java - In Eclipse Helios it is impossible to rollback plugin installation -


i have eclipse helios java ee , downloaded pluggins related modeling framework. after java ee aspects lost! anyway not possible uninstall plugins or revert previous installation.
if select plugin , press uninstall get:

an error occurred while uninstalling session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.uninstall, operand=[r]org.eclipse.acceleo.common.source 3.0.1.v201009150438 --> null, action=org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.removesourcebundleaction). org/eclipse/equinox/internal/simpleconfigurator/utils/simpleconfiguratorutils org/eclipse/equinox/internal/simpleconfigurator/utils/simpleconfiguratorutils

if select yesterday's installation , press revert get:

an error occurred while uninstalling session context was:(profile=epp.package.jee, phase=org.eclipse.equinox.internal.p2.engine.phases.uninstall, operand=[r]com.google.collect 0.8.0.v201008251220 --> null, action=org.eclipse.equinox.internal.p2.touchpoint.eclipse.actions.uninstallbundleaction). org/eclipse/equinox/internal/simpleconfigurator/utils/simpleconfiguratorutils org/eclipse/equinox/internal/simpleconfigurator/utils/simpleconfiguratorutils

why can't unistall plugins? issue in helios??

i assume followed :

help => about eclipse => installation detail => installed software tab => , selected product remove - exception acceleo => uninstall....

and yielded error log quote.

so i'd consider 'manual' uninstall.

i've downloaded acceleo v3 update site , looked both plugins , feature folders , artifacts named org.eclipse.acceleo.stuff. confirmed looking content.xml (content.jar)

so, i'd backup eclipse folder, remove acceleo plugins , features, have in workspace .metadata folder corresponding memos (the acceleo name again filter) , restart eclipse -clean.

that should start again. otherwse, goto restore !

as google collection bundle. looks there intervening installation (best interpretation come with, i'm afraid ;-) because can't see google collections jar in acceleo update site.

update
in light of investigation carried out (see comments below), i'd advise fresh installation starting newer stable 3.6sr1 (java ee variant) , progressively re-installing existing plugins (as listed in help => about eclipse => installation detail => installed software) 1 one respective update sites (export preferences old installation, reimport in new). make new installation point on "old" workspace. @ log view (or log in .metadata) find out whether plugins re-installed correctly).


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