I started a test of NiFi to GCP with ListGCSBucket processor.
All settings values are used from my Google Account values.
However, when I enabled the GCPCredentialsControllerService, it shows the errors as below:
Failed to invoke@OnEnabled method due to org.apache.nifi.reporting.InitializationException: java.io.lOException: Error reading credentials from stream, 'type' field not specified .java.io.lOException: Error reading credentials from stream, 'type' field not specified
However, from GCP credential json file, only fields are shown below: