Environment
ZENworks Configuration Management 2020
Situation
Class Cast Exception trying to publish a report from Jaspersoft Studio to ZENworks Reporting Server.
java.lang.ClassCastException: com.jaspersoft.jasperserver.dto.resources.ClientReference cannot be cast to com.jaspersoft.jasperserver.dto.resources.ClientResource
Resolution
Ensure that the Jaspersoft Studio data connector uses a Username for a ZRS User with sufficient rights to publish.
Additional Information
To confirm try publishing using empty data source will show "Access Denied". The more reasonable error helps to troubleshoot.