[LOG4J2-1658] 2.7 - ThreadContextAccess.getThreadContextMap NPE when specifying BasicContextSelector

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7
• Fix Version/s: 2.8
• Component/s: Core

Environment

Windows, JVM 1.8.0_66

• Assignee: Remko Popma
• Reporter: Leon Finker
• Created: 01/Nov/16 21:29
• Updated: 03/Nov/16 22:12
• Resolved: 03/Nov/16 08:17

Description

We have a custom OSGi based application. We specify Log4jContextSelector=org.apache.logging.log4j.core.selector.BasicContextSelector. We initialize log4j through
Configurator.initialize("main", logConfigPath);

Starting from log4j2 2.7 above line fails due to NPE/ExceptionInInitializerError in LogManager static init block. I found a work around by specifying disableThreadContextMap=true. This is 2.7 specific change.

Exception in thread "main" java.lang.ExceptionInInitializerError
	at org.apache.logging.log4j.ThreadContextAccess.getThreadContextMap(ThreadContextAccess.java:45)
	at org.apache.logging.log4j.core.impl.ContextDataInjectorFactory.createDefaultInjector(ContextDataInjectorFactory.java:83)
	at org.apache.logging.log4j.core.impl.ContextDataInjectorFactory.createInjector(ContextDataInjectorFactory.java:67)
	at org.apache.logging.log4j.core.lookup.ContextMapLookup.<init>(ContextMapLookup.java:34)
	at org.apache.logging.log4j.core.lookup.Interpolator.<init>(Interpolator.java:116)
	at org.apache.logging.log4j.core.config.AbstractConfiguration.<init>(AbstractConfiguration.java:120)
	at org.apache.logging.log4j.core.config.NullConfiguration.<init>(NullConfiguration.java:32)
	at org.apache.logging.log4j.core.LoggerContext.<clinit>(LoggerContext.java:72)
	at org.apache.logging.log4j.core.selector.BasicContextSelector.<clinit>(BasicContextSelector.java:32)
	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:422)
	at org.apache.logging.log4j.util.LoaderUtil.newInstanceOf(LoaderUtil.java:158)
	at org.apache.logging.log4j.util.LoaderUtil.newInstanceOf(LoaderUtil.java:180)
	at org.apache.logging.log4j.util.LoaderUtil.newCheckedInstanceOf(LoaderUtil.java:201)
	at org.apache.logging.log4j.util.LoaderUtil.newCheckedInstanceOfProperty(LoaderUtil.java:226)
	at org.apache.logging.log4j.core.impl.Log4jContextFactory.createContextSelector(Log4jContextFactory.java:97)
	at org.apache.logging.log4j.core.impl.Log4jContextFactory.<init>(Log4jContextFactory.java:58)
	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:422)
	at java.lang.Class.newInstance(Class.java:442)
	at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:94)
	at org.apache.logging.log4j.core.config.Configurator.getFactory(Configurator.java:46)
	at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:157)
	at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:131)
	at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:101)
	at org.apache.logging.log4j.core.config.Configurator.initialize(Configurator.java:188)
	at com.tradingscreen.client.tradesmart.OSGiMain.initLogging(OSGiMain.java:264)
	at com.tradingscreen.client.tradesmart.OSGiMain.main(OSGiMain.java:86)
Caused by: java.lang.NullPointerException
	at org.apache.logging.log4j.spi.ThreadContextMapFactory.createThreadContextMap(ThreadContextMapFactory.java:59)
	at org.apache.logging.log4j.ThreadContext.init(ThreadContext.java:222)
	at org.apache.logging.log4j.ThreadContext.<clinit>(ThreadContext.java:201)
	... 32 more

Issue Links

• is related to: LOG4J2-1637 OSGi support is broken in Log4j2 2.7
• is related to: LOG4J2-1660 ThreadContext to expose ReadOnlyThreadContextMap internal data structure