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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via Apache's JIRA Issue Tracker by Koji Kawamura, 1 year ago
java.util.concurrent.ExecutionException: java.lang.NullPointerException
via by Unknown author, 1 year ago
java.util.concurrent.ExecutionException: java.lang.AssertionError: assertion failed
java.lang.NullPointerException: null	at java.util.Hashtable.put(	at java.util.Properties.setProperty(	at org.apache.nifi.processors.kafka.GetKafka.createConsumers(	at org.apache.nifi.processors.kafka.GetKafka$	at org.apache.nifi.processors.kafka.GetKafka$	at	at java.util.concurrent.ThreadPoolExecutor.runWorker(	at java.util.concurrent.ThreadPoolExecutor$	at