Fixed exception handling for minimize json.

Backend/tools-services/src/main/java/com/r11/tools/controller/JsonController.java

@@ -28,7 +28,6 @@ public class JsonController implements RestController {
       JsonObject jsonObject = this.gson.fromJson(request.body(), JsonObject.class);
       response.status(200);
       response.body(this.prettyGson.toJson(jsonObject));
-      System.out.printf(response.body());
     } catch (Exception e) {
       response.status(500);
       Throwable cause = e.getCause();
@@ -37,7 +36,6 @@ public class JsonController implements RestController {
       } else {
         response.body(cause.getMessage());
       }
-      System.out.printf(response.body());
     }
   }
 
@@ -49,7 +47,12 @@ public class JsonController implements RestController {
       response.body(this.gson.toJson(jsonObject));
     } catch (Exception e) {
       response.status(500);
+      Throwable cause = e.getCause();
+      if (cause == null) {
         response.body(e.getMessage());
+      } else {
+        response.body(cause.getMessage());
+      }
     }
   }
 }