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From Kevin Sutter <>
Subject Re: Newbie: sharing embedded Derby connection
Date Wed, 22 Jul 2009 13:17:49 GMT
Hi Chris,
AFAIK, the embedded derby is limited to a single connection.  If you want to
use multiple connections like this, then you'll have to move to the
client/server derby.  It's almost as simple to setup.  You just need a
different driver.  Maybe you have already figured this out since you have
posted to other forums as well...


On Tue, Jul 21, 2009 at 1:33 PM, Christopher Giblin <>wrote:

> Hi,
> I have  just completed the first  steps with OpenJPA running in my Eclipse
> RCP app. I use Derby with the EmbeddedDriver. So far so good.
> I have another set of plugins, Eclipse Data Tools Project (DTP), which
> provide some DB management tools. However, both OpenJPA and DTP want to own
> the Derby instance. When one has it, the other can not connect which is
> actually to be expected.  When I close the EntityManagerFactory, it frees
> the db. But of course, I want to create that factory just once.
> I realize this is also a Derby question and equally a DTP question (I will
> ask there, too).
> Has anyone had to reconcile this before such that both could the embedded
> Derby?
> Thanks, chris

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