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Problem

When committing changes to a Cayenne context, you get an exception like the following.

org.apache.cayenne.CayenneRuntimeException:
(v.3.0.1 Sep 06 2010 15:09:38)
Temporary ID hasn't been replaced on commit

Cause

You are trying to commit an object for which Cayenne does not know how to generate a permanent id. This in turn typically happens when the underlying table has no primary key defined.

Solution

To solve the problem, do one of the following.

• Add a primary key to the underlying table, either a surrogate key (new generated id column) or a natural key (combination of existing columns).
• Set your own ObjectID on the object(s) in question using the PersistentObject.setObjectID() method.