Swagger Ui hangs for api endpoint in spring boot - spring-boot

Question

My client api endpoint is not loading in swagger UI as shown in the image what I need to do? It always show loading icon when I click on any client controller api like get,post
Please post answer Thank You
see picture
SwaggerConfig.groovy
#Configuration
#EnableSwagger2
class SwaggerConfig {
#Bean
Docket api() {
return new Docket(DocumentationType.SWAGGER_2)
.select()
.apis(RequestHandlerSelectors.any()
.paths(PathSelectors.any())
.build().apiInfo(metaData())
}
private ApiInfo metaData() {
return new ApiInfoBuilder()
.title("Swagger Example")
.description("\"Swagger configuration for application \"")
.version("1.1.0")
.license("Apache 2.0")
.licenseUrl("https://www.apache.org/licenses/LICENSE-2.0\"")
.build()
}
}
ClientController.groovy
#RestController
#RequestMapping('/client')
class ClientController {
#Autowired
ClientService clientService
#GetMapping('/')
ResponseEntity<List<Client>> getAllClients() {
List<Client> clients = clientService.getAllClients()
return new ResponseEntity<>(clients, HttpStatus.OK)
}
#GetMapping('/{clientId}')
ResponseEntity<Client> getClientById(#PathVariable("clientId") Integer clientId) {
return new ResponseEntity<>(clientService.getClientById(clientId), HttpStatus.OK)
}
#PostMapping('/create')
ResponseEntity<Client> createClient(#RequestBody Client client) {
return new ResponseEntity<>(clientService.addClient(client), HttpStatus.CREATED)
}
#PutMapping('/update/{clientId}')
ResponseEntity<Client> updateClient(#PathVariable("clientId") Integer clientId, #RequestBody Client client) {
clientService.updateClient(client, clientId)
return new ResponseEntity<>(clientService.getClientById(clientId), HttpStatus.OK)
}
#DeleteMapping('/delete/{clientId}')
ResponseEntity<Client> deleteClient(#PathVariable("clientId") Integer clientId) {
clientService.deleteClientById(clientId)
return new ResponseEntity<>(HttpStatus.NO_CONTENT)
}
}