When I use this code:

long l = 8L;
int x = switch (l) {
    case 8L -> 1;
    case 4L -> 2;
    default -> throw new UnsupportedOperationException();
}

I get this error message (copied from jshell):

| Error:
| constant label of type long is not compatible with switch selector type long
| case 8L -> 1;
| ^^
| Error:
| constant label of type long is not compatible with switch selector type long
| case 4L -> 2;
|

This looks like a bug, as I'd expect 'long' to be compatible with 'long'.