Issue:

It always print "Exception at notify: Null pointer Exception" in the log.

Cause:

After checking the code, in LoggingAndURNMappingPlugin.java (line: 435), 

long startTime = startTimes.remove(id); 

It's possible that startTimes doesn't contain "id" which then return null and causes java unbox null pointer exception since startTime is a primitive type.

In my case, the reason why the id which has been added before cannot be found in the startTimes map is because the subprocess (waiting for async message) in SDNCAdpaterV1 uses the same execution id that the start event (inside) uses.