Storing EnumSet in a database?

Question

So in C++/C# you can create flags enums to hold multiple values, and storing a single meaningful integer in the database is, of course, trivial.

In Java you have Enu

Answer 1

EnumSet implements Serializable, but there's a lot of overhead if you use that (it is written as an array of IDs, not a BitSet as you might expect, plus the object stream header.)