When the business code is added to the onTrigger of the Processor, the relationship needs to be specified, and the relationship from which the data will flow. The code is as follows
session.transfer(flowFile, REL_SUCCESS);
If not specified, an error message of transfer relationship not specified will be reported.
2. When adding a service to the processor, report No controller service types found that are applicable for this property.
In the nar package where the processor is located, the dependent service is not added in MANIFEST.MF
Nar-Dependency-Id: nifi-XXX-api-nar