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Window Builder Design View Problem with SWT [message #1033752]

Thu, 04 April 2013 15:47

Kaloyan Kolev

Messages: 4
Registered: April 2013

Junior Member

I have the latest version of Window Builder Pro installed on my Eclipse 4.2 Juno. When I create a new SWT Application Window, I cannot open the Design view. The code can still be compiled and run, but as soon as I try to open the Design tab a progress bar appears, stops responding after 4-5 seconds, 6-7 seconds after it displays the following error:

Internal Error
WindowBuilder encountered unexpected internal error.

This could be caused by a WindowBuilder bug or by a misconfiguration issue, conflict, partial update, etc.

java.lang.ClassCastException: org.eclipse.swt.widgets.Shell cannot be cast to org.eclipse.swt.widgets.Control

Stack trace:
java.lang.ClassCastException: org.eclipse.swt.widgets.Shell cannot be cast to org.eclipse.swt.widgets.Control
at org.eclipse.wb.os.OSSupport.endShot(OSSupport.java:142)
at org.eclipse.wb.internal.rcp.support.ToolkitSupportImpl.endShot(ToolkitSupportImpl.java:115)
at org.eclipse.wb.internal.swt.support.ToolkitSupport.endShot(ToolkitSupport.java:92)
at org.eclipse.wb.internal.swt.model.widgets.ControlInfo.refresh_fetch(ControlInfo.java:233)
at org.eclipse.wb.internal.swt.model.widgets.ControlInfo.refresh_fetch(ControlInfo.java:157)
at org.eclipse.wb.internal.swt.model.widgets.ControlInfo.refresh_fetch(ControlInfo.java:124)
at org.eclipse.wb.internal.swt.model.widgets.ScrollableInfo.refresh_fetch(ScrollableInfo.java:49)
at org.eclipse.wb.internal.swt.model.widgets.CompositeInfo.refresh_fetch(CompositeInfo.java:301)
at org.eclipse.wb.core.model.ObjectInfo$6$1.run(ObjectInfo.java:496)
at org.eclipse.wb.internal.core.utils.execution.ExecutionUtils.runDesignTime(ExecutionUtils.java:145)
at org.eclipse.wb.core.model.ObjectInfo$6.run(ObjectInfo.java:494)
at org.eclipse.wb.core.model.ObjectInfo.execRefreshOperation(ObjectInfo.java:514)
at org.eclipse.wb.core.model.ObjectInfo.refresh(ObjectInfo.java:492)
at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:580)
at org.eclipse.wb.internal.core.editor.DesignPage.access$9(DesignPage.java:522)
at org.eclipse.wb.internal.core.editor.DesignPage$8$1.run(DesignPage.java:449)
at org.eclipse.swt.widgets.Synchronizer.syncExec(Synchronizer.java:180)
at org.eclipse.ui.internal.UISynchronizer.syncExec(UISynchronizer.java:150)
at org.eclipse.swt.widgets.Display.syncExec(Display.java:4687)
at org.eclipse.wb.internal.core.editor.DesignPage$8.run(DesignPage.java:446)
at org.eclipse.jface.operation.ModalContext.runInCurrentThread(ModalContext.java:464)
at org.eclipse.jface.operation.ModalContext.run(ModalContext.java:372)
at org.eclipse.jface.dialogs.ProgressMonitorDialog.run(ProgressMonitorDialog.java:507)
at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF_withProgress(DesignPage.java:465)
at org.eclipse.wb.internal.core.editor.DesignPage.internal_refreshGEF(DesignPage.java:415)
at org.eclipse.wb.internal.core.editor.UndoManager.refreshDesignerEditor(UndoManager.java:381)
at org.eclipse.wb.internal.core.editor.UndoManager.activate(UndoManager.java:90)
at org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState_True(DesignPage.java:263)
at org.eclipse.wb.internal.core.editor.DesignPage.handleActiveState(DesignPage.java:241)
at org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode.showPage(DefaultMultiMode.java:125)
at org.eclipse.wb.internal.core.editor.multi.DefaultMultiMode$1.widgetSelected(DefaultMultiMode.java:63)
at org.eclipse.swt.widgets.TypedListener.handleEvent(TypedListener.java:248)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
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.notifyListeners(Widget.java:774)
at org.eclipse.swt.custom.CTabFolder.setSelection(CTabFolder.java:3028)
at org.eclipse.swt.custom.CTabFolder.onMouse(CTabFolder.java:1749)
at org.eclipse.swt.custom.CTabFolder$1.handleEvent(CTabFolder.java:278)
at org.eclipse.swt.widgets.EventTable.sendEvent(EventTable.java:84)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.java:1053)
at org.eclipse.swt.widgets.Display.runDeferredEvents(Display.java:4169)
at org.eclipse.swt.widgets.Display.readAndDispatch(Display.java:3758)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine$9.run(PartRenderingEngine.java:1053)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.e4.ui.internal.workbench.swt.PartRenderingEngine.run(PartRenderingEngine.java:942)
at org.eclipse.e4.ui.internal.workbench.E4Workbench.createAndRunUI(E4Workbench.java:86)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:588)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:543)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
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:353)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:180)
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:629)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:584)
at org.eclipse.equinox.launcher.Main.run(Main.java:1438)
at org.eclipse.equinox.launcher.Main.main(Main.java:1414)

The Design tab works fine with Swing GUI.
I have attached the report produced by Eclipse.
Thank you.

Attachment: report-20130404-163714.zip
(Size: 50.97KB, Downloaded 297 times)

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Re: Window Builder Design View Problem with SWT [message #1036449 is a reply to message #1033752]

Mon, 08 April 2013 12:00

Binko Binev

Messages: 20
Registered: June 2012

Junior Member

how does this Shell come there?

Shell e podklas na Control.

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Re: Window Builder Design View Problem with SWT [message #1036455 is a reply to message #1033752]

Mon, 08 April 2013 12:07

Binko Binev

Messages: 20
Registered: June 2012

Junior Member

Vij tova

https://bugs.eclipse.org/bugs/show_bug.cgi?id=387074

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Re: Window Builder Design View Problem with SWT [message #1036604 is a reply to message #1036455]

Mon, 08 April 2013 15:50

Kaloyan Kolev

Messages: 4
Registered: April 2013

Junior Member

Hi Binko

I understand that a subclass cannot be cast to its superclass. What I wanted to know is why Window Builder was trying to do that.

Thank you for the link from which it looks like I need to reinstall JRE.

I na bulgarski, blagodarya.

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Re: Window Builder Design View Problem with SWT [message #1036616 is a reply to message #1036604]

Mon, 08 April 2013 16:02

Binko Binev

Messages: 20
Registered: June 2012

Junior Member

A subclass can be cast to its superclass. it doesn't work the other way.
You can cast a Shell to a Control but not a Control to a Shell.

It also depends how the variable is initiated at first place.

But your problem seems to be with the JRE.

The cast should work.

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Re: Window Builder Design View Problem with SWT [message #1036620 is a reply to message #1036604]

Mon, 08 April 2013 16:05

Binko Binev

Messages: 20
Registered: June 2012

Junior Member

The problem may be that your classes are not correctly loaded so that Control is not correctly loaded as superclass of Shell, so that Shell cannot be cast to it.

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