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From Jason Ferguson <>
Subject Re: OpenJPA and GWT Serialization
Date Sat, 09 Apr 2011 23:18:38 GMT
I'm running with 2.1.0.  I figured if I was going to learn to use JPA
versus Hibernate, I may as well use the most current version.

So let me see if I'm doing this right. I added the following property
to persistence.xml:

<property name="openjpa.DetachState" value="loaded(LiteAutoDetach=true)" />

The docs seem to recommend adding a version field, which I haven't
done yet. I also choose "loaded" versus "fetch-group" because I hadn't
defined any custom fetch groups.

With no offense intended towards the developers, I'm getting the
impression that OpenJPA is currently not the right choice for a GWT
project, until this particular issue is resolved.


On Sat, Apr 9, 2011 at 7:43 AM, Rick Curtis <> wrote:
> Jason -
>> Sorry if this is a frequently asked question.
> This isn't a frequent question... yet. It seems that this issue has come up
> a number of times on users/dev. There was a recent post[1] on a similar
> issue that didn't end with much of a solution. Mike has had this
> detach/proxy business on his list of things he wanted to do for quite a
> time... :-)
> What version of OpenJPA are you running with?
> If you're running 2.0.0 or later and you're in need of a workaround in the
> short term.... and depending on how your application is structured, enabling
> LiteAutoDetach[2] might get you by this problem. The only reason I'm
> suggesting this property as I know that it will remove all proxies on
> EntityManager.close().
> [1]
> [2]
> openjpa.DetachState=loaded(LiteAutoDetach=true)
> Thanks,
> Rick
> On Sat, Apr 9, 2011 at 6:55 AM, Jason Ferguson <>wrote:
>> Sorry if this is a frequently asked question.
>> I have an entity, Location, which has a bidirectional
>> OneToMany/ManyToOne relationship with another entity, BorderPoint.
>> Both entities implement Serializable and IsSerializable.
>> The BorderPoint collection within the Location object is an ArrayList.
>> Unfortunately, OpenJPA uses a proxy class which is not serializable by
>> GWT. I've tried annotating both entities with
>> @DetachedState(enabled=true) with no luck.
>> Can anyone assist?
>> Jason

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