insert timestamp upon insert?

[Michael McCutcheon]

Suppose I have a table like this:

CREATE TABLE discussion_thread
(
   discussion_thread_id   INTEGER     NOT NULL GENERATED ALWAYS AS 
IDENTITY (START WITH 1, INCREMENT BY 1),
   title                  VARCHAR(50) NOT NULL,
   creation_date          TIMESTAMP   NOT NULL,
   creator_user_id        VARCHAR(32) NOT NULL
);
Is there a way to have derby automatically populate the creation_date 
column with the current date/time upon insert?

Mike