Question

I have this function which returns a datatype InetAddress[]

public InetAddress []
lookupAllHostAddr(String host) throws UnknownHostException {
    Name name = null;

    try {
        name = new Name(host);
    }
    catch (TextParseException e) {
        throw new UnknownHostException(host);
    }

    Record [] records = null;
    if (preferV6)
        records = new Lookup(name, Type.AAAA).run();
    if (records == null)
        records = new Lookup(name, Type.A).run();
    if (records == null && !preferV6)
        records = new Lookup(name, Type.AAAA).run();
    if (records == null)
        throw new UnknownHostException(host);

    InetAddress[] array = new InetAddress[records.length];
    for (int i = 0; i < records.length; i++) {
        Record record = records[i];
        if (records[i] instanceof ARecord) {
            ARecord a = (ARecord) records[i];
            array[i] = a.getAddress();
        } else {
            AAAARecord aaaa = (AAAARecord) records[i];
            array[i] = aaaa.getAddress();
        }
    }
    return array;
}

Eclipse complains that the return type should be byte[][] but when I change the return type to byte[][], it complains that the function is returning the wrong data type. I’m stuck in a loop. Does anyone know what is happening here?

Answer 1

A little research based on lookupAllHostAddr reveals the following:

The sun.net.spi.nameservice.NameService interface was changed
for JDK 6 in a way that makes it impossible for Java source code to
declare a class that can implement either the old or the new version
(the return type of the lookupAllHostAddr method was changed from
byte[][] to InetAddress[]).
Using JDK 6 must fix this!