[news.eclipse.platform.swt] Table Cell Editor Frustration !!

[steve.x.lane@xxxxxxxxxxxx (steve lane)]

Hi,

I have a table in which the first 2 columns will have a checkbox (created 
dynamically as not all rows will have it).   I have implemented the 
checkbox inside my label provider in the getColumnImage method.

I want the user to be able to click on the rows which have a checkbox and 
toggle its state so i have created CellEditors like this:

CellEditor[] editors = new CellEditor[columns.length];
CellEditor[0] = new CheckboxCellEditor(t);
CellEditor[1] = new CheckboxCellEditor(t);

getOrdersTableViewer().setCellModifier(new CellModifier());		
getOrdersTableViewer().setCellEditors(editors);

But,  when i run my app and click on the first or 2nd column,  I get a 
unhandled loop exception with the following stack trace:

Any ideas what ive done wrong ?  its driving me MENTAL !!! Ive tried to 
single step the code but i just cant work out where it blows up.  If i 
comment out the line setCellModifier,   the exception go's away. but if i 
put breakpoints in my CellModifier,  it never gets called!


java.lang.NullPointerException
	at 
org.eclipse.jface.viewers.TableEditorImpl.activateCellEditor(TableEditorImpl.java:72)
	at 
org.eclipse.jface.viewers.TableEditorImpl.activateCellEditor(TableEditorImpl.java:145)
	at 
org.eclipse.jface.viewers.TableEditorImpl.handleMouseDown(TableEditorImpl.java:271)
	at org.eclipse.jface.viewers.TableViewer$2.mouseDown(TableViewer.java:608)
	at 
org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:133)
	at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:66)
	at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:843)
	at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:3080)
	at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:2713)
	at org.eclipse.ui.internal.Workbench.runEventLoop(Workbench.java:1699)
	at org.eclipse.ui.internal.Workbench.runUI(Workbench.java:1663)
	at 
org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:367)
	at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:143)
	at com.jpmorgan.im.osm.Application.run(Application.java:39)
	at 
org.eclipse.core.internal.runtime.PlatformActivator$1.run(PlatformActivator.java:226)
	at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:376)
	at 
org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:163)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at 
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
	at 
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
	at java.lang.reflect.Method.invoke(Method.java:324)
	at org.eclipse.core.launcher.Main.invokeFramework(Main.java:334)
	at org.eclipse.core.launcher.Main.basicRun(Main.java:278)
	at org.eclipse.core.launcher.Main.run(Main.java:973)
	at org.eclipse.core.launcher.Main.main(Main.java:948)