JCasc plugin having problem in configuring JiraTestDataPublisher.class

JCasc plugin gives a null pointer exception on line while configuring JiraTestDataPublisher.class

Also while configuring UserFields.class JCasc plugin throws a null pointer exception on line due to link title , because "restClient" object is null.

JiraTestPublisher and many  other descriptors are based on manually written data-binding code, for JiraTestPublisher . (According to ndeloof)