UUID algorithm generating non-unique values sometimes
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Key: OPENJPA-296
URL: https://issues.apache.org/jira/browse/OPENJPA-296
Project: OpenJPA
Issue Type: Bug
Components: sql
Affects Versions: 0.9.7, 0.9.6, 0.9.0
Reporter: Patrick Linskey
Fix For: 1.0.0
>From the dev list:
@Entity
public class Foo {
@Id
@GeneratedValue(strategy=GenerationType.AUTO, generator="uuid-string")
private String id;
}
CREATE TABLE Foo (
id VARCHAR(16) NOT NULL
}
If I do one em.persist() it works just fine. However, if I do a a whole
list of them, I get exceptions (duplicate). If I enable logging I can
see they are all using the same id during INSERT. I stepped a bit
through the code and noticed that uuid-string doesn't get generated
while em.persist(), but much later while committing/flushing. I then
looked a bit (just a bit) at the UUID generator code and noticed that
the bytes are not changing much (maybe only the first two), but again,
that was while debugging, so I'm assuming I have a supa-fast machine.
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