This morning when I opened my Eclipse workspace, one of my RCP projects had problems with its build paths. On the 'libraries' property page, the entry that is normally called 'Plug-in Dependencies' was labelled 'org.eclipse.pde.core.requiredPlugins (unbound)' and the container was empty. After much experimenting, I discovered I could fix the problem by closing and re-opening the project, followed by a 'clean'.
My workbench showed errors on start-up:
Error 2006-01-12 08:07:48.184 An internal error occurred during: "Initializing Java tooling".
java.lang.NullPointerException
at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:229)
at org.eclipse.wst.common.internal.emf.resource.TranslatorResourceImpl.setID(TranslatorResourceImpl.java:310)
...[snip]...
Error 2006-01-12 08:07:48.169 Problems occurred when invoking code from plug-in: "org.eclipse.core.resources".
java.lang.ArrayIndexOutOfBoundsException: 4
at org.eclipse.emf.common.notify.impl.BasicNotifierImpl.eNotify(BasicNotifierImpl.java:229)
at org.eclipse.emf.common.notify.impl.NotificationImpl.dispatch(NotificationImpl.java:931)
at org.eclipse.wst.common.componentcore.internal.impl.ComponentResourceImpl.setComponent(ComponentResourceImpl.java:216)
at org.eclipse.wst.common.componentcore.internal.impl.ResourceTreeNode.findMatchingVirtualPathsSet(ResourceTreeNode.java:210)
...[snip]...
Warning 2006-01-12 08:07:39.347 A workspace crash was detected. The previous session did not exit normally.
although as far as I can remember the previous session did exit normally.
