ramanathan1504 opened a new pull request, #4124:
URL: https://github.com/apache/logging-log4j2/pull/4124

   FIxes #2250
   
   ## Reference URLs
   - https://logging.apache.org/log4j/2.x/manual/async.html
   - https://github.com/LMAX-Exchange/disruptor
   - https://lists.apache.org/thread/ynxrn9vsmdqs31jrml71xb582o7m74qf
   
   ## What was done
   - Added defensive `LinkageError` handling in `DisruptorUtil` when creating 
async logger exception handlers.
   - Added a shared error log helper to emit a clear classpath/version mismatch 
message for Disruptor linkage problems.
   - Guarded `sequenceCallback.set(sequence)` with a null check in 
`RingBufferLogEventHandler4` to prevent NPE when callback is not initialized.


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