linkdHashmap can not cast to JsonObject

It seems like you're trying to cast a `LinkedHashMap` object to a `JsonObject` object, but it's not possible because they are different types.

In Java, `LinkedHashMap` is a class that implements the `Map` interface and stores key-value pairs. On the other hand, `JsonObject` is a class from the JSON library that represents a JSON object.

To convert a `LinkedHashMap` to a `JsonObject`, you can use a JSON library like Gson or Jackson. Here's an example using Gson:

import com.google.gson.Gson;
import com.google.gson.JsonElement;
import com.google.gson.JsonObject;

// Assuming you have a LinkedHashMap instance called 'map'
Gson gson = new Gson();
JsonElement jsonElement = gson.toJsonTree(map);
JsonObject jsonObject = jsonElement.getAsJsonObject();

This code will convert the `LinkedHashMap` to a `JsonElement`, and then you can retrieve a `JsonObject` from it. Make sure you have the Gson library added to your project dependencies.

Note that if the `LinkedHashMap` contains complex objects, you may need to ensure those objects are also properly serialized to JSON.