albertogpz opened a new pull request, #7845:
URL: https://github.com/apache/geode/pull/7845

   When the WAN group-transa$ction-events feature is enabled in
   a parallel gateway sender, it is possible to get a NullPointerException
   when retrieving events from the queue to complete a transaction if
   the event in the queue is null.
   
   If this situation is reached then the gateway sender dispatcher will
   not dispatch queue events anymore and therefore the WAN replication
   will not progress.
   
   This happens because the predicates that check if elements
   in the queue contain a transactionId are not protected
   against the event being null.
   
   A null check has been added before the predicates are invoked
   so that in case of a null event, the predicate is not invoked
   and the event is skipped from the checking.
   
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