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https://issues.apache.org/jira/browse/LOG4J2-934?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
 ]

Gary Gregory resolved LOG4J2-934.
---------------------------------
    Resolution: Fixed

Please verify and close.

> Circular suppressed Exception throws StackOverflowError
> -------------------------------------------------------
>
>                 Key: LOG4J2-934
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-934
>             Project: Log4j 2
>          Issue Type: Bug
>    Affects Versions: 2.1, 2.3
>            Reporter: Kenneth Gendron
>
> If an exception with a circular-referenced exception (suppressed, or 
> otherwise) is logged, log4j will throw a StackOverflowError:
> {code:java}
> Exception e1 = new Exception();
> Exception e2 = new Exception();
> e2.addSuppressed(e1);
> e1.addSuppressed(e2);
> LoggerFactory.getLogger("root").error("Error", e1);
> {code}
> Will throw the following:
> {code:java}
> Exception in thread "main" java.lang.StackOverflowError
>       at java.util.HashMap.hash(HashMap.java:338)
>       at java.util.HashMap.get(HashMap.java:556)
>       at java.lang.ClassLoader.getPackage(ClassLoader.java:1608)
>       at java.lang.Package.getPackage(Package.java:334)
>       at java.lang.Class.getPackage(Class.java:783)
>       at 
> org.apache.logging.log4j.core.impl.ThrowableProxy.toCacheEntry(ThrowableProxy.java:495)
>       at 
> org.apache.logging.log4j.core.impl.ThrowableProxy.toExtendedStackTrace(ThrowableProxy.java:547)
>       at 
> org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:113)
>       at 
> org.apache.logging.log4j.core.impl.ThrowableProxy.toSuppressedProxies(ThrowableProxy.java:588)
>       at 
> org.apache.logging.log4j.core.impl.ThrowableProxy.<init>(ThrowableProxy.java:116)
>       at 
> org.apache.logging.log4j.core.impl.ThrowableProxy.toSuppressedProxies(ThrowableProxy.java:588)
> {code}
> A simple stack trace printout will produce the following:
> {code:java}
> java.lang.Exception
>       at NewClass.main(NewClass.java:95)
>       Suppressed: java.lang.Exception
>               at NewClass.main(NewClass.java:96)
>       [CIRCULAR REFERENCE:java.lang.Exception]
> {code}



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