An exception when deleting objects

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Hi everyone,   In some cases of deleting objects, we've got exception which is very difficult to know the reason. Message: An exception occurred while serializing feedback Track log: org.codehaus.jackson.JsonGenerationException: Can not write a field name, expecting a value at org.codehaus.jackson.impl.JsonGeneratorBase._reportError(JsonGeneratorBase.java:480) at org.codehaus.jackson.impl.WriterBasedGenerator.writeFieldName(WriterBasedGenerator.java:195) at com.mendix.webui.jsonserialization.JsonGeneratorWrapper$$anonfun$writeFieldName$1.apply(JsonGeneratorWrapper.scala:43) at com.mendix.webui.jsonserialization.JsonGeneratorWrapper$$anonfun$writeFieldName$1.apply(JsonGeneratorWrapper.scala:43) at scala.collection.immutable.List.foreach(List.scala:381) at scala.collection.generic.TraversableForwarder$class.foreach(TraversableForwarder.scala:35) at scala.collection.mutable.ListBuffer.foreach(ListBuffer.scala:45) at com.mendix.webui.jsonserialization.JsonGeneratorWrapper.writeFieldName(JsonGeneratorWrapper.scala:43) at com.mendix.webui.jsonserialization.FeedbackSerializer$.serializeFeedback(FeedbackSerializer.scala:17) at com.mendix.webui.jsonserialization.ResultSerializer.serializeFeedback(ResultSerializer.scala:50) at com.mendix.webui.requesthandling.FeedbackHandling$class.processFeedback(FeedbackHandling.scala:54) at com.mendix.webui.requesthandling.ClientRequestHandler.processFeedback(ClientRequestHandler.scala:34) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply$mcV$sp(ClientRequestHandler.scala:352) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:293) at com.mendix.webui.requesthandling.ClientRequestHandler$$anonfun$handleRequest$1.apply(ClientRequestHandler.scala:293) at com.mendix.basis.actionmanagement.IMonitoredAction$$anon$1.execute(IMonitoredAction.scala:47) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:33) at com.mendix.basis.actionmanagement.IMonitoredAction$class.monitor(IMonitoredAction.scala:49) at com.mendix.webui.requesthandling.ClientRequestHandler$ClientMonitoredAction.monitor(ClientRequestHandler.scala:410) at com.mendix.webui.requesthandling.ClientRequestHandler.handleRequest(ClientRequestHandler.scala:293) at com.mendix.webui.requesthandling.ClientRequestHandler.handleActionWithSessionRequired(ClientRequestHandler.scala:235) at com.mendix.webui.requesthandling.ClientRequestHandler.handleAction(ClientRequestHandler.scala:202) at com.mendix.webui.requesthandling.ClientRequestHandler.liftedTree1$1(ClientRequestHandler.scala:101) at com.mendix.webui.requesthandling.ClientRequestHandler.processRequest(ClientRequestHandler.scala:93) at com.mendix.externalinterface.connector.RequestHandler.doProcessRequest(RequestHandler.java:40) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:70) at com.mendix.external.connector.MxRuntimeConnector$1.execute(MxRuntimeConnector.java:67) at com.mendix.util.classloading.Runner.doRunUsingClassLoaderOf(Runner.java:33) at com.mendix.external.connector.MxRuntimeConnector.processRequest(MxRuntimeConnector.java:73) at com.mendix.basis.impl.MxRuntimeImpl.processRequest(MxRuntimeImpl.java:885) at com.mendix.m2ee.appcontainer.server.handler.RuntimeHandler.handle(RuntimeHandler.java:41) at org.eclipse.jetty.server.handler.HandlerList.handle(HandlerList.java:52) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:368) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489) at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:953) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1014) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:861) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240) at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82) at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:628) at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Thread.java:745) and  com.mendix.systemwideinterfaces.MendixRuntimeException: Object access cannot be retrieved. at com.mendix.basis.objectmanagement.SchemeManagerImpl.retrieveAndSetObjectAccess(SchemeManagerImpl.java:1073) Caused by: java.lang.IndexOutOfBoundsException: Index: 0, Size: 0 at java.util.ArrayList.rangeCheck(ArrayList.java:653) at java.util.ArrayList.get(ArrayList.java:429) at com.mendix.connectionbus.data.InternalDataTable.get(InternalDataTable.java:200) at com.mendix.connectionbus.data.InternalDataTable$1.get(InternalDataTable.java:253) at com.mendix.connectionbus.data.InternalDataTable$1.get(InternalDataTable.java:211) at com.mendix.basis.objectmanagement.SchemeManagerImpl.retrieveAndSetObjectAccess(SchemeManagerImpl.java:1070) at com.mendix.basis.objectmanagement.MendixObjectMemberImpl.checkAccessRetrieved(MendixObjectMemberImpl.java:165) at com.mendix.basis.objectmanagement.MendixObjectMemberImpl.hasReadAccess(MendixObjectMemberImpl.java:174) at com.mendix.basis.objectmanagement.MendixObjectImpl.getMembers(MendixObjectImpl.java:88) at com.mendix.webui.requesthandling.HashUtil$.calculateHash(HashUtil.scala:27) at com.mendix.webui.jsonserialization.ResultSerializer.com$mendix$webui$jsonserialization$ResultSerializer$$generateMendixObject(ResultSerializer.scala:138)   Have you have the same problem? And do you know how to fix it?   Best regards,
asked
2 answers
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The first one is probably a follow-up error

org.codehaus.jackson.JsonGenerationException: Can not write a field name, expecting a value

I've experienced that one when e.g. a calculated attribute microflow throws an exception.

The second error looks like a security problem.

It might help to check the client/server traffic.

answered
0

So there is a loop. In the loop, I change the object (remove one association), then delete the object at the end of the loop. For some reason, this flow cause the error. Now I have workaround to not to change the object and delete it, then it works.

But i still don't have proper explanation for the issue.

answered