Github user markap14 commented on the issue:
https://github.com/apache/nifi/pull/1413
@mcgilman very cool to have this making its way into NiFi! I did some
testing, and things work well for the most part. However, I did hit a NPE when
running in non-cluster mode:
```
2017-01-13 17:39:42,680 ERROR [NiFi Web Server-33]
o.a.nifi.web.api.config.ThrowableMapper An unexpected error has occurred:
java.lang.NullPointerException. Returning Internal Server Error response.
java.lang.NullPointerException: null
at
org.apache.nifi.web.api.ProvenanceEventResource.getProvenanceEvent(ProvenanceEventResource.java:293)
~[classes/:na]
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
~[na:1.8.0_111]
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
~[na:1.8.0_111]
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[na:1.8.0_111]
at java.lang.reflect.Method.invoke(Method.java:498) ~[na:1.8.0_111]
```
Looks like the resource is calling getClusterCoordinator() and not
expecting a 'null' to be returned. But in standalone mode, there's no Cluster
Coordinator.
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