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Matt Gilman commented on NIFI-5034: ----------------------------------- [~markbean] Also, when the UI shows an "An unexpected error has occurred" message it is usually accompanied with more details. You can additionally enable more logging for these error responses. In your logback, try updating this line to be DEBUG level: <logger name="org.apache.nifi.web.security" level="DEBUG" additivity="false"> <appender-ref ref="USER_FILE"/> </logger> > Error in Controller Service with dynamic property in Cluster environment > ------------------------------------------------------------------------ > > Key: NIFI-5034 > URL: https://issues.apache.org/jira/browse/NIFI-5034 > Project: Apache NiFi > Issue Type: Bug > Components: Core Framework > Affects Versions: 1.4.0, 1.5.0 > Reporter: Mark Bean > Priority: Major > > Environment: Controller Service provides a lookup service to other Controller > Services. To configure, the lookup CS uses dynamic properties where the key > is an arbitrary name and the value is an existing Controller Service. > In a cluster environment only (this is not an issue for stand-alone > environment), the UI displays returns "An unexpected error has occurred" due > to http 500 return code. This occurs when attempting to configure the > controller service with the dynamic property. Additionally, it throws the > same error (http 500) when trying to configure the process group owning the > lookup controller service. (The property on the controller service is created > despite the 500 return code.) > Diving into the code a bit, the fact of being a "cluster only" issue is in > FlowResource.java:400. > if (isReplicateRequest()) { > return replicate(HttpMethod.GET); > } > The problem is the return value is null even when controller services exist. > Ultimately, ApplicationResource.java:288 parses a map of http servlet > parameters. The controller service should be a parameter. Yet, this map is > empty. > for (final Map.Entry<String, String[]> entry : > httpServletRequest.getParameterMap().entrySet()) \{ ... } > This problem is preventing the implementation of a Controller Service with > dynamic properties (whose property values are other Controller Services) in a > cluster environment. > -- This message was sent by Atlassian JIRA (v7.6.3#76005)