Inconsistent behaviour when fetching an Entity that has a null embeddable and
the DataCache is enabled
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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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