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From "Rick Curtis (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1770) Inconsistent behaviour when fetching an Entity that has a null embeddable and the DataCache is enabled
Date Thu, 19 Aug 2010 14:33:15 GMT
Inconsistent behaviour when fetching an Entity that has a null embeddable and the DataCache
is enabled
------------------------------------------------------------------------------------------------------

                 Key: OPENJPA-1770
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1770
             Project: OpenJPA
          Issue Type: Bug
    Affects Versions: 2.1.0
            Reporter: Rick Curtis
            Assignee: Rick Curtis


While investigating the failures for OPENJPA-1469 I found that when the DataCache is enabled
we behave differently when finding an Entity that has an empty/null embeddable. Take the following
domain model:

@Entity
class A{
  @Id
  int id;
  @Embeddable
  Emb emb;
...
}

@Embeddable
class Emb{
....
}

The scenario where this is observed is when the datacache is not enabled and I persist Entity
[A] with a null Emb. In a new persistence context I search for that same Entity, Emb is now
an empty embeddable. In that same case when the datacache is enabled the find operation returns
an Entity with a null embeddable. This is because the DataCache knows that Emb is null, when
the data is retrieved from the database we don't know if it should be null or empty.

The datacache behavior is probably more correct, but it is inconsistent with the non-datacache
behavior. Since the datacache is supposed to be transparent to the application I am going
to make this two cases operate in the same manner. I asked posted this observation to the
dev mailing list[1] but didn't receive any responses.

[1] http://openjpa.markmail.org/thread/xyytunrvcciv5ura

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