Hi Ekko, Since you're somewhat off "the beaten track", it's a little difficult to give concrete advice. In short, I don't know if your configuration is wrong.
The IsisJdoSupport service provides only a very thin layer on top of DN's PersistenceManager, and we don't expose every API. It's quite possible for your use case you need to call the DN APIs differently to the way that IsisJdoSupport calls them. What I recommend you do is use IsisJdoSupport#getPersistenceManager() [1] to access the underlying DN PM, then construct your query directly. At least that then eliminates Isis. Andy Jefferson, who maintains DN, may be able to help, though he's pretty strict about wanting a test case that demonstrates the issue. Once you've figured out what DN API needs to be called, we can look to providing better support for it within Isis. Hope that helps a little Dan [1] https://github.com/apache/isis/blob/master/core/applib/src/main/java/org/apache/isis/applib/services/jdosupport/IsisJdoSupport.java#L61 On Fri, 29 Sep 2017 at 11:34 赵 敏 <[email protected]> wrote: > Hi support, > > Its me again! > > My Isis version is 1.14.0, thanks for the help. Now we used DN's data > federation to managed multiple databases. > > But there are some exceptions here, that's > org.datanucleus.exceptions.NucleusException: Not yet supported for queries > with unknown candidate. > > Then I went to track the source code，I found the > org.apache.isis.core.runtime.system.persistence.PersistenceSession.newJdoQuery(Class<?> > cls) used org.datanucleus.api.jdo.JDOPersistenceManager.newQuery(Class cls) > to create javax.jdo.Query, > and then execute > org.datanucleus.api.jdo.JDOPersistenceManager.newQuery()，that's invoke > newQuery("javax.jdo.query.JDOQL", null). > > Now,variable query is null,when invoke > org.datanucleus.store.federation.FederatedQueryManagerImpl.newQuery(String > language, ExecutionContext ec, Object query) will throw new > NucleusException("Not yet supported for queries with unknown candidate"). > > Is my configuration wrong? > > Ekko. > >
