The following exception occures if we call entityManager.flush() where the corresponding JPA PersistenceContext has many entities and relations. What is the reason for the exception? entityManager.getTransaction().commit() instead of a entityManager.flush() works correctly. Unfortunately I have not found a simple example to reproduce this exception. The entity model of the flushed JPA PersistenceContext is too complex.
[ObjectDB 2.6.0_01] javax.persistence.PersistenceException Failed to read from file 'C:\Users\pg\AppData\Local\Temp\ObjectDB\objectdb_2254766968035459242\ObjectUpdates_2.mrg' (error 117) at com.mycompany.MapApp.run(Unknown Source) at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source) at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source) at java.lang.Thread.run(Unknown Source) Caused by: com.objectdb.o.UserException: Failed to read from file 'C:\Users\pg\AppData\Local\Temp\ObjectDB\objectdb_ 2254766968035459242\ObjectUpdates_2.mrg' at com.objectdb.o.MSG.d(MSG.java:75) at com.objectdb.o.LFL.U(LFL.java:1102) at com.objectdb.o.FIR.o(FIR.java:120) at com.objectdb.o.BYR.B(BYR.java:285) at com.objectdb.o.VUT.k(VUT.java:476) at com.objectdb.o.VUT.j(VUT.java:364) at com.objectdb.o.VUT.j(VUT.java:350) at com.objectdb.o.PRU.aa(PRU.java:212) at com.objectdb.o.VUT.k(VUT.java:689) at com.objectdb.o.VUT.j(VUT.java:364) at com.objectdb.o.VUT.j(VUT.java:350) at com.objectdb.o.FCL.h(FCL.java:110) at com.objectdb.o.VLT.k(VLT.java:149) at com.objectdb.o.UTT.A(UTT.java:355) at com.objectdb.o.UTT.l(UTT.java:203) at com.objectdb.o.TSK.i(TSK.java:145) at com.objectdb.o.TSK.f(TSK.java:95) at com.objectdb.o.MST.ae(MST.java:1442) at com.objectdb.o.MST.Vg(MST.java:1315) at com.objectdb.o.WRA.Vg(WRA.java:381) at com.objectdb.o.WSM.Vg(WSM.java:153) at com.objectdb.o.OBM.bR(OBM.java:976) at com.objectdb.o.OBM.bO(OBM.java:847) at com.objectdb.o.OBM.flush(OBM.java:763) ... 7 more Caused by: java.lang.NullPointerException at com.objectdb.o.LFL.X(LFL.java:1157) at com.objectdb.o.LFL.U(LFL.java:1098) ... 29 more
The same stacktrace also occures in ObjectDb version 2.6.1.