Java - "Text 'Oct 11' could not be parsed at index 0"

Question

I am trying to parse a simple DateTime with a different format. This line is just gibing me a hard time:

LocalDate.parse("Oct 11, 2021", DateTimeFormatter.ofPattern("MMM dd, yyyy"))

This is something trivial, why is it not working if I am providing the format?

Answer 1

The exception indicates your system language is not English¹ (so Oct isn't a month name in the default locale). Specify the locale. Like,

LocalDate ld = LocalDate.parse("Oct 11, 2021",
        DateTimeFormatter.ofPattern("MMM dd, yyyy", Locale.US));
System.out.println(ld);

Outputs

2021-10-11

¹_{Your original code worked for me, because my locale is English.}