Hibernate 3.0
MySQL

I have an object which contains a date field named "closedDate".
The field is mapped to a tapestry timestamp field.

Everything works fine if I put data into the date.

However, the business process I am modelling requires that sometimes this date be null. Specifically, if a document is still open, it'll have a closedDate of null.

When I try to save an object with a null closedDate ... it works.

But, when I load it back in, I get a null pointer exception.

Is there a trick to allow nulls in a Date (or any other object field) for that matter? Null strings seem to work fine, but null Dates aren't working for me.

null values for dates should work fine. what's your stack trace?