Adam Long created LOG4J2-3131:
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             Summary: Attempting to call getExtendedStackTraceAsString() after 
deserializing JSON LogEvent results in a NPE
                 Key: LOG4J2-3131
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3131
             Project: Log4j 2
          Issue Type: Bug
          Components: Layouts
    Affects Versions: 2.14.1
            Reporter: Adam Long
         Attachments: example.zip

How to reproduce:
 # Generate a LogEvent with an Exception that has at least one cause (i.e. 
nested Exception)
 # Use the standard JSON Layout to turn that LogEvent into JSON
 # Using JsonLogEventParser to turn it back into a LogEvent
 # Call getExtendedStackTraceAsString() on the ThrowableProxy associated with 
the deserialized LogEvent
 # A NullPointerException will be thrown

I've attached a small example project to reproduce the error.  



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