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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)