PROBLEMA Problema con Eclipse

[Giovanni Montanaro]

Salve,

Da oggi non riesco ad aprire Eclipse per qualche errore. Per questo volevo reinstallarlo, solo che ora non riesco nemmeno a far partire l'installer di eclipse.

il primo errore è questo:
Intenal Error: Could not initialize class.sun.until.calendar.ZoneInfoFile
java.lang.NoClassDefFoundError: Could not initialize class sun.util.calendar.ZoneInfoFile
at sun.util.calendar.ZoneInfo.getTimeZone(Unknown Source)
at java.util.TimeZone.getTimeZone(Unknown Source)
at java.util.TimeZone.setDefaultZone(Unknown Source)
at java.util.TimeZone.getDefaultRef(Unknown Source)
at java.util.TimeZone.getDefault(Unknown Source)
at java.text.SimpleDateFormat.initializeCalendar(Unknown Source)
at java.text.SimpleDateFormat.<init>(Unknown Source)
at org.eclipse.emf.ecore.impl.EFactoryImpl$SafeSimpleDateFormat.<init>(EFactoryImpl.java:775)
at org.eclipse.emf.ecore.impl.EFactoryImpl.<clinit>(EFactoryImpl.java:793)
at org.eclipse.emf.ecore.EcoreFactory.<clinit>(EcoreFactory.java:29)
at org.eclipse.emf.ecore.util.BasicExtendedMetaData.<clinit>(BasicExtendedMetaData.java:2300)
at org.eclipse.oomph.p2.internal.core.ProfileImpl.<clinit>(ProfileImpl.java:98)
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.createElement(AgentImpl.java:163)
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.createElement(AgentImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap.loadElement(PersistentMap.java:202)
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.loadElement(AgentImpl.java:170)
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.loadElement(AgentImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap$1.handleKey(PersistentMap.java:83)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:243)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:79)
at org.eclipse.oomph.p2.internal.core.AgentImpl.<init>(AgentImpl.java:181)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.createElement(AgentManagerImpl.java:91)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.createElement(AgentManagerImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap.loadElement(PersistentMap.java:202)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.loadElement(AgentManagerImpl.java:82)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.loadElement(AgentManagerImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap$1.handleKey(PersistentMap.java:83)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:243)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:79)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl.<init>(AgentManagerImpl.java:141)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl.<init>(AgentManagerImpl.java:63)
at org.eclipse.oomph.p2.core.P2Util.getAgentManager(P2Util.java:57)
at org.eclipse.oomph.p2.core.P2Util.getCurrentProvisioningAgent(P2Util.java:71)
at org.eclipse.oomph.setup.internal.installer.InstallerApplication.run(InstallerApplication.java:83)
at org.eclipse.oomph.setup.internal.installer.InstallerApplication.start(InstallerApplication.java:408)
at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:203)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:137)
at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:107)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:400)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:255)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:659)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:595)
at org.eclipse.equinox.launcher.Main.run(Main.java:1501)

il secondo errore è questo:
Internal error: class org.eclipse.oomph.p2.internal.core.ProfileImpl
java.lang.reflect.InvocationTargetException
at org.eclipse.oomph.setup.internal.installer.InstallerApplication$6$2.run(InstallerApplication.java:484)
at org.eclipse.jface.operation.ModalContext$ModalContextThread.run(ModalContext.java:122)
Caused by: java.lang.NoClassDefFoundError: Could not initialize class org.eclipse.oomph.p2.internal.core.ProfileImpl
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.createElement(AgentImpl.java:163)
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.createElement(AgentImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap.loadElement(PersistentMap.java:202)
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.loadElement(AgentImpl.java:170)
at org.eclipse.oomph.p2.internal.core.AgentImpl$2.loadElement(AgentImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap$1.handleKey(PersistentMap.java:83)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:243)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:79)
at org.eclipse.oomph.p2.internal.core.AgentImpl.<init>(AgentImpl.java:181)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.createElement(AgentManagerImpl.java:91)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.createElement(AgentManagerImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap.loadElement(PersistentMap.java:202)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.loadElement(AgentManagerImpl.java:82)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl$1.loadElement(AgentManagerImpl.java:1)
at org.eclipse.oomph.p2.internal.core.PersistentMap$1.handleKey(PersistentMap.java:83)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:243)
at org.eclipse.oomph.p2.internal.core.PersistentMap.load(PersistentMap.java:79)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl.<init>(AgentManagerImpl.java:141)
at org.eclipse.oomph.p2.internal.core.AgentManagerImpl.<init>(AgentManagerImpl.java:63)
at org.eclipse.oomph.p2.core.P2Util.getAgentManager(P2Util.java:57)
at org.eclipse.oomph.setup.internal.installer.SelfUpdate.resolve(SelfUpdate.java:122)
at org.eclipse.oomph.setup.internal.installer.InstallerApplication$6$2.run(InstallerApplication.java:465)
... 1 more

Come posso risolvere questi errori e installare correttamente Eclipse ??
Grazie