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via by Unknown author, 1 year ago java.util.concurrent.ExecutionException: java.lang.NullPointerException
java.lang.NullPointerException: 	at$ Source)	at	at	at Source)	at Source)	at Source)	at	at java.util.concurrent.Executors$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at