Editing Support beim JFace TableViewer @ tutorials.de: Tutorials, Forum & Hilfe

HarryXVI · 26.12.11 19:00

Hallo,
ich möchte die Zellen meines JFace TableViewers editierbar machen. Dazu habe ich das Tutorial von Lars Vogel (http://www.vogella.de/articles/Eclip...d/article.html) durchgearbeitet und folgenden Code erstellt.

Code java:

public class ColumnEditingSupport extends EditingSupport {
...
public ColumnEditingSupport(TableViewer tv_viewer, int column) {
        super(tv_viewer);
        this.viewer = tv_viewer;
        this.col_number = column;
    }
    
    @Override
    protected CellEditor getCellEditor(Object element) {
        // TODO Auto-generated method stub
        return new TextCellEditor(viewer.getTable());
    }
 
    @Override
    protected boolean canEdit(Object element) {
        // TODO Auto-generated method stub
        return true;
    }
 
    @Override
    protected Object getValue(Object element) {
        // TODO Auto-generated method stub
        return ((FieldRow) element).getValueAtColumn(col_number);
    }
 
    @Override
    protected void setValue(Object element, Object value) {
        // TODO Auto-generated method stub
        ((FieldRow) element).setValueAtColumn(col_number, (String) value);
        viewer.refresh(element);
    }
}

In einer for-Schleife werden die Spalten des TableViewers erstellt:

Code java:

final int current_col = i;
TableViewerColumn viewerColumn = new TableViewerColumn(viewer, SWT.NONE);
TableColumn column = viewerColumn.getColumn();
column.setText(String.valueOf((char)(i+65)));
column.setWidth(20);
column.setResizable(true);
column.setMoveable(false);
viewerColumn.setLabelProvider(new CellLabelProvider() {
                
    @Override
    public void update(ViewerCell cell) {
        cell.setText( ((FieldRow) cell.getElement()).getValueAtColumn(current_col) );
                }
    });
 
viewerColumn.setEditingSupport(new ColumnEditingSupport(viewer, current_col));

Im Programm lässt sich eine Zelle im TableViewer anklicken und so markieren, als ob man sie editieren könnte. Wenn ich dann jedoch eine Taste drücke (Buchstabe, Zahl, etc.), wirft eclipse folgende Exception:

Code java:

java.lang.NullPointerException
    at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.isPartialMatch(KeyBindingDispatcher.java:478)
    at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.press(KeyBindingDispatcher.java:505)
    at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.processKeyEvent(KeyBindingDispatcher.java:563)
    at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.filterKeySequenceBindings(KeyBindingDispatcher.java:374)
    at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher.access$0(KeyBindingDispatcher.java:321)
    at org.eclipse.e4.ui.bindings.keys.KeyBindingDispatcher$KeyDownFilter.handleEvent(KeyBindingDispatcher.java:82)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1062)
    at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1104)
    at org.eclipse.swt.widgets.Text.sendKeyEvent(Text.java:1455)
    at org.eclipse.swt.widgets.Widget.sendKeyEvent(Widget.java:1100)
    at org.eclipse.swt.widgets.Widget.wmChar(Widget.java:1509)
    at org.eclipse.swt.widgets.Control.WM_CHAR(Control.java:4640)
    at org.eclipse.swt.widgets.Text.WM_CHAR(Text.java:2259)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4528)
    at org.eclipse.swt.widgets.Text.windowProc(Text.java:2254)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4972)
    at org.eclipse.swt.internal.win32.OS.DispatchMessageW(Native Method)
    at org.eclipse.swt.internal.win32.OS.DispatchMessage(OS.java:2531)
    at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3752)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:969)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:885)
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:90)
    at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:145)
    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)
java.lang.NullPointerException
    at org.eclipse.e4.ui.internal.workbench.swt.ShellActivationListener.getShellContext(ShellActivationListener.java:193)
    at org.eclipse.e4.ui.internal.workbench.swt.ShellActivationListener.activate(ShellActivationListener.java:114)
    at org.eclipse.e4.ui.internal.workbench.swt.ShellActivationListener.handleEvent(ShellActivationListener.java:73)
    at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
    at org.eclipse.swt.widgets.Display.filterEvent(Display.java:1262)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1052)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1077)
    at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1058)
    at org.eclipse.swt.widgets.Decorations.WM_ACTIVATE(Decorations.java:1647)
    at org.eclipse.swt.widgets.Shell.WM_ACTIVATE(Shell.java:2137)
    at org.eclipse.swt.widgets.Control.windowProc(Control.java:4525)
    at org.eclipse.swt.widgets.Canvas.windowProc(Canvas.java:341)
    at org.eclipse.swt.widgets.Decorations.windowProc(Decorations.java:1610)
    at org.eclipse.swt.widgets.Shell.windowProc(Shell.java:2061)
    at org.eclipse.swt.widgets.Display.windowProc(Display.java:4972)
    at org.eclipse.swt.internal.win32.OS.BringWindowToTop(Native Method)
    at org.eclipse.swt.widgets.Decorations.bringToTop(Decorations.java:230)
    at org.eclipse.swt.widgets.Shell.open(Shell.java:1217)
    at org.eclipse.jface.window.Window.open(Window.java:797)
    at org.eclipse.jface.dialogs.ErrorDialog.open(ErrorDialog.java:360)
    at org.eclipse.e4.ui.internal.workbench.swt.WorkbenchStatusReporter.openDialog(WorkbenchStatusReporter.java:97)
    at org.eclipse.e4.ui.internal.workbench.swt.WorkbenchStatusReporter.report(WorkbenchStatusReporter.java:54)
    at org.eclipse.e4.core.services.statusreporter.StatusReporter.show(StatusReporter.java:132)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.safeHandle(PartRenderingEngine.java:1006)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.handle(PartRenderingEngine.java:990)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:978)
    at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
    at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:885)
    at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:90)
    at org.eclipse.e4.ui.internal.workbench.swt.E4Application.start(E4Application.java:145)
    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)

NullPointerExceptions sind mir nicht neu, aber in diesem Kontext kann ich überhaupt nichts damit anfangen. Weiß jemand Rat? Ich bin für eure Hilfe sehr dankbar.

genodeftest · 26.12.11 20:37

Klingt nach nem Bug in Eclipse. Wenn du die aktuellste Version von Eclipse verwendest, solltest du es mal unter https://bugs.eclipse.org/bugs/ melden.

EDIT: Zur Erklärung: In dem Stacktrace findet sich offensichtlich keine von dir erstellte Methode oder Klasse, damit hat irgend ein Teil der Eclipse-API den Fehler selbst erzeugt oder von dir übergebene Daten nicht ausreichend geprüft. Hast du irgend etwas an den Key Bindings gesetzt?

PS: probier doch erst mal, ob es sich evtl. um einen Konfigurationsfehler handelt, indem du deine Eclipse-Anwendung mal auf einen neuen „workspace“ loslässt und sicherstellst, dass diese Exception dort auch auftritt.

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