[Opensymphony-oscache] OSCache + Hibernate

Hi,
In the documentation for using the OSCache patch for Hibernate it is said:

NOTE: object identifiers must have well-behaved toString() methods.

What does this mean EXACTLY?
As far as I know the requirements that Hibernate poses are:
1) object id classes must be Serializable
2) you must define a sensible equals() & hascode() for the object class (this is used for comparison by the cache)

So where does this toString() requirement come from? OSCache?

---------------------------------------------------------------------
Posted via Jive Forums
http://forums.opensymphony.com/thread.jspa?threadID=6804&messageID=15146#15146