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From Marc Prud'hommeaux <>
Subject Re: How to query on interface in OpenJPA
Date Sat, 23 Jun 2007 21:10:06 GMT

According to the spec, "interfaces should not be designated as  
entities", and if you can't declare it as an entity, then you don't  
have anywhere to specify its interface name.

The Kodo JDO layer on top of OpenJPA does support querying on  
interfaces, though. I wonder if it would work if you did "select i  
from com.somepackage.IData i". If that raises an error, can you post  
the stack trace?

On Jun 22, 2007, at 7:08 PM, David Ezzio wrote:

> Hi everyone,
> I've recently run into a bug in Kodo JDO that appears to be  
> occurring in
> OpenJPA. I have a test case that fails in Kodo JDO, but I'm stumped  
> how
> to port the test case to OpenJPA.
> My test case has two data classes and one interface that each class
> implements. SensorData and PublicData are the data classes and  
> IData is
> the interface. The interface and classes are very simple.
> What I need to do is query on the interface, and I don't know how  
> to do
> it.  I don't know how to annotate the interface or whether I  
> should.  I
> don't know how to write the query.  A simple, "select i from IData i"
> would be just fine if it worked.
> Any suggestions?
> Thanks,
> David Ezzio
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