> Person > - String name > > Template > - String name > - String field1 > - boolean otherBunchOfProperties > > PersonTemplate > - Person person > - Template template
> I want to query all Persons along with their corresponding Template > through PersonTemplate. > Adding the Template property to Person is not an option. At the moment, > we resorted to generating a query per Person to check PersonTemplate > just for prototyping purposes.. but we really have to fix this soon. No idea why you'd contemplate JPQL, it is way less flexible than JDOQL, and always better to stick to Java syntax in Java code IMHO. You don't define the precise query wanted, but suggest that you start from SELECT FROM mydomain.Person WHERE tmpl.person == this VARIABLES mydomain.PersonTemplate tmpl so you can then refer to your associated PersonTemplate object and its "template" field via "tmpl.template", and impose further constraints in the WHERE clause. Should this generate SQL with a different JOIN type to what you would prefer then you can specify the join for the variable as per this page http://www.datanucleus.org/products/accessplatform_4_2/datastores/rdbms_query.html Look for *datanucleus.query.jdoql.{varName}.join* on this page Regards -- Andy DataNucleus (Web: http://www.datanucleus.org Twitter: @datanucleus)