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From Michael Dick <>
Subject Re: OpenJPA Date Proxy serialization problem when using entities with GWT
Date Thu, 10 Mar 2011 15:26:08 GMT
Hi Prashant,

I've been looking into the Date proxies recently. What I've found is that
the proxies are removed if you serialize the entity or use detachCopy() (in
this case the original entity retains the proxies and the new copy does not
have them). I'm looking into a better solution for this use case, but the
detachment code is pretty tangled, and it might take a little while to work
out a safe option.

I'm not sure why using a DTO didn't work for you. How did you copy the date
field from your entity?


On Wed, Mar 9, 2011 at 9:13 PM, Prashant Bhat <> wrote:

> Hi All,
> We're developing an application using OpenJpa 2.1, Spring-3.0.5 and
> GWT-2.2.0. This integration works for all other types in the entity, but
> fails for fields of type Date with the following exception:
> --
> Type
> '$util$Date$proxy' was not included in the set
> of types which can be serialized by this SerializationPolicy or its Class
> object could not be loaded. For security purposes, this type will not be
> serialized.: instance = Sat Dec 31 00:00:00 SGT 2011
> --
> I tried using DTO instead of using an entity directly, but when date
> property is copied from Entity object to DTO, the same proxy will be set.
> So
> it doesn't work either.
> When searched, I found lot of references to detaching the entity to remove
> all proxies needed by Jpa. It works, but this needs to be explicitly
> called,
> while the same works without calling this, in our Swing app which gets the
> serialized objects through Spring Remoting. And also, as there're a lot of
> DAOs already written, this is going to be major change.
> So, is there a openjpa configuration setting to use, so that all proxies
> are
> removed on em.close() ? I really appreciate any help to solve this.
> Thanks,
> Prashant

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