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https://issues.apache.org/jira/browse/LOG4J2-1227?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15066613#comment-15066613
 ] 

ASF GitHub Bot commented on LOG4J2-1227:
----------------------------------------

GitHub user olivierlemasle opened a pull request:

    https://github.com/apache/logging-log4j2/pull/20

    LOG4J2-1227

    Test if the event is null before using it, to avoid NullPointerException.
    Add some unit tests.

You can merge this pull request into a Git repository by running:

    $ git pull https://github.com/olivierlemasle/logging-log4j2 LOG4J2-1227

Alternatively you can review and apply these changes as the patch at:

    https://github.com/apache/logging-log4j2/pull/20.patch

To close this pull request, make a commit to your master/trunk branch
with (at least) the following in the commit message:

    This closes #20
    
----
commit 33ee4bfd0aa1f58a705771222132a42d1dfb328c
Author: Olivier Lemasle <olivier.lema...@apalia.net>
Date:   2015-12-21T15:53:36Z

    LOG4J2-1227
        Test if the event is null before using it, to avoid 
NullPointerException.
        Add some unit tests.
        Submitted by: Olivier Lemasle <o.lema...@gmail.com>

----


> NullPointerException in MapLookup.lookup is the event is null
> -------------------------------------------------------------
>
>                 Key: LOG4J2-1227
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-1227
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.4, 2.4.1, 2.5
>            Reporter: Olivier Lemasle
>             Fix For: 2.5.1
>
>
> A NullPointerException is thrown in 
> org.apache.logging.log4j.core.lookup.MapLookup.lookup, when the event is null 
> and the map is not null.
> The event can indeed be null, for example if used from StrSubstitutor, with 
> the method replace(final StringBuilder source).
> Exception:
> java.lang.NullPointerException: null
>       at 
> org.apache.logging.log4j.core.lookup.MapLookup.lookup(MapLookup.java:121)



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