Re: GWT Designer crashes Eclipse when i switch the editor-tab to Design...

Have you tried uninstalling them and reinstalling the GPE w/ the latest and matching GWT Designer? It looks like your install might have left stuff around or didn't fully complete.

Many people have had this kind of issue with the installer in 4.2. Most people recommend just starting with a new Eclipse install completely when you hit this, rather than trying to fix your existing install. 

You may need to export/import your preferences (including external tools, run configs, debug configs, etc that you don't store in .settings) but some of that will come over if you use the same workspace.

On Thursday, May 2, 2013 4:22:49 AM UTC-4, Costis Aivalis wrote:

The GWT-Designer crashes my Eclipse completely.
This problem started, after upgrading from Ubuntu 32bit 12.10 to 32bit 13.04.
Windowbuilder plugin installs and works correctly. It designs even preciser than it did in 12.04.
The GWT plugin for Eclipse 4.2 Juno, on the other hand, installs correctly, allows generating projects with sample code, that run,
but does not allow Designer Editing. I crashes Eclipse.

Here are the error messages. A larger portion of the log file is attached.

!SESSION 2013-05-02 01:49:35.609 -----------------------------------------------
eclipse.buildId=M20130204-1200
java.version=1.7.0_17
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86, WS=gtk, NL=en_US
Framework arguments:  -product org.eclipse.epp.package.jee.product
Command-line arguments:  -os linux -ws gtk -arch x86 -product org.eclipse.epp.package.jee.product

!ENTRY org.eclipse.ui 4 4 2013-05-02 01:51:10.339
!MESSAGE Plug-in 'org.eclipse.jpt.jpa.ui' contributed an invalid Menu Extension (Path: 'org.eclipse.jpt.jpa.ui.menu.JpaTools' is invalid): org.eclipse.jpt.jpa.ui.generateEntities

!ENTRY org.eclipse.ui 4 4 2013-05-02 01:51:50.979
!MESSAGE Could not create action delegate for id: org.eclipse.jdt.debug.ui.actions.ManageBreakpointRulerAction

!ENTRY org.eclipse.equinox.registry 4 1 2013-05-02 01:51:50.979
!MESSAGE Plug-in org.eclipse.wb.core.java was unable to load class org.eclipse.debug.ui.actions.RulerToggleBreakpointActionDelegate.
!STACK 0
java.lang.ClassNotFoundException: org.eclipse.debug.ui.actions.RulerToggleBreakpointActionDelegate

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