com.alibaba.fastjson.JSONObject cannot be cast to

java.lang.String.

This error occurs when you try to cast an object of type `com.alibaba.fastjson.JSONObject` to a `String` type. In Java, casting is only allowed between compatible types, and a `JSONObject` cannot be directly cast to a `String`.

To resolve this issue, you need to extract the desired value from the `JSONObject` and convert it to a `String`. You can use the `toString()` method provided by the `JSONObject` class to convert the entire object to a `String`. If you want a specific value from the JSON object, you can retrieve it using the appropriate methods provided by the `JSONObject` class and then convert it to a `String`.

Here's an example of how you can extract a value from a `JSONObject` and convert it to a `String`:

com.alibaba.fastjson.JSONObject jsonObject = ...; // your JSONObject

// Get the desired value from the JSONObject
Object value = jsonObject.get("key");

// Convert the value to String
String stringValue = String.valueOf(value);

Make sure to replace `"key"` with the actual key of the value you want to extract from the JSON object.