Re: [platform-swt-dev] Eclipse 3.0 and FormData classcastexception:

[Carolyn MacLeod <Carolyn_MacLeod@xxxxxxxxxx>]

It looks like one (or more) of your
widgets that is inside a GridLayout has a FormData associated with it.
Widgets in a GridLayout must have a
GridData object associated with them - not a FormData object.
When the widgets in your GridLayout
are being analyzed, the following line of code is failing:
        GridData
spec = (GridData) child.getLayoutData();
You will need to make sure that widgets
inside a GridLayout all have a GridData set into them using setLayoutData()
(or don't set anything, which defaults
to a GridData).

I have absolutely no clue how it could
have worked in eclipse 2.1 - the compiler must have been less strict or
something.

Hope this helps.
Carolyn

ram_krishnamurthy@xxxxxxxxxx
Sent by: platform-swt-dev-admin@xxxxxxxxxxx

03/09/2004 10:56 AM

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Subject	[platform-swt-dev] Eclipse 3.0 and FormData classcastexception:

Hello, 

We are trying to run our client which works on eclipse 2.1 to run on eclipse
3.0. With code unchanged in the UI, we get this exception :

java.lang.ClassCastException: org.eclipse.swt.layout.FormData
        at org.eclipse.swt.layout.GridLayout.createGrid(GridLayout.java:430)
        at org.eclipse.swt.layout.GridLayout.computeLayoutSize(GridLayout.java:330)
        at org.eclipse.swt.layout.GridLayout.computeSize(GridLayout.java:376)
        at org.eclipse.swt.widgets.Composite.computeSize(Composite.java:157)
        at org.eclipse.swt.layout.FormLayout.computeSize(FormLayout.java:206)
        at org.eclipse.swt.layout.FormLayout.layout(FormLayout.java:242)
        at org.eclipse.swt.layout.FormLayout.layout(FormLayout.java:235)
        at org.eclipse.swt.widgets.Composite.WM_SIZE(Composite.java:859)
        at org.eclipse.swt.widgets.Control.windowProc(Control.java(Compiled
Code)) 
        at org.eclipse.swt.widgets.Display.windowProc(Display.java(Compiled
Code)) 
        at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native
Method) 
        at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java(Inlined
Compiled Code)) 
        at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java(Compiled
Code)) 
        at org.eclipse.swt.widgets.Control.windowProc(Control.java(Compiled
Code)) 
        at org.eclipse.swt.widgets.Display.windowProc(Display.java(Compiled
Code)) 
        at org.eclipse.swt.internal.win32.OS.EndDeferWindowPos(Native
Method) 
        at org.eclipse.swt.widgets.Composite.resizeChildren(Composite.java:432)
        at org.eclipse.swt.widgets.Composite.resizeChildren(Composite.java:398)
        at org.eclipse.swt.widgets.Composite.setResizeChildren(Composite.java:499)
        at org.eclipse.swt.widgets.Composite.WM_SIZE(Composite.java:862)
        at org.eclipse.swt.widgets.Control.windowProc(Control.java(Compiled
Code)) 
        at org.eclipse.swt.widgets.Display.windowProc(Display.java(Compiled
Code)) 
        at org.eclipse.swt.internal.win32.OS.DefWindowProcW(Native
Method) 
        at org.eclipse.swt.internal.win32.OS.DefWindowProc(OS.java(Inlined
Compiled Code)) 
        at org.eclipse.swt.widgets.Scrollable.callWindowProc(Scrollable.java(Compiled
Code)) 



Any suggestions, anyone seen this problem before. The same code works on
eclipse 2.1. 


-Ram