Hi

I want to persist a Hashmap. Key and value types are both strings.
This is a basic task for Hibernate and well documented.
The problem comes when the map contains null values. Hibernate will not save key/value pairs when the value is null (key is not null).
When the value is not null it is saved. When I change the value to null and want to save it again, it is deleted. When I insert a record with a null value manually Hibernate will read it with no problem. So reading is ok.

My question: How can I tell Hibernate to save null string values from a Hashmap.

Many thanks for your help

Bruno

Try putting an empty string into the map as the value, rather than null. That works, IIRC.

BTW: You might also try creatinig a UserType, as mentioned here:

http://forum.hibernate.org/viewtopic.php?t=943768