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From "Matt Sicker (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1687) NPE in ThrowableProxy when resolving stack
Date Wed, 30 Nov 2016 04:25:58 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1687?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15707496#comment-15707496
] 

Matt Sicker commented on LOG4J2-1687:
-------------------------------------

{{Class.getClassLoader()}} can return null for the bootstrap {{ClassLoader}}, so that would
also cause a NPE.

> NPE in ThrowableProxy when resolving stack
> ------------------------------------------
>
>                 Key: LOG4J2-1687
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1687
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.7
>         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
>            Reporter: Robert Christiansen
>              Labels: easyfix
>         Attachments: error.log, patch.diff
>
>
> 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.



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