ObjectId immutability?

From: Gili (cowwo..bs.darktech.org)
Date: Sat Sep 03 2005 - 02:10:18 EDT

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    Hi,

            The implementation of ObjectId caches its hashcode because it says it
    is immutable. Does this mean that when a DataObject is modified in
    memory, it gets assigned a new ObjectId instance? It would be nice to
    mention this somewhere in the Javadoc. This is important because I'm
    wondering what ObjectId.equals() means ... it is important for end-users
    to know whether this simply compares the primary keys, the values of all
    the attributes, etc. Depending on what it does it will have different
    usefulness.

    Thank you,
    Gili 

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