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This happens when the number of "ad hoc" anchors is > 1. In AnchorUtil#deleteEmptyAdHocAnchors() just reverse the lower and upper bounds in the first "for" like so: Was: for (int i = 0; i < s.getAnchors().size(); i++) Should be: for (int i = s.getAnchors().size()-1; i >= 0; --i) Stack trace follows: org.eclipse.emf.common.util.BasicEList$BasicIndexOutOfBoundsException: index=6, size=6 at org.eclipse.emf.common.util.BasicEList.get(BasicEList.java:352) at org.eclipse.bpmn2.modeler.core.utils.AnchorUtil.deleteEmptyAdHocAnchors(AnchorUtil.java:398) at org.eclipse.bpmn2.modeler.core.utils.AnchorUtil.updateEdge(AnchorUtil.java:355) at org.eclipse.bpmn2.modeler.core.utils.AnchorUtil.reConnect(AnchorUtil.java:327) at org.eclipse.bpmn2.modeler.core.features.DefaultBpmnMoveFeature.postMoveShape(DefaultBpmnMoveFeature.java:33) at org.eclipse.bpmn2.modeler.core.features.MoveFlowNodeFeature.postMoveShape(MoveFlowNodeFeature.java:85) at org.eclipse.graphiti.features.impl.DefaultMoveShapeFeature.moveShape(DefaultMoveShapeFeature.java:66) at org.eclipse.graphiti.internal.command.MoveShapeFeatureCommandWithContext.execute(MoveShapeFeatureCommandWithContext.java:81) at org.eclipse.graphiti.internal.command.CommandContainer.execute(CommandContainer.java:81) at org.eclipse.graphiti.ui.internal.command.GefCommandWrapper.execute(GefCommandWrapper.java:51) at org.eclipse.graphiti.ui.internal.editor.EmfOnGefCommand.execute(EmfOnGefCommand.java:59) at org.eclipse.graphiti.internal.command.GFPreparableCommand2.doExecute(GFPreparableCommand2.java:37) at org.eclipse.emf.transaction.RecordingCommand.execute(RecordingCommand.java:135) at org.eclipse.emf.workspace.EMFCommandOperation.doExecute(EMFCommandOperation.java:119) at org.eclipse.emf.workspace.AbstractEMFOperation.execute(AbstractEMFOperation.java:150) at org.eclipse.core.commands.operations.DefaultOperationHistory.execute(DefaultOperationHistory.java:513) at org.eclipse.emf.workspace.impl.WorkspaceCommandStackImpl.doExecute(WorkspaceCommandStackImpl.java:208) at org.eclipse.emf.transaction.impl.AbstractTransactionalCommandStack.execute(AbstractTransactionalCommandStack.java:165) at org.eclipse.graphiti.ui.internal.editor.GFWorkspaceCommandStackImpl.execute(GFWorkspaceCommandStackImpl.java:71) at org.eclipse.graphiti.ui.internal.editor.GFCommandStack.execute(GFCommandStack.java:108) at org.eclipse.gef.tools.AbstractTool.executeCommand(AbstractTool.java:425) at org.eclipse.gef.tools.AbstractTool.executeCurrentCommand(AbstractTool.java:438) at org.eclipse.gef.tools.DragEditPartsTracker.performDrag(DragEditPartsTracker.java:496) at org.eclipse.gef.tools.DragEditPartsTracker.handleButtonUp(DragEditPartsTracker.java:351) at org.eclipse.gef.tools.AbstractTool.mouseUp(AbstractTool.java:1200) at org.eclipse.gef.tools.SelectionTool.mouseUp(SelectionTool.java:574) at org.eclipse.gef.EditDomain.mouseUp(EditDomain.java:301) at org.eclipse.gef.ui.parts.DomainEventDispatcher.dispatchMouseReleased(DomainEventDispatcher.java:380) at org.eclipse.draw2d.LightweightSystem$EventHandler.mouseUp(LightweightSystem.java:548) at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:219) at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84) at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053) at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4165) at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3754) at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:2696) at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:2660) at org.eclipse.ui.internal.Workbench.access$4(Workbench.java:2494) at org.eclipse.ui.internal.Workbench$7.run(Workbench.java:674) at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332) at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:667) at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149) at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:123) at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110) at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:344) at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:622) at org.eclipse.equinox.launcher.Main.basicRun(Main.java:577) at org.eclipse.equinox.launcher.Main.run(Main.java:1410) at org.eclipse.equinox.launcher.Main.main(Main.java:1386)
