default value not null not working as expected

Hi..

I am having trouble with the default value (setting current_timestamp)
in hsql 2.4.1

when I take off the not null from the column, I can see that it is not
populating the column with the default value, so the exception is
valid.

when does the default value get used? thanks in advance!

details:

create table users
(
  id          bigint generated by default as identity(start with 1),
  username varchar(255),
  start_date  timestamp default current_timestamp not null,
  end_date    timestamp
);

insert into users (username, start_date, end_date) values ('jtam', null, null);

integrity constraint violation: NOT NULL check constraint;
SYS_CT_11667 table: USERS column: START_DATE

-joe

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