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java.lang.NullPointerException: 	at org.apache.isis.objectstore.jdo.datanucleus.service.support.TimestampService.close(TimestampService.java:48)	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)	at java.lang.reflect.Method.invoke(Method.java:483)	at org.apache.isis.core.commons.lang.MethodExtensions.invoke(MethodExtensions.java:53)	at org.apache.isis.core.commons.lang.MethodExtensions.invoke(MethodExtensions.java:47)	at org.apache.isis.core.runtime.services.ServiceInstantiator.callPreDestroyIfPresent(ServiceInstantiator.java:277)	at org.apache.isis.core.runtime.services.ServiceInstantiator$2.invoke(ServiceInstantiator.java:195)	at org.apache.isis.objectstore.jdo.datanucleus.service.support.TimestampService_$$_jvst8a_5.__isis_preDestroy(TimestampService_$$_jvst8a_5.java)	at org.apache.isis.core.runtime.system.transaction.IsisTransactionManager.endRequestOnRequestScopeServices(IsisTransactionManager.java:331)	at org.apache.isis.core.runtime.system.transaction.IsisTransactionManager.endTransaction(IsisTransactionManager.java:514)	at org.apache.isis.core.runtime.system.transaction.IsisTransactionManager.executeWithinTransaction(IsisTransactionManager.java:218)	at org.apache.isis.core.runtime.transaction.facets.ActionInvocationFacetWrapTransaction.invoke(ActionInvocationFacetWrapTransaction.java:59)	at org.apache.isis.core.metamodel.specloader.specimpl.ObjectActionDefault.execute(ObjectActionDefault.java:363)	at org.apache.isis.core.wrapper.handlers.DomainObjectInvocationHandler.handleActionMethod(DomainObjectInvocationHandler.java:625)	at org.apache.isis.core.wrapper.handlers.DomainObjectInvocationHandler.invoke(DomainObjectInvocationHandler.java:260)	at org.apache.isis.core.wrapper.proxy.ProxyCreator$1.invoke(ProxyCreator.java:72)	at sales.dom.backend.SupplierRepository_$$_jvst8a_b.theSupplierSupplier(SupplierRepository_$$_jvst8a_b.java)	at sales.dom.Supplier.SupplierProductService.upsertProductFromSupplier(SupplierProductService.java:61)	at sales.fixture.Supplier.UpsertAllProductsFromSupplier.lambda$0(UpsertAllProductsFromSupplier.java:28)