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From "Mark Struberg (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1873) EntityManager#merge sometimes passes wrong entity values to @PostLoad EntityListeners
Date Thu, 04 Nov 2010 19:58:42 GMT
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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