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From Miłosz Tylenda <mtyle...@o2.pl>
Subject Re: @Version
Date Mon, 28 Sep 2009 16:35:27 GMT
Good morning!/Good evening!

I would add that it might also be beneficial to know whether entities are enhanced during
runtime (aka subclassing) or build time/by javaagent.

Regards,
Milosz


> 
> Good morning!
> 
> Couple questions.  When you fetch the entity with the getById() call, are
> you:
>    1) Modifying any of its persistent fields?
>    2) Establishing a write-lock? (by API action or configured default
> behavior)
> 
> If you're just fetching data, without mutating it and without any
> write-locks, then there is some sort of problem which would need to be
> addressed.
> 
> As for the Exception, 
> org.apache.openjpa.persistence.OptimisticLockException, being thrown, the
> javadoc at
> http://openjpa.apache.org/builds/1.2.1/apache-openjpa-1.2.1/docs/javadoc/index.html
> states that org.apache.openjpa.persistence.OptimisticLockException extends
> javax.persistence.OptimisticLockException, so a catch block for
> javax.persistence.OptimisticLockException will still catch it.
> 
> 
> verkehr wrote:
> > 
> > I'm using openejb 3.1.1 with includes openjpa. I'm annotating an Integer
> > field with "@Version". 
> > Every time I'm querying a row (e.g. calling "ejb.getById()") will cause an
> > update of the row with a new version! A call to "ejb.getAll()" (which
> > retrieves all rows as a java.util.List) updates all rows with a new
> > version number!!
> > In my opinion nn update of the version field (column) should only occur
> > calling "persist()". - Hibernate does so! JPA specification chapter 3.4.
> > says it too.
> > 
> > Is there a parameter to set that changes this behaviour.
> > 
> > Further, openjpa throws an
> > org.apache.openjpa.persistence.OptimisticLockException and not
> > javax.persistence.OptimisticLockException
> > Why? This prohibits protability. Hibernate throws
> > javax.persistence.OptimisticLockException
> > -- 
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> > 
> > 
> 
> -- 
> View this message in context: http://n2.nabble.com/Version-tp3728033p3730214.html
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> 

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