We have the following exception, why our query fails?
[ObjectDB 2.6.7_05] Unexpected exception (Error 990)
Generated by Java HotSpot(TM) 64-Bit Server VM 1.8.0_51 (on Windows 7 6.1).
Please report this error on http://www.objectdb.com/database/issue/new
com.objectdb.o.InternalException: null
com.objectdb.o.InternalException
at com.objectdb.o.InternalException.f(InternalException.java:236)
at com.objectdb.o.SPW.an(SPW.java:109)
at com.objectdb.o.PGW.aj(PGW.java:199)
at com.objectdb.o.UPT.C(UPT.java:134)
at com.objectdb.o.URT.l(URT.java:171)
at com.objectdb.o.TSK.i(TSK.java:145)
at com.objectdb.o.TSK.f(TSK.java:95)
at com.objectdb.o.TSM.e(TSM.java:86)
at com.objectdb.o.UTT.A(UTT.java:375)
at com.objectdb.o.UTT.l(UTT.java:223)
at com.objectdb.o.TSK.i(TSK.java:145)
at com.objectdb.o.TSK.f(TSK.java:95)
at com.objectdb.o.MST.Vt(MST.java:1350)
at com.objectdb.o.WRA.Vt(WRA.java:381)
at com.objectdb.o.WSM.Vt(WSM.java:153)
at com.objectdb.o.OBM.bS(OBM.java:984)
at com.objectdb.o.OBM.bP(OBM.java:852)
at com.objectdb.o.OBM.bO(OBM.java:783)
at com.objectdb.o.QRR.f(QRR.java:139)
at com.objectdb.jpa.JpaQuery.getResultList(JpaQuery.java:719)