi.internal.loader.ModuleClassLoader.loadClass(ModuleClassLoader.java:150) at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
A fix for LOG4J2-920 was done with a similar issue in which a dependency from log4j-api to log4j-core was created in the manifest file.
As discussed on the mailing list, I will file a pull request that allows BasicContextSelector to work in an OSGI setup and removes the unwanted dependency again.
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