[LOG4J2-934] Circular suppressed Exception throws StackOverflowError

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.1, 2.3
• Assignee: Unassigned
• Reporter: Kenneth Gendron
• Created: 10/Jan/15 21:20
• Updated: 09/Jun/15 01:51
• Resolved: 09/Jun/15 01:51

Description

If an exception with a circular-referenced exception (suppressed, or otherwise) is logged, log4j will throw a StackOverflowError:

Exception e1 = new Exception();
Exception e2 = new Exception();
e2.addSuppressed(e1);
e1.addSuppressed(e2);
LoggerFactory.getLogger("root").error("Error", e1);

Will throw the following:

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)

A simple stack trace printout will produce the following:

java.lang.Exception
	at NewClass.main(NewClass.java:95)
	Suppressed: java.lang.Exception
		at NewClass.main(NewClass.java:96)
	[CIRCULAR REFERENCE:java.lang.Exception]

Issue Links

• is cloned by: LOG4J2-1046 Circular Exception cause throws StackOverflowError