Ciao a tutti,

per prima cosa vi saluto, questo è il mio primo post su questo forum che già seguo da tempo, vi chiedo aiuto per un problema che sto incontrando con eclipse.
Paradossalmete mi funziona benissimo con pydev, arduino, c e c++, ma con java nn riesco a capire percè mi da prolemi..

Da Error Log:

Message: Unhandled event loop exception

Exception Stack Trace:
java.lang.NoClassDefFoundError: org/eclipse/jpt/common/utility/internal/StatefulCommandExecutor
at org.eclipse.jpt.jpa.core.JptJpaCorePlugin.buildJpa ProjectManager(JptJpaCorePlugin.java:791)
at org.eclipse.jpt.jpa.core.JptJpaCorePlugin.getJpaPr ojectManager_(JptJpaCorePlugin.java:784)
at org.eclipse.jpt.jpa.core.JptJpaCorePlugin.getJpaPr ojectManager(JptJpaCorePlugin.java:248)
at org.eclipse.jpt.jpa.core.JptJpaCorePlugin.setJavaE lementChangeListenerIsActive(JptJpaCorePlugin.java :716)
at org.eclipse.jpt.jpa.ui.JptJpaUiPlugin.focusOut(Jpt JpaUiPlugin.java:210)
at org.eclipse.jpt.jpa.ui.JptJpaUiPlugin.focusIn(JptJ paUiPlugin.java:187)
at org.eclipse.jpt.jpa.ui.JptJpaUiPlugin$1.handleEven t(JptJpaUiPlugin.java:163)
at org.eclipse.swt.widgets.EventTable.sendEvent(Event Table.java:84)
at org.eclipse.swt.widgets.Display.filterEvent(Displa y.java:1531)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.ja va:1257)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.ja va:1282)
at org.eclipse.swt.widgets.Widget.sendEvent(Widget.ja va:1263)
at org.eclipse.swt.widgets.Control.sendFocusEvent(Con trol.java:3575)
at org.eclipse.swt.widgets.Control.gtk_event_after(Co ntrol.java:2938)
at org.eclipse.swt.widgets.Tree.gtk_event_after(Tree. java:1956)
at org.eclipse.swt.widgets.Widget.windowProc(Widget.j ava:1738)
at org.eclipse.swt.widgets.Control.windowProc(Control .java:5016)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java: 3530)
at org.eclipse.swt.widgets.Display.windowProc(Display .java:4408)
at org.eclipse.swt.internal.gtk.OS._gtk_widget_grab_f ocus(Native Method)
at org.eclipse.swt.internal.gtk.OS.gtk_widget_grab_fo cus(OS.java:12956)
at org.eclipse.swt.widgets.Tree.gtk_button_press_even t(Tree.java:1919)
at org.eclipse.swt.widgets.Widget.windowProc(Widget.j ava:1731)
at org.eclipse.swt.widgets.Control.windowProc(Control .java:5016)
at org.eclipse.swt.widgets.Tree.windowProc(Tree.java: 3530)
at org.eclipse.swt.widgets.Display.windowProc(Display .java:4408)
at org.eclipse.swt.internal.gtk.OS._gtk_main_do_event (Native Method)
at org.eclipse.swt.internal.gtk.OS.gtk_main_do_event( OS.java:8422)
at org.eclipse.swt.widgets.Display.eventProc(Display. java:1245)
at org.eclipse.swt.internal.gtk.OS._g_main_context_it eration(Native Method)
at org.eclipse.swt.internal.gtk.OS.g_main_context_ite ration(OS.java:2276)
at org.eclipse.swt.widgets.Display.readAndDispatch(Di splay.java:3207)
at org.eclipse.ui.internal.Workbench.runEventLoop(Wor kbench.java:2701)
at org.eclipse.ui.internal.Workbench.runUI(Workbench. java:2665)
at org.eclipse.ui.internal.Workbench.access$4(Workben ch.java:2499)
at org.eclipse.ui.internal.Workbench$7.run(Workbench. java:679)
at org.eclipse.core.databinding.observable.Realm.runW ithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWork bench(Workbench.java:668)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(Pl atformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplica tion.start(IDEApplication.java:123)
at org.eclipse.equinox.internal.app.EclipseAppHandle. run(EclipseAppHandle.java:196)
at org.eclipse.core.runtime.internal.adaptor.EclipseA ppLauncher.runApplication(EclipseAppLauncher.java: 110)
at org.eclipse.core.runtime.internal.adaptor.EclipseA ppLauncher.start(EclipseAppLauncher.java:79)
at org.eclipse.core.runtime.adaptor.EclipseStarter.ru n(EclipseStarter.java:344)
at org.eclipse.core.runtime.adaptor.EclipseStarter.ru n(EclipseStarter.java:179)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Nativ e Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Native MethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(De legatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.eclipse.equinox.launcher.Main.invokeFramework( Main.java:622)
at org.eclipse.equinox.launcher.Main.basicRun(Main.ja va:577)
at org.eclipse.equinox.launcher.Main.run(Main.java:14 10)
Caused by: java.lang.ClassNotFoundException: org.eclipse.jpt.common.utility.internal.StatefulCo mmandExecutor
at org.eclipse.osgi.internal.loader.BundleLoader.find ClassInternal(BundleLoader.java:513)
at org.eclipse.osgi.internal.loader.BundleLoader.find Class(BundleLoader.java:429)
at org.eclipse.osgi.internal.loader.BundleLoader.find Class(BundleLoader.java:417)
at org.eclipse.osgi.internal.baseadaptor.DefaultClass Loader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:2 66)
... 52 more


Please aiuto.....


p.s. utilizzo UBUNTU 12.04