java.lang.ClassCastException: java.lang.String cannot be cast to java.util.Date

This error occurs when you try to cast a String object to a Date object, but the String object is not a valid date format.

For example, if you have a String "hello" and try to cast it to a Date object like this:

Date date = (Date) "hello";

You will get a ClassCastException because "hello" is not a valid date format.

To fix this error, you need to make sure that the String object you are trying to cast is a valid date format. You can use a SimpleDateFormat object to parse the String into a Date object like this:

String dateString = "2021-01-01";
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
Date date = dateFormat.parse(dateString);

Now you can safely cast the Date object to a String object without getting a ClassCastException.