Webservice Restful retornando HTTP Status 415 - Unsupported Media Type

POST /WSBridgeAsync/webresources/user HTTP/1.1
Host: localhost:8080
Content-Type: application/json
Accept: application/json
Cache-Control: no-cache
Postman-Token: 5e9cd9ea-5e19-1f3a-72e2-8d9571417940

{
   "request":{
      "key":"",
      "attachment":{
         "username":"thiagomoises",
         "firstname":"Thiago Moises",
         "lastname":"G. Oliveira",
         "active":true,
         "familyCollection":[

         ],
         "commandsCollection":[

         ]
      }
   }
}

@POST
@Produces(MediaType.APPLICATION_JSON + "; charset=UTF-8")
@Consumes(MediaType.APPLICATION_JSON + "; charset=UTF-8")
public void Post(Object content){
    System.out.println(content);
}