Issue #2129: Null pointer exception being thrown from within ObjectDB.

EXCEPTION/DESCRIPTION:
------------------------------

[ObjectDB 2.7.1] Unexpected exception (Error 990)

  Generated by Java HotSpot(TM) 64-Bit Server VM 1.8.0_92 (on Windows 10 10.0).
Please report this error on http://www.objectdb.com/database/issue/new
com.objectdb.o.InternalException: java.lang.NullPointerException: null
java.lang.NullPointerException
at com.objectdb.o.VAR.S(VAR.java:297)
at com.objectdb.o.VAR.R(VAR.java:259)
at com.objectdb.o.VAR.aq(VAR.java:637)
at com.objectdb.o.QNF.C(QNF.java:1102)
at com.objectdb.o.QNF.C(QNF.java:996)
at com.objectdb.o.QNF.z(QNF.java:788)
at com.objectdb.o.QNF.k(QNF.java:257)
at com.objectdb.o.QNF.j(QNF.java:134)
at com.objectdb.o.QRC.I(QRC.java:582)
at com.objectdb.o.QRC.z(QRC.java:239)
at com.objectdb.o.QRC.y(QRC.java:188)
at com.objectdb.o.QRM.U9(QRM.java:272)
at com.objectdb.o.MST.U9(MST.java:988)
at com.objectdb.o.WRA.U9(WRA.java:311)
at com.objectdb.o.WSM.U9(WSM.java:115)
at com.objectdb.o.QRR.g(QRR.java:247)
at com.objectdb.o.QRR.f(QRR.java:153)
at com.objectdb.jpa.JpaQuery.getResultList(JpaQuery.java:719)
at za.co.synthesis.regulatory.report.persist.highavailability.ObjectDBTablePersist.readFromSyncpoint(ObjectDBTablePersist.java:95)
at za.co.synthesis.regulatory.report.persist.highavailability.HATable.synchronise(HATable.java:63)
at za.co.synthesis.regulatory.report.persist.highavailability.service.HASync.runHASynchronise(HASync.java:266)
at za.co.synthesis.regulatory.report.support.HousekeepingProcess.runDataSync(HousekeepingProcess.java:67)
at za.co.synthesis.regulatory.report.support.HousekeepingProcess.run(HousekeepingProcess.java:84)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)

SOURCE CODE:
-----------------

...
CriteriaBuilder cb = entityManager.getCriteriaBuilder();
    CriteriaQuery<ReportDownloadObject> q = cb.createQuery(ReportDownloadObject.class);
    Root<ReportDownloadObject> r = q.from(ReportDownloadObject.class);
    q.select(r).
            where(
              cb.and(
                cb.equal(r.get("reportSpace"), reportSpace),
                cb.gt(r.get("objectDbId"), DataLogic.parseLongDef(fromSyncPoint, 0L))
              )
            ).
            orderBy(cb.desc(r.get("objectDbId")));
    TypedQuery<ReportDownloadObject> query = entityManager.createQuery(q);
    List<ReportDownloadObject> reportDownloadObjects = null;
    try {

  *****POINT OF FAILURE***** */
      reportDownloadObjects = query.setMaxResults(maxRecords).getResultList();
...

Screenshots attached for database explorer.  Please note that the "ReportObject" object doesn't seem to write to the database and when trying to view the ReportObject list, the explorer "hangs".

More information is needed regarding ReportDownloadObject and related types.

If possible, please provide a simple test case (preferred format is specified here) or a sample database with a query that can demonstrate the exception (e.g. by running the query in the Explorer).