Description Maxime Daniel 2006-01-06 11:28:55 EST

Using build I20051215-1506 under Linux.
Having installed Eclipse into /opt/eclipse_32_M4/eclipse, under root, without
granting write access to it to my usual user id.
The following steps lead to an error (stack trace below):
- connect an launch Eclipse under my usual user id;
- select an update site and a feature that is new for the considered instance
  of Eclipse;
- accept the terms of the license agreement;
- do not change the Install Location, click Finish;
- once the download is complete and presented with the feature verification (here
  I am using an unsigned feature), click Install;
- get an error:

Error 2006-01-06 17:26:26.920 An internal error occurred during: "Update Manager".
java.lang.ClassCastException
at org.eclipse.update.internal.core.SiteFileContentConsumer.abort(SiteFileContentConsumer.java:209)
at org.eclipse.update.internal.core.FeatureExecutableContentConsumer.abort(FeatureExecutableContentConsumer.java:160)
at org.eclipse.update.core.Feature.install(Feature.java:538)
at org.eclipse.update.internal.core.SiteFile.install(SiteFile.java:74)
at org.eclipse.update.internal.core.ConfiguredSite.install(ConfiguredSite.java:122)
at org.eclipse.update.internal.core.ConfiguredSite.install(ConfiguredSite.java:86)
at org.eclipse.update.internal.operations.InstallOperation.execute(InstallOperation.java:72)
at org.eclipse.update.internal.operations.BatchInstallOperation.execute(BatchInstallOperation.java:84)
at org.eclipse.update.internal.ui.wizards.InstallWizard2.install(InstallWizard2.java:373)
at org.eclipse.update.internal.ui.wizards.InstallWizard2.access$1(InstallWizard2.java:370)
at org.eclipse.update.internal.ui.wizards.InstallWizard2$1.run(InstallWizard2.java:464)
at org.eclipse.core.internal.jobs.Worker.run(Worker.java:58)

Adding write access to the directory solves the problem.

Note also that along the Change Install Location path, things are quite
better because Eclipse detects that the installation location is read only, 
and provides a neat message to tell the user so.