Data Migration

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I have opened a ticket regarding database record ids that Mendix generate when inserting from the browser into an entity. Mendix replied that this is beyond support, please if any help is possible. below is the description of the issue. I am trying to avoid using data replication as it will require a lot of microflows to map associations since it hangs when filling association tables for big tables.  TICKET: We have a Mendix application v8.14.1 running on Oracle database that we need to migrate data into directly from a legacy Oracle database, we have created an intermediate database to try on. we provided the mapping between the two databases and inserted the data to the intermediate database, after running Mendix some of the entities are showing the data inserted on the browser but when trying to edit any of them, an error is generated (below). other screens doesn't show the migrated data and raise the same error. as of now, when we update the ID column value from one of the previously created records (from Mendix screens) to one of the migrated records, this record become usable and can be edited on the browser screen (Mendix screen). we are trying to understand the way Mendix is generating IDs and where it reserve the latest value in order to use the same in our SPs. ERROR: java.lang.IllegalArgumentException: Entity id should be not zero at com.mendix.basis.objectmanagement.SchemeManagerImplBase.getObjectType(SchemeManagerImplBase.java:392) at com.mendix.basis.objectmanagement.MendixIdentifier.getObjectType(MendixIdentifier.java:85) at com.mendix.basis.objectmanagement.MendixIdentifier.toString(MendixIdentifier.java:132) at com.mendix.basis.action.user.RetrieveIdListAction.$anonfun$new$4(RetrieveIdListAction.scala:30) at scala.collection.immutable.List.map(List.scala:246) at com.mendix.basis.action.user.RetrieveIdListAction.<init>(RetrieveIdListAction.scala:30) at com.mendix.basis.component.InternalCore.createRetrieveIdListAction(InternalCore.scala:226) at com.mendix.basis.component.InternalCore.retrieveIdList(InternalCore.scala:306) at com.mendix.webui.actions.client.RegularClientActions$.retrieveByIds(RegularClientActions.scala:100) at com.mendix.webui.actions.client.RegularClientActionWiring.$anonfun$regularClientActionMap$6(RegularClientActionWiring.scala:29) at com.mendix.webui.actions.client.RegularClientAction$Helpers$.$anonfun$alwaysSuccess$1(RegularClientAction.scala:25) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.$anonfun$apply$4(RegularClientAction.scala:55) at com.mendix.webui.requesthandling.helpers.StateHandling.withState(StateHandling.scala:35) at com.mendix.webui.requesthandling.helpers.StateHandling.withState$(StateHandling.scala:32) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.withState(RegularClientAction.scala:45) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:53) at com.mendix.webui.actions.client.RegularClientAction$Helpers$StateHandler.apply(RegularClientAction.scala:45) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$3(RegularClientAction.scala:109) at scala.util.Try$.apply(Try.scala:210) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2(RegularClientAction.scala:109) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$2$adapted(RegularClientAction.scala:107) at com.mendix.webui.requesthandling.helpers.ContextHandling.$anonfun$inContext$5(ContextHandling.scala:47) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor(IMonitoredAction.scala:49) at com.mendix.basis.actionmanagement.IMonitoredAction.monitor$(IMonitoredAction.scala:25) at com.mendix.webui.requesthandling.helpers.ContextHandling$ClientMonitoredAction.monitor(ContextHandling.scala:59) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:47) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:27) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext(ContextHandling.scala:24) at com.mendix.webui.requesthandling.helpers.ContextHandling.inContext$(ContextHandling.scala:19) at com.mendix.webui.actions.client.RegularClientAction.inContext(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.$anonfun$execute$1(RegularClientAction.scala:107) at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.scala:18) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest(ProfileHandling.scala:14) at com.mendix.webui.requesthandling.helpers.ProfileHandling.profileRequest$(ProfileHandling.scala:10) at com.mendix.webui.actions.client.RegularClientAction.profileRequest(RegularClientAction.scala:86) at com.mendix.webui.actions.client.RegularClientAction.execute(RegularClientAction.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:104) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:81) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:46) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:76) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:73) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:26) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:79) at com.mendix.basis.impl.MxRuntimeImplBase.processRequest(MxRuntimeImplBase.java:953) at com.mendix.m2ee.appcontainer.server.handler.RuntimeServlet.service(RuntimeServlet.java:42) at javax.servlet.http.HttpServlet.service(HttpServlet.java:790) at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:763) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1631) at org.eclipse.jetty.websocket.server.WebSocketUpgradeFilter.doFilter(WebSocketUpgradeFilter.java:226) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1618) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:549) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1610) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:233) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1369) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:188) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:489) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1580) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:186) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1284) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:141) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:127) at org.eclipse.jetty.server.Server.handle(Server.java:501) at org.eclipse.jetty.server.HttpChannel.lambda$handle$1(HttpChannel.java:383) at org.eclipse.jetty.server.HttpChannel.dispatch(HttpChannel.java:556) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:375) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:272) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:311) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$1.run(ChannelEndPoint.java:104) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:336) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:313) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:171) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:129) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:375) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:806) at org.eclipse.jetty.util.thread.QueuedThreadPool$Runner.run(QueuedThreadPool.java:938) at java.base/java.lang.Thread.run(Thread.java:834)  
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2 answers
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See my forum answer from some time ago on how these ids are generated: https://forum.mendix.com/link/questions/87488

The second part of your question, where these ids are generated and reserved, I am not sure of. My assumption would be the application server.. perhaps somebody else can enlighten us on that part?

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Thank you Ivo for this answer, it’s really helpful

answered