problems on setting resolver

[<cra...@ya...>]

Hi,
I'm trying to use dnsjava to validate email addresses. But I've got a lot of problems. So I will begin by the first one: how to set my dns servers. 

This is my code:
[code on]

Lookup testl = null;
Record[] records = null;
try {
testl = new Lookup(www.yahoo.com);
records = testl.run();
} catch (TextParseException e) {
System.out.println(e);}

[code off]

I've got a NumberFormatException running this code. When I try to get the default resolver on the lookup, I've got the same error and when I try to set the default resolver either.
I can't find any doc on which system properties I have to set.

I'm sorry , I'm new to all this and maybe my question is stupid. But be kind and please answer me.

Thanks.

Geo.



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