I have installed Jaspersoft Server 6.4 and added the Web Servie Data Source plugin afterwards. When I create a new data source, i can see the "Web Service Data Source" entry in the drop-down. This is how I filled it out: After creating the Data Source, i was trying to use this DS in a Domain, so I started to create a domain. When I created the Domain and hit the Save button, i got the below error message: When I clicked the Create with Doamin Designer ... link within the same window, i got the below exception: Do you have a guess, what can be the problem? It looks for me that the Web Service Data Source does not like the JSON format, because it tries to use an XML parser (second screenshot).