DataNucleus JIRA is now in read-only mode. Raise any new issues in GitHub against the plugin that it applies to.
DataNucleus JIRA will remain for the foreseeable future but will eventually be discontinued
Apache Isis (http://isis.apache.org) integrates with DataNucleus, and requires to be notified of each object as it is instantiated by DN when being recreated as 'hollow'. This is done by the JDOStateManager.