Eclipse update problem?

Please take 开发者_开发百科a look here:

alt text http://img16.imageshack.us/img16/2810/errrp.jpg

Why i got that error when i'm trying to update my Eclipse Galileo to the newest Eclipse M6 Helios? I'm using the update URL from here:

http://eclipsesource.com/blogs/2010/03/14/eclipse-3-6-m6-helios-available-for-download/

Is this a bug? If not, what can i do?

Please help. Thanks!

Can you try the upgrade process after re-launching eclipse with the -clean option?
Do you confirm you are using the http://download.eclipse.org/eclipse/updates/3.6milestones/ update site address?

What version of eclipse are you using (3.5, 3.5.1, 3.5.2?) and what extra plugin did you installed?

For instance, if you have installed Scala for Eclipse, you could not upgrade AspectJ which could block the upgrade process. (see this thread for illustration)

To summarize the 3-days span and 15 comments below:

An easiest path to solve this would be:

• have a fresh installation of Eclipse, especially the Java EE Helios package (see Helios packages)
• with an eclipse.ini including a -data /path/to/existing workspace
  ( That way, you have 2 Eclipse referencing the same Eclipse projects. You can launch one or the other, and if the new one does not work, you can still revert to the old one. This is safer than trying modifying extensively -- through the update process -- your current Eclipse)
• add the GlassFish plugin for Eclipse
  (download both the plugin and feature jar files, quit Eclipse, then copy the unzipped contents of the first into the plugins directory and the second into the features directory of your Eclipse installation)
• Check you Java EE JDK if needed

And here you go: you should be able to see a GlassFish Server and integrate it as a target runtime there.