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https://issues.apache.org/jira/browse/LOG4J2-2129?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16435160#comment-16435160
 ] 

Björn Kautler commented on LOG4J2-2129:
---------------------------------------

Well, if you have to use that evil plugin [~Johnston], then at least configure 
it correctly.

Your problem has nothing to do with this bug, but that you leave out necessary 
files.

It is surely significant, that the plugins documentation even uses {{log4j}} as 
example for preventing the minimizing: 
[https://maven.apache.org/plugins/maven-shade-plugin/examples/includes-excludes.html]
 last example

> 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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