We have, since 2006, been reliant on the Apache JDO project to push forward the JDO standard. Politics have finally become too much for this arrangement, with Oracle involving lawyers to prohibit progress, and the Apache organisation not being as rapid as it should be at getting releases out of the door. I have now forked their API (now present in DN GitHub). The aim is for this repository to be used to develop JDO 4.0 (and maybe later dependent on people's involvement), initially to get a TypeSafe query mechanism into the JDO API (originally contributed back in April 2010!!), and bring the API up to date wrt generics in queries themselves. There are also many other features that were requested in Apache JDO JIRA over the last few years that have been simply left, but are needed.
If you, or your company uses JDO this is your chance to get involved and push it forward to cater for these required features. Do you really want to have to cast the return from your Query to be a List<candidate> etc. You could offer your real-world experience with the JDO API and what you think could be done to make it easier to use.
Should the Apache JDO project "wake up" at some point in the future we could easily enough merge our changes back into their API and discontinue this fork.