Cannot deserialize value of type `java.time.localdatetime` from string

In Java, the error message “cannot deserialize value of type `java.time.localdatetime` from string” usually occurs when attempting to convert a string value to a LocalDateTime object but encountering an issue during the deserialization process.

LocalDateTime is a class introduced in Java 8 that represents a date and time without a time zone. When deserializing an object from a string, the process involves converting the string representation back into its original object form. However, this error occurs when the string value is incompatible with LocalDateTime’s expected format.

To fix this issue, you need to ensure that the string value being deserialized matches the expected format for LocalDateTime. The format for LocalDateTime can be specified using a DateTimeFormatter object. Below is an example of how to parse a string into a LocalDateTime object using a specific format:

    
import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;

public class Main {
    public static void main(String[] args) {
        String dateString = "2022-01-01T18:30:45";
        DateTimeFormatter formatter = DateTimeFormatter.ofPattern("yyyy-MM-dd'T'HH:mm:ss");
        LocalDateTime dateTime = LocalDateTime.parse(dateString, formatter);
        System.out.println(dateTime);
    }
}
    
  

In the above example, the dateString represents a LocalDateTime in the format “yyyy-MM-dd’T’HH:mm:ss”. The DateTimeFormatter is created with the same format pattern, and the dateString is parsed into a LocalDateTime object using LocalDateTime.parse() method.

Make sure to adjust the format pattern according to the actual format of your string representation of the LocalDateTime.