java.util.UUID.fromString not checking length

Question

When I looked into the implementation of java.util.UUID.fromString, I found that it doesn\'t check for the UUID length. Is there any particular reason for this?

Answer 1

The behaviour of UUID.fromString is strange I am not sure if it is a bug or not, but here is what I have been doing to catch those errors.

public class UUIDUtils {
    public static boolean isValid(String uuid){
        if( uuid == null) return false;
        try {
            // we have to convert to object and back to string because the built in fromString does not have 
            // good validation logic.
            UUID fromStringUUID = UUID.fromString(uuid);
            String toStringUUID = fromStringUUID.toString();
            return toStringUUID.equals(uuid);
        } catch(IllegalArgumentException e) {
            return false;
        }
    }
}