fix bug

cqb-paper/src/main/java/com/qmth/cqb/paper/web/PaperController.java

@@ -85,7 +85,7 @@ public class PaperController {
     @Uac(roles={RoleMeta.QUESTION_ADMIN,RoleMeta.SUPER_ADMIN},policy=UacPolicy.IN)
     @GetMapping(value = "/paper/{paperId}")
     public ResponseEntity getPaperById(@PathVariable String paperId) {
-        return new ResponseEntity(gson.toJson(paperService.getPaperDto(paperId)), HttpStatus.OK);
+        return new ResponseEntity(paperService.getPaperDto(paperId), HttpStatus.OK);
     }
 
     /**