When a callback of type NameCallback is processed by the handle()
method of com.sun.security.auth.callback.DialogCallbackHandler,
a default JTextField is created for users to input a username
for authentication (for example, when a Krb5LoginModule is used).
That default JTextField is created with 0 columns; which produces
a barely-visible text field in which to type the input.

Note that this bug is similar to CR 4397796 which suffered from the
same problem when PasswordCallbacks were passed in, and which was
fixed in 1.4beta (Merlin).

###@###.### 2005-04-05 17:51:56 GMT