[news.eclipse.webtools] Re: AssertionFailed exception when opening JavaS

[Nitin Dahyabhai <nitind@xxxxxxxxxx>]

Marcus Better wrote:
> when I try to open a JavaScript file, I occasionally get an error dialog saying "Multiple problems have occurred", "org.eclipse.core.runtime.AssertionFailedException", and "null argument:" in the Details box. At other times it works fine. What should I do about this?
>
> My project is a Grails project, and I've added JavaScript support with the "Web Development Tools -> Add JavaScript support" command from project's context menu.
>
> I'm running the Ganymede M7 package of Eclipse for Java EE on Linux x86_64, Sun JDK 6.
>
> Log output follows.
>
> Cheers,
>
> Marcus
>
> !ENTRY org.eclipse.ui 4 0 2008-05-21 15:07:00.631
> !MESSAGE Unable to create editor ID org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart: No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart
> !STACK 1
> org.eclipse.ui.PartInitException: No editor descriptor for id org.eclipse.wst.javascript.ui.internal.editor.JSMultiPageEditorPart

It looks like you're reusing a workspace from an earlier release. 
Eclipse remembers the ID of the last editor you used to open a file, 
so you'd see this on files you opened in prior releases but not on 
files that you never opened before.  With the massive Javascript 
retooling that is in the 3.0 builds, the old editor just isn't 
around any more.  Use the file's context menu's "Open With" submenu 
to choose the new editor.

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Nitin Dahyabhai
Eclipse WTP Source Editing
IBM Rational