How can I use the database default time rather than Java supplied time

I've searched over and over and nobody seems to have this issue so maybe its just me!
When inserting a record I would like the a create_date column to automatically use the database time rather than a supplied time via JPA. That was all times a relative to the database which makes sense.
The trouble is I cant figure out how to do this in a sensible manor.
If I specify an column like :
     @Temporal(TemporalType.TIMESTAMP)
     @Column(name = "CREATE_DATE")
     private Date createDate;
and IDL
CREATE_DATE TIMESTAMP WITH TIME ZONE DEFAULT CURRENT_DATE NOT NULL
If I leave createDate null I get an exception. If modify the column to allow Nullable then column is set as Null.
If I leave the column out of the entity bean and then and create a row then the database current time is inserted. The trouble then is that if I want to read the date I'm going to have to create a copy of the bean but with the CREATE_DATE in it, and this doesn't make sense.

I should also mention that TopLink has always supported the ability to retrieve the current time from the database for use in optimistic locking. The TimestampLockingPolicy offers the ability to configure the next value being retrieved from the database instead of using the local time from the JVM. Our extended optimistic locking configuration does not currently support setting this option but it could be done using a descriptor customizer which can be configured in your persistence unit properties.
Using optimistic locking may be a good solution for the last modified date since it will also ensure that you do not corrupt the database if someone else has incremented this value since your last read.
Doug

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