The content type of the interface response is different from the expected one

I have created a JAX-RS for Bizagi to connect @POST @Consumes(MediaType.APPLICATION_JSON) @Produces({MediaType.APPLICATION_JSON}) public TestObj post(TestObj text) { System.out.println("input: "+text.getText()); text.setText("POST: "+ text.getText()); return text; } In "post input parameter" and "post output data" I am using the below JSON as my template {"text":"POST: HIHI"} I have tested my RESTful service with telnet command line and it return me the JSON string successfully POST /HelloJersey/hello HTTP/1.0 Host: 13.186.30.138 Content-Type: application/json Content-Length: 15 {"text":"HIHI"} In the Design Form > "Actions and validation", I have set to execute the interface (to connect the above RESTful method) while a form button is clicked, and then the error message prompted: The content type of the interface response is different from the expected one What JSON format would Bizagi expect me to use? Please advice, thanks.