Is there a way to enable debug logs for JaVers so I get more details than this?
JaversException MANAGED_CLASS_MAPPING_ERROR: given javaClass 'class java.lang.Long' is mapped to ValueType, expected ManagedType
The field name would be great to be able to figure out what needs to be mapped differently.
I'm guessing that's the malformed byInstance query. Try the latest version (3.6.2) with improved exception logging.