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I added the 3.5 milestones update site to upgrade to the latest RC: http://download.eclipse.org/eclipse/updates/3.5milestones/ I got an error message dialog right away. The log shows a couple of exceptions like this: !ENTRY org.eclipse.equinox.p2.core 4 0 2009-05-31 11:57:18.612 !MESSAGE Provisioning exception !STACK 1 org.eclipse.equinox.internal.provisional.p2.core.ProvisionException: No repository found at http://download.eclipse.org/eclipse/updates/3.5milestones/S-3.5M7-200904302300. at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.fail(AbstractRepositoryManager.java:380) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:639) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:88) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepository.addChild(CompositeMetadataRepository.java:146) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepository.<init>(CompositeMetadataRepository.java:101) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepositoryFactory.validateAndLoad(CompositeMetadataRepositoryFactory.java:127) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepositoryFactory.load(CompositeMetadataRepositoryFactory.java:87) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.factoryLoad(MetadataRepositoryManager.java:54) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:667) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:615) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:88) at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProvisioningUtil.loadMetadataRepository(ProvisioningUtil.java:88) at org.eclipse.equinox.internal.p2.ui.model.MetadataRepositoryElement.getMetadataRepository(MetadataRepositoryElement.java:111) at org.eclipse.equinox.internal.p2.ui.model.MetadataRepositoryElement.getRepository(MetadataRepositoryElement.java:105) at org.eclipse.equinox.internal.p2.ui.model.MetadataRepositoryElement.fetchChildren(MetadataRepositoryElement.java:73) at org.eclipse.equinox.internal.p2.ui.model.RemoteQueriedElement.fetchDeferredChildren(RemoteQueriedElement.java:33) at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:234) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55) !SUBENTRY 1 org.eclipse.equinox.p2.metadata.repository 4 1000 2009-05-31 11:57:18.642 !MESSAGE No repository found at http://download.eclipse.org/eclipse/updates/3.5milestones/S-3.5M7-200904302300. And sometime after (can't recall what actions followed) a NPE appeared: !ENTRY org.eclipse.equinox.p2.metadata.repository 4 0 2009-05-31 11:57:19.123 !MESSAGE Unexpected error loading extension: org.eclipse.equinox.p2.metadata.repository.compositeRepository !STACK 0 java.lang.NullPointerException at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.enterLoad(AbstractRepositoryManager.java:323) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:599) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:88) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepository.addChild(CompositeMetadataRepository.java:146) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepository.<init>(CompositeMetadataRepository.java:101) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepositoryFactory.validateAndLoad(CompositeMetadataRepositoryFactory.java:127) at org.eclipse.equinox.internal.p2.metadata.repository.CompositeMetadataRepositoryFactory.load(CompositeMetadataRepositoryFactory.java:87) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.factoryLoad(MetadataRepositoryManager.java:54) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:667) at org.eclipse.equinox.internal.p2.repository.helpers.AbstractRepositoryManager.loadRepository(AbstractRepositoryManager.java:615) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:92) at org.eclipse.equinox.internal.p2.metadata.repository.MetadataRepositoryManager.loadRepository(MetadataRepositoryManager.java:88) at org.eclipse.equinox.internal.provisional.p2.ui.operations.ProvisioningUtil.loadMetadataRepository(ProvisioningUtil.java:88) at org.eclipse.equinox.internal.p2.ui.model.MetadataRepositoryElement.getMetadataRepository(MetadataRepositoryElement.java:111) at org.eclipse.equinox.internal.p2.ui.model.MetadataRepositoryElement.getRepository(MetadataRepositoryElement.java:105) at org.eclipse.equinox.internal.p2.ui.model.MetadataRepositoryElement.fetchChildren(MetadataRepositoryElement.java:73) at org.eclipse.equinox.internal.p2.ui.model.RemoteQueriedElement.fetchDeferredChildren(RemoteQueriedElement.java:33) at org.eclipse.ui.progress.DeferredTreeContentManager$1.run(DeferredTreeContentManager.java:234) at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
BTW: Version: 3.5.0 Build id: I20090515-1143
Note that afterwards the site appeared successfully and I could update Eclipse from RC1 to RC3 using the Nevada site, so this did not block me whatsoever. Just logged this bug in case you guys can figure out what caused it and hopefully fix it, if it is something that can be fixed.
This was fixed >20090519-2000 *** This bug has been marked as a duplicate of bug 276562 ***