Update fails. This entry in the log:

!ENTRY org.eclipse.update.core 4 0 2007-05-23 09:43:38.433
!MESSAGE Error retrieving "plugins/com.sun.jai.x86.linux_1.0.4593.jar". [Server returned HTTP response code: "404 Not Found" for URL: http://rcp.ncsa.uiuc.edu/updates/plugins/com.sun.jai.x86.linux_1.0.4593.jar.]
!STACK 0
org.eclipse.update.internal.core.FatalIOException: Server returned HTTP response code: "404 Not Found" for URL: http://rcp.ncsa.uiuc.edu/updates/plugins/com.sun.jai.x86.linux_1.0.4593.jar.
at org.eclipse.update.internal.core.UpdateManagerUtils.checkConnectionResult(UpdateManagerUtils.java:560)
at org.eclipse.update.core.ContentReference.getInputSize(ContentReference.java:202)
at org.eclipse.update.core.FeatureContentProvider.asLocalReference(FeatureContentProvider.java:228)
at org.eclipse.update.internal.core.FeaturePackagedContentProvider.retrieveLocalJar(FeaturePackagedContentProvider.java:191)
at org.eclipse.update.internal.core.FeaturePackagedContentProvider.getPluginEntryArchiveReferences(FeaturePackagedContentProvider.java:179)
at org.eclipse.update.internal.operations.UpdateUtils.downloadFeatureContent(UpdateUtils.java:627)
at org.eclipse.update.internal.ui.wizards.InstallWizard2.download(InstallWizard2.java:428)
at org.eclipse.update.internal.ui.wizards.InstallWizard2.access$3(InstallWizard2.java:399)
at org.eclipse.update.internal.ui.wizards.InstallWizard2$3.run(InstallWizard2.java:352)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)