I have to copy data from a set of tables on one DB to a set of identical tables on another. I already have hibernate objects for these tables, and wish to reuse them. Is there an easy way to pull the data from the source into the objects and them save them to the destination?

Try this.

Create session for DB1 (source)
Create session for DB2 (destination)
Query session of DB1 for objects (preferable some kind of root object)
Call save of session of DB2

Just keep the memory usage in mind. This might load the entire DB in memory before saving in the other. Might wanna do it an object at a time.