The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes

eclipse.buildId=I20100608-0911

java.version=1.6.0_18

java.vendor=Sun Microsystems Inc.

BootLoader constants: OS=win32, ARCH=x86, WS=win32, NL=zh_CN

Framework arguments: -product org.eclipse.epp.package.jee.product

Command-line arguments: -os win32 -ws win32 -arch x86 -product org.eclipse.epp.package.jee.product

!ENTRY org.eclipse.core.resources 2 10035 2011-03-11 11:14:42.437

!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.

!ENTRY org.eclipse.osgi 4 0 2011-03-11 11:14:42.453

!MESSAGE An error occurred while automatically activating bundle org.eclipse.core.resources (72).

!STACK 0

org.osgi.framework.BundleException: Exception in org.eclipse.core.resources.ResourcesPlugin.start() of bundle org.eclipse.core.resources.

at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:806)

at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)

at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)

at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)

at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)

at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)

at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)

at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)

at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)

at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33)

at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)

at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)

at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)

at java.lang.ClassLoader.loadClass(ClassLoader.java:248)

at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:116)

at org.eclipse.equinox.internal.app.EclipseAppHandle.run(EclipseAppHandle.java:196)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.runApplication(EclipseAppLauncher.java:110)

at org.eclipse.core.runtime.internal.adaptor.EclipseAppLauncher.start(EclipseAppLauncher.java:79)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:369)

at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:179)

at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)

at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)

at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)

at java.lang.reflect.Method.invoke(Method.java:597)

at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:619)

at org.eclipse.equinox.launcher.Main.basicRun(Main.java:574)

at org.eclipse.equinox.launcher.Main.run(Main.java:1407)

i solve the problem like this:

workspace/.metadata/.plugins/org.eclipse.core.resources/.snap

delete .snap.

then import your project again

have a good time.