[ 
https://issues.apache.org/jira/browse/LOG4J2-2058?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16190563#comment-16190563
 ] 

Gary Gregory commented on LOG4J2-2058:
--------------------------------------

FYI:

Applying this patch:
{noformat}
diff --git 
a/log4j-jul/src/test/java/org/apache/logging/log4j/jul/CoreLoggerTest.java 
b/log4j-jul/src/test/java/org/apache/logging/log4j/jul/CoreLoggerTest.java
index fbc17b2..6623c98 100644
--- a/log4j-jul/src/test/java/org/apache/logging/log4j/jul/CoreLoggerTest.java
+++ b/log4j-jul/src/test/java/org/apache/logging/log4j/jul/CoreLoggerTest.java
@@ -37,11 +37,13 @@
 
     @BeforeClass
     public static void setUpClass() {
+        System.setProperty("java.locale.providers", "HOST,JRE,SPI");
         System.setProperty("java.util.logging.manager", 
LogManager.class.getName());
     }
 
     @AfterClass
     public static void tearDownClass() {
+        System.clearProperty("java.locale.providers");
         System.clearProperty("java.util.logging.manager");
     }
 {noformat} 

and running {{mvn clean test -pl log4j-jul}} passes.

> java.locale.providers set to HOST causes Log4j2 to crash in Java 9
> ------------------------------------------------------------------
>
>                 Key: LOG4J2-2058
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-2058
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: JUL adapter, Pattern Converters
>    Affects Versions: 2.9.0, 2.9.1
>         Environment: Windows 10, Java 9
>            Reporter: Dean Wookey
>            Priority: Blocker
>
> When using the JUL log manager, setting the java.locale.providers property to 
> "HOST" causes log4j2 to crash when you next log something. 
> {code:java}
> public class LocalePropertyTest {
>     /**
>      * @param args the command line arguments
>      */
>     public static void main(String[] args) {
>         System.setProperty("java.locale.providers", "HOST,JRE,SPI");
>         System.setProperty("java.util.logging.manager", 
> "org.apache.logging.log4j.jul.LogManager");
>         
> Logger.getLogger(LocalePropertyTest.class.getName()).log(Level.WARNING, "this 
> is a test");
>     }
> }
> {code}
> The error is very long. Here are the first few lines:
> ERROR StatusLogger Error creating converter for d
>  java.lang.reflect.InvocationTargetException
>       at jdk.internal.reflect.GeneratedMethodAccessor1.invoke(Unknown Source)
>       at 
> java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
>       at java.base/java.lang.reflect.Method.invoke(Method.java:564)
>       at 
> org.apache.logging.log4j.core.pattern.PatternParser.createConverter(PatternParser.java:582)
>       at 
> org.apache.logging.log4j.core.pattern.PatternParser.finalizeConverter(PatternParser.java:638)
>       at 
> org.apache.logging.log4j.core.pattern.PatternParser.parse(PatternParser.java:414)
>       at 
> org.apache.logging.log4j.core.pattern.PatternParser.parse(PatternParser.java:177)
>       at 
> org.apache.logging.log4j.core.layout.PatternLayout$SerializerBuilder.build(PatternLayout.java:376)



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