I'm using Hibernate 3.2.5 and Oracle 10g JDBC against an Oracle 10g DB.

I'm trying to map a legacy table (currently managed through JDBC based DAO) using Hibernate annotations (no other relations at the moment)

My sample class has two "UserType" members:

1) String[] mapped java.sql.Types.ARRAY

2) Custom object mapped to java.sql.Types.STRUCT

The first one behaves as expected: when creating a new object and setting the member a single Insert statement is run against the database when committing.

The second though always triggers an insert followed by an update statement. Both the insert as well as the update statement contain all columns of the table (incl. the "UserType" columns).

Both UserTypes are immutable.

What can be done to avoid running two statements when committing a record? Or could somebody point me towards an explanation of why this is happening?

I have seen a few other people struggling with this but couldn't find a resolution anywhere.

Thanks

I found my mistake: The UserType triggering the additional update statement incorrectly returned null in the deepCopy() method.