I had this problem as well.  It was solved by installing in
increments:

First, install Plugin only (no SDK)
Next, install GWT 2.2 SDK (no App Engine)
Finally, install App Engine SDK

I restarted in between each.

On Feb 17, 5:01 am, Andrew Scully <[email protected]> wrote:
> As I mentioned in my first post, my development machine sits behind a
> corporate firewall. In the past, this has not been a problem as
> certain exceptions are in place for when we use the GWT update site.
>
> For GWT 2.2 however, the firewall still seems to catch the files I
> listed, even though the rest of them download fine. After some
> investigation, it would seem that update files are usually served
> from...
>
> http://commondatastorage.googleapis.com
>
> whereas the files which were failing were being served from...
>
> http://v22.lscache1.c.bigcache.googleapis.com
>
> Furthermore, the redicrection changes over time, googlehosted.
> 1.google.com was metioned by our team.
>
> What I would appreciate, and I suspect I speak for all enterprise
> users of the GWT Eclipse update service when I say this, would be a
> list of firewall exceptions (updated from version to version) to allow
> us to better inform our techincal services providers of any required
> changes prior to running into this kind of issue.
>
> Perhaps, these cases of people making changes (deleting plugins,
> installing on a different day etc.) and having success are actually
> the result of the URL redirections chaging over time? If that is the
> case, the exception info is even more vital.
>
> At the moment, we cannot use the update facility, because it is
> impossible for us to know what IPs to allow.
>
> Thanks for your support, Andrew Scully.
>
> On Feb 16, 3:50 pm, Rajeev Dayal <[email protected]> wrote:
>
>
>
>
>
>
>
> > Andrew,
>
> > If you try and download some of those files (by clicking on the links)
> > through your browser, does it actually work? Do your proxy settings in your
> > browser differ from your proxy settings in Eclipse?
>
> > We'll soon be posting a zipped-up version of the entire update site; maybe
> > you can give that a try.
>
> > Rajeev
>
> > On Mon, Feb 14, 2011 at 5:12 AM, Andrew Scully 
> > <[email protected]>wrote:
>
> > > Using the "Add new software" funtion in eclipse 3.6.0 (Build id:
> > > I20100608-0911), I attempted to install GWT 2.2 from
> > >http://dl.google.com/eclipse/plugin/3.6
>
> > > This operation failed, however, with the below errors. I have numerous
> > > previous versions of GWT installed, including the various milestones
> > > and RCs of 2.1.
>
> > > Is anyone else getting issues like this? If not, it could be a result
> > > of our corporate firewall.
>
> > > An error occurred while collecting items to be installed
> > > session context was:(profile=SDKProfile,
> > > phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=,
> > > action=).
> > > Artifact not found: osgi.bundle,com.google.gdt.eclipse.core,
> > > 2.2.0.v201102111811.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.gdt.eclips...
> > > Artifact not found: osgi.bundle,com.google.gwt.eclipse.core,
> > > 2.2.0.v201102111811.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.gwt.eclips...
> > > Artifact not found: osgi.bundle,com.google.appengine.eclipse.sdkbundle.
> > > 1.4.2,1.4.2.v201102111811.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.appengine....
> > > Artifact not found: osgi.bundle,com.google.gdt.eclipse.designer,
> > > 2.2.0.r36x201102111505.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.gdt.eclips...
> > > Artifact not found: osgi.bundle,com.google.gdt.eclipse.designer.hosted.
> > > 1_6,2.2.0.r36x201102111446.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.gdt.eclips...
> > > Artifact not found: osgi.bundle,com.google.gdt.eclipse.designer.hosted.
> > > 2_0,2.2.0.r36x201102111446.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.gdt.eclips...
> > > Artifact not found: osgi.bundle,com.google.gdt.eclipse.designer.hosted.
> > > 2_0.webkit_win32,2.2.0.r36x201102111446.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.gdt.eclips...
> > > Artifact not found: osgi.bundle,com.google.gwt.eclipse.sdkbundle.
> > > 2.2.0,2.2.0.v201102111811.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/com.google.gwt.eclips...
> > > Artifact not found: osgi.bundle,org.eclipse.wb.core,
> > > 0.9.0.r36x201102111430.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/org.eclipse.wb.core_0...
> > > Artifact not found: osgi.bundle,org.eclipse.wb.core.lib,
> > > 0.9.0.r36x201102111430.
>
> > >http://dl.google.com/eclipse/plugin/3.6/plugins/org.eclipse.wb.core.l...
>
> > > --
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