Based on java 15
Swagger URL to test rest API:
http://localhost:8080/swagger-ui/index.html
{ "nestedDemoObjects" : [ { "data": <alphanumeric string> }, ... ] }
{ "nestedDemoObjects": [ { "data": "abc123" } ] }
Response: OK
{ "nestedDemoObjects": [ { "data": "!" } ] }
Response: Bad Request