An error occurred while collecting items to be installed session context was:
(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.Collect, operand=, action=).
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.appengine.eclipse.core_2.3.3.r37v201107211953.jar.
Read timed out
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gdt.eclipse.core_2.3.3.r37v201107211953.jar.
Read timed out
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gdt.eclipse.maven_2.3.3.r37v201107211953.jar.
Read timed out
Unable to read repository at http://dl.google.com/eclipse/plugin/3.7/plugins/com.google.gwt.eclipse.core_2.3.3.r37v201107211953.jar.
Read timed out
I've solved it by downloading the repository from a hidden link:
http://dl.google.com/eclipse/plugin/core/3.7/zips/gpe-e37-latest-updatesite.zip
and updating from there
See the documentation on Google's website .
This is still an issue if you're behind a firewall and have not configured Eclipse to go around it. The link in the accepted answer did not work for me... found ones that did work though.
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