[LOG4J2-2129] Log4j2 throws NoClassDefFoundError in Java 9

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.10.0, 2.11.0
• Fix Version/s: 2.11.0
• Component/s: API

Environment

Java 9

• Assignee: Unassigned
• Reporter: Blazej
• Created: 26/Nov/17 20:46
• Updated: 12/Apr/18 08:39
• Resolved: 09/Jan/18 05:48

Description

When I execute a sample project (https://github.com/bbucko/log4j2-jpms-sample) in Java 9 a following exception is thrown:

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize class org.apache.logging.log4j.util.PropertiesUtil
	at org.apache.logging.log4j/org.apache.logging.log4j.status.StatusLogger.<clinit>(StatusLogger.java:71)
	at org.apache.logging.log4j/org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:60)

Exception is a little bit misleading because it seems that true root cause can be found here:

java.util.ServiceConfigurationError: org.apache.logging.log4j.util.PropertySource: module org.apache.logging.log4j does not declare `uses`
	at java.base/java.util.ServiceLoader.fail(ServiceLoader.java:588)
	at java.base/java.util.ServiceLoader.checkCaller(ServiceLoader.java:574)
	at java.base/java.util.ServiceLoader.<init>(ServiceLoader.java:503)
	at java.base/java.util.ServiceLoader.load(ServiceLoader.java:1684)
	at org.apache.logging.log4j/org.apache.logging.log4j.util.PropertiesUtil$Environment.<init>(PropertiesUtil.java:319)
	at org.apache.logging.log4j/org.apache.logging.log4j.util.PropertiesUtil$Environment.<init>(PropertiesUtil.java:310)
	at org.apache.logging.log4j/org.apache.logging.log4j.util.PropertiesUtil.<init>(PropertiesUtil.java:69)
	at org.apache.logging.log4j/org.apache.logging.log4j.util.PropertiesUtil.<clinit>(PropertiesUtil.java:49)
	at org.apache.logging.log4j/org.apache.logging.log4j.util.Constants.<clinit>(Constants.java:30)
	at java.base/java.lang.Class.forName0(Native Method)
	at java.base/java.lang.Class.forName(Class.java:375)
	at org.apache.logging.log4j/org.apache.logging.log4j.spi.AbstractLogger.createClassForProperty(AbstractLogger.java:198)
	at org.apache.logging.log4j/org.apache.logging.log4j.spi.AbstractLogger.<clinit>(AbstractLogger.java:88)
	at org.apache.logging.log4j/org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:60)

Issue Links

• is duplicated by: LOG4J2-2241 log4j-slf4j-impl does not provide slf4j with the service provider with Java 9
• is duplicated by: LOG4J2-2249 The module-info of org.apache.logging.log4j miss some directive 'uses'
• links to: GitHub Pull Request #136