java.net.Authenticator with proxy -- does it work ???

[Elwood P. Dowd]

I've tried coding a java program to use java.net.Authenticator to
tunnel through a proxy server, and it keeps failing with an HTTP 407
(authentication failed).

Using:
- jdl 1.4.2

I instantiated my authenticator class (not shown) and registered it
using:
MyAuthenticator ma = new MyAuthenticator();
Authenticator.setDefault(ma);

My MyAuthenticator class has the requisite getPasswordAuthentication()
method.

But getPasswordAuthentication() never gets invoked ?

I know my proxy serer requires a userid/password.

But I get an IOException and MyAuthentication never seems to get
invoked ??

Does anyone have a clue ?