gnodet opened a new pull request, #1078:
URL: https://github.com/apache/maven-mvnd/pull/1078

   The Server was using a SynchrnousQueue to coordinate the main thread
   and the background thread that receives the request from the client.
   A SynchronousQueue only allows insertions when a corresponding call
   to `get` is in progress. However, since the receiver thread is started
   before the call to `get`, there was a short time window, where the call
   to `queue.offer` could fail and simply return `false`. This return code
   was ignored.
   
   A possible solution would have been to call `put` instead of `offer`,
   but I decided to replace the queue with a Future, since we only wait
   for a single element.
   


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