Failed to convert value of type 'java.lang.String' to required type 'java.util.Date';

This error occurs when you try to convert a string value to a date data type in Java, but the string value is not in the correct format or is not a valid date. To fix this error, make sure that the string value is in the correct format for the date data type you are trying to convert it to, or use a try-catch block to handle any exceptions that may occur during the conversion process. Here is an example of converting a string value to a date data type using the SimpleDateFormat class:

String dateString = "2021-01-01";
SimpleDateFormat dateFormat = new SimpleDateFormat("yyyy-MM-dd");
try {
    Date date = dateFormat.parse(dateString);
} catch (ParseException e) {
    // handle exception
}