How to synchronized TreeView update?

Question

Hello forum,
I'm try to update treeviw @ runtime but i recevid this errorr:
java.util.ConcurrentModificationException
     at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:819)
     at java.util.ArrayList$Itr.next(ArrayList.java:791)
     at com.sun.javafx.collections.ObservableListWrapper$ObservableListIterator.next(Unknown Source)
     at javafx.scene.control.TreeView.getItem(Unknown Source)
     at javafx.scene.control.TreeView.getTreeItem(Unknown Source)
     at javafx.scene.control.TreeCell.updateItem(Unknown Source)
     at javafx.scene.control.TreeCell.access$000(Unknown Source)
     at javafx.scene.control.TreeCell$1.invalidated(Unknown Source)
     at com.sun.javafx.binding.ExpressionHelper$SingleInvalidation.fireValueChangedEvent(Unknown Source)
     at com.sun.javafx.binding.ExpressionHelper.fireValueChangedEvent(Unknown Source)
     at javafx.beans.property.ReadOnlyIntegerWrapper$ReadOnlyPropertyImpl.fireValueChangedEvent(Unknown Source)
     at javafx.beans.property.ReadOnlyIntegerWrapper.fireValueChangedEvent(Unknown Source)
     at javafx.beans.property.IntegerPropertyBase.markInvalid(Unknown Source)
     at javafx.beans.property.IntegerPropertyBase.set(Unknown Source)
     at javafx.scene.control.IndexedCell.updateIndex(Unknown Source)
     at com.sun.javafx.scene.control.skin.VirtualFlow.setCellIndex(Unknown Source)
     at com.sun.javafx.scene.control.skin.VirtualFlow.addTrailingCells(Unknown Source)
     at com.sun.javafx.scene.control.skin.VirtualFlow.layoutChildren(Unknown Source)
     at javafx.scene.Parent.layout(Unknown Source)
     at javafx.scene.Parent.layout(Unknown Source)
     at javafx.scene.Parent.layout(Unknown Source)
     at javafx.scene.Parent.layout(Unknown Source)
     at javafx.scene.Parent.layout(Unknown Source)
     at javafx.scene.Parent.layout(Unknown Source)
     at javafx.scene.Scene.layoutDirtyRoots(Unknown Source)
     at javafx.scene.Scene.doLayoutPass(Unknown Source)
     at javafx.scene.Scene.access$3000(Unknown Source)
     at javafx.scene.Scene$ScenePulseListener.pulse(Unknown Source)
     at com.sun.javafx.tk.Toolkit.firePulse(Unknown Source)
     at com.sun.javafx.tk.quantum.QuantumToolkit.pulse(Unknown Source)
     at com.sun.javafx.tk.quantum.QuantumToolkit$8.run(Unknown Source)
     at com.sun.glass.ui.win.WinApplication._runLoop(Native Method)
     at com.sun.glass.ui.win.WinApplication.access$100(Unknown Source)
     at com.sun.glass.ui.win.WinApplication$2$1.run(Unknown Source)
     at java.lang.Thread.run(Thread.java:722)Is there a way to synchronize update access to observable array list in treeview?
Thanks in avanced,
palban

Answer 1

I have a Listener wich send event to treeview...
public void createMarkers(final MapViewer map, TreeContent treeContent) {
        StateControllerSigletone.getStateController().addMarkerListener(map);
        StateControllerSigletone.getStateController().addMarkerListener(treeContent);
        Task task = new Task() {
            @Override
            protected Object call() throws Exception {
                if (db.connetti()) {
                    String query = "SELECT `country` , `city` , `latitude` , `longitude` "
                            + "FROM `csv` "
                            + "WHERE (`country` = \"US\" OR `country` = \"IT\") "
                            + "ORDER BY  `csv`.`region` DESC "
                            + "LIMIT 0 , 10000";
                    ResultSet rs = db.eseguiQuery(query);
                    try {
                        double lat = 0;
                        double lon = 0;
                        int i = 0;
                        while (rs.next()) {
                            lat = rs.getDouble("latitude");
                            lon = rs.getDouble("longitude");
                            MapMarker marker = new MapMarkerDot(map, lat, lon, rs.getString("country") + ": " + rs.getString("city"));
                            StateControllerSigletone.getStateController().mapMarkerAdded(marker);
                            updateProgress(i++, 10000);
                    } catch (SQLException ex) {
                        Logger.getLogger(NEDiscoverer.class.getName()).log(Level.SEVERE, null, ex);
                    db.disconnetti();
                return true;
        };then, the new Item was addedd...
@Override
    synchronized public void mapMarkerAdded(MapMarker marker) {
        TreeItemMarker item = new TreeItemMarker(marker);
        rootItem.getChildren().add(item);
    }Edited by: palban on 24-mar-2012 5.57