Description Björn Johansson 2004-02-02 08:43:21 EST

I create a table (with a tableViewer) without a column header. I am using a 
DialogCellEditor.
If I do not set columnProperties (tableViewer.setColumnProperties(String[])) 
there will be an error in the eventDispatch thread (I think) when I click the 
table. If the code looks like this:

Composite iTableViewerComposite = new Composite(permissionsGroup, SWT.NONE);
iTableViewerComposite.setLayout(itvFillLayout);
GridData itGridData = new GridData(GridData.FILL_BOTH);
iTableViewerComposite.setLayoutData(itGridData);
Table instanceTable = new Table(iTableViewerComposite,			
	SWT.H_SCROLL | SWT.V_SCROLL | SWT.BORDER | SWT.MULTI);
TableColumn column = new TableColumn(instanceTable, SWT.LEFT);
		column.setWidth(200);
		instanceTable.setLinesVisible(true);
		instanceTableViewer = new TableViewer(instanceTable);
		instanceTableViewer.setContentProvider(new ArrayContentProvider
());
		instanceTableViewer.setLabelProvider(new 
InstanceTableLabelProvider());
		instanceTableViewer.setCellModifier(
			new InstanceCellModifier(instanceTableViewer));
		instanceTableViewer.setCellEditors(
			new CellEditor[] {
				 new InstanceDialogCellEditor(instanceTable)});
		instanceTableViewer.setInput(populateInstances());

...and I click the table I get an error like this:

java.lang.NullPointerException
	at org.eclipse.jface.viewers.TableViewerImpl.activateCellEditor
(TableViewerImpl.java:61)
	at org.eclipse.jface.viewers.TableViewerImpl.activateCellEditor
(TableViewerImpl.java:134)
	at org.eclipse.jface.viewers.TableViewerImpl.handleMouseDown
(TableViewerImpl.java:231)
	at org.eclipse.jface.viewers.TableViewer$1.mouseDown
(TableViewer.java:320)
	at org.eclipse.swt.widgets.TypedListener.handleEvent
(TypedListener.java:128)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:82)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:847)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:2173)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:1863)
	at org.eclipse.jface.window.Window.runEventLoop(Window.java:583)
	at org.eclipse.jface.window.Window.open(Window.java:563)
	at se.capitalc.prototype.moonraypermission.MoonrayPermissionClient.main
(MoonrayPermissionClient.java:26)

But if I complete the code with:
String[] iColumnNames = {"Instance"};
//... code above
instanceTableViewer.setColumnProperties(iColumnNames);
// Not using columnHeaders!

...it works just fine!

If this is by design, it makes no sense to me in this case or at least it is 
poorly documented(I spent 2 days trying to find out what was wrong)