EntityManager#merge sometimes passes wrong entity values to @PostLoad
EntityListeners
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Key: OPENJPA-1873
URL: https://issues.apache.org/jira/browse/OPENJPA-1873
Project: OpenJPA
Issue Type: Bug
Components: kernel
Affects Versions: 2.0.1, 2.0.0, 2.0.2
Reporter: Mark Struberg
I've tested this with the latest from branches/2.0.x.
My entity has an @EntityListeners which observes the @PostLoad lifecycle event.
This listener stores the 'old' values from the database for later use (see
http://struberg.wordpress.com/2010/07/31/howto-changelog-with-jpa/ for the
intention behind). All works well if the table has only a few rows. But if you
add more rows, OpenJPA tries to optimize the access and only loads the @Version
field + the dirty fields. In this case the merging seems to be wrong, because I
get the NEW values from the dirty fields instead of the original values from
the database passed to my @PostLoad method.
Did cost me a few grey hairs to track down the differences between the working
and the broken scenarios here ;) But finally I was able to creat a unit test
showing the problem
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