[LOG4J2-1687] NPE in ThrowableProxy when resolving stack in Java EE/OSGi environment

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7
• Fix Version/s: 2.8
• Component/s: Core
• Labels: easyfix

Environment

• java version "1.7.0_80" ,Java(TM) SE Runtime Environment (build 1.7.0_80-b15), Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
• Jboss EAP 5.2.0-EAP

• Assignee: Gary D. Gregory
• Reporter: Robert Christiansen
• Created: 10/Nov/16 06:36
• Updated: 07/Dec/16 18:00
• Resolved: 06/Dec/16 16:23

Description

NPE when logging in Java EE/OSGi environment.

In some cases the ClassLoader ( https://docs.oracle.com/javase/7/docs/api/java/lang/Class.html#getClassLoader() ) will be null for a Class.

With the changes introduced in
https://issues.apache.org/jira/browse/LOG4J2-1457 logging with %xEx can cause a NullPointerExeception when trying to resolve the stack.

Since it's not a common occurrence in most environments I suggest the ThrowableProxy swallow the NPE in the same way it swallows SecurityExeception and other classloading exceptions to avoid extra branching for all environments.