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https://issues.apache.org/jira/browse/LOG4J2-2129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16426333#comment-16426333
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Christopher commented on LOG4J2-2129:
-------------------------------------

I get a similar error (jdk 9.0.4) using log4j 2.11.0 during runtime of an 
executable jar. I extracted the jar and the classes are there, but java -jar 
MyClass.jar outputs:

Exception in thread "main" java.lang.NoClassDefFoundError: Could not initialize 
class org.apache.logging.log4j.util.PropertiesUtil
 at org.apache.logging.log4j.status.StatusLogger.<clinit>(StatusLogger.java:78)
 at org.apache.logging.log4j.LogManager.<clinit>(LogManager.java:60)
 at com.myco.project.subproject.MyClass.<clinit>(MyClass.java:37)

private static final Logger LOGGER = LogManager.getLogger(MyClass.class); // 37

 

> Log4j2 throws NoClassDefFoundError in Java 9
> --------------------------------------------
>
>                 Key: LOG4J2-2129
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2129
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API
>    Affects Versions: 2.10.0, 2.11.0
>         Environment: Java 9
>            Reporter: Blazej
>            Priority: Major
>             Fix For: 2.11.0
>
>         Attachments: log4j-api-patch.jar
>
>
> When I execute a sample project 
> (https://github.com/bbucko/log4j2-jpms-sample) in Java 9 a following 
> exception is thrown:
> {code}
> 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)
> {code}
> Exception is a little bit misleading because it seems that true root cause 
> can be found here:
> {code}
> 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)
> {code}



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