Talend open studio crashes at the start by logging error in workspace/.metadata/.log file

Talend open studio crashes at the start by logging error in .metadata/.log file

Solution  which worked for me was any one of below
1) delete folder .../talendinstalldir/workspace/.JETEmitters
2) delete  .../talendinstalldir/ComponentsCache.javacache


Error message logged in my case is given below

!SESSION 2013-07-03 23:01:05.880 -----------------------------------------------
eclipse.buildId=unknown
java.version=1.7.0
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Command-line arguments:  -os win32 -ws win32 -arch x86_64

!ENTRY org.eclipse.core.resources 2 10035 2013-07-03 23:01:08.467
!MESSAGE The workspace exited with unsaved changes in the previous session; refreshing workspace to recover changes.

!ENTRY org.eclipse.osgi 4 0 2013-07-03 23:01:08.479
!MESSAGE An error occurred while automatically activating bundle org.eclipse.core.resources (297).
!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:356)
    at org.eclipse.emf.ecore.plugin.EcorePlugin$Implementation.start(EcorePlugin.java:520)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    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:356)
    at java.lang.Class.getDeclaredConstructors0(Native Method)
    at java.lang.Class.privateGetDeclaredConstructors(Class.java:2404)
    at java.lang.Class.getConstructor0(Class.java:2714)
    at java.lang.Class.newInstance0(Class.java:343)
    at java.lang.Class.newInstance(Class.java:325)
    at org.eclipse.core.internal.registry.osgi.RegistryStrategyOSGI.createExecutableExtension(RegistryStrategyOSGI.java:184)
    at org.eclipse.core.internal.registry.ExtensionRegistry.createExecutableExtension(ExtensionRegistry.java:904)
    at org.eclipse.core.internal.registry.ConfigurationElement.createExecutableExtension(ConfigurationElement.java:243)
    at org.eclipse.core.internal.registry.ConfigurationElementHandle.createExecutableExtension(ConfigurationElementHandle.java:55)
    at org.talend.core.GlobalServiceRegister.findService(GlobalServiceRegister.java:172)
    at org.talend.core.GlobalServiceRegister.getService(GlobalServiceRegister.java:145)
    at org.talend.rcp.intro.Application.start(Application.java:84)
    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:57)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:601)
    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)
Caused by: org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element '/DEAFULTTALENDJAVADEMO/talend.project' not found.
    at org.eclipse.core.internal.dtree.AbstractDataTree.handleNotFound(AbstractDataTree.java:257)
    at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:585)
    at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:50)
    at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:59)
    at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:47)
    at org.eclipse.core.internal.dtree.DeltaDataTree.asBackwardDelta(DeltaDataTree.java:88)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:816)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:792)
    at org.eclipse.core.internal.watson.ElementTree.immutable(ElementTree.java:517)
    at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:688)
    at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1503)
    at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2134)
    at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:1883)
    at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:406)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    ... 58 more
Root exception:
org.eclipse.core.internal.dtree.ObjectNotFoundException: Tree element '/DEAFULTTALENDJAVADEMO/talend.project' not found.
    at org.eclipse.core.internal.dtree.AbstractDataTree.handleNotFound(AbstractDataTree.java:257)
    at org.eclipse.core.internal.dtree.DeltaDataTree.getData(DeltaDataTree.java:585)
    at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:50)
    at org.eclipse.core.internal.dtree.NoDataDeltaNode.asBackwardDelta(NoDataDeltaNode.java:59)
    at org.eclipse.core.internal.dtree.DataDeltaNode.asBackwardDelta(DataDeltaNode.java:47)
    at org.eclipse.core.internal.dtree.DeltaDataTree.asBackwardDelta(DeltaDataTree.java:88)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:816)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:815)
    at org.eclipse.core.internal.dtree.DeltaDataTree.reroot(DeltaDataTree.java:792)
    at org.eclipse.core.internal.watson.ElementTree.immutable(ElementTree.java:517)
    at org.eclipse.core.internal.resources.SaveManager.restore(SaveManager.java:688)
    at org.eclipse.core.internal.resources.SaveManager.startup(SaveManager.java:1503)
    at org.eclipse.core.internal.resources.Workspace.startup(Workspace.java:2134)
    at org.eclipse.core.internal.resources.Workspace.open(Workspace.java:1883)
    at org.eclipse.core.resources.ResourcesPlugin.start(ResourcesPlugin.java:406)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
    at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
    at org.eclipse.osgi.framework.internal.core.AbstractBundle.start(AbstractBundle.java:284)
    at org.eclipse.osgi.framework.util.SecureAction.start(SecureAction.java:417)
    at org.eclipse.osgi.internal.loader.BundleLoader.setLazyTrigger(BundleLoader.java:265)
    at org.eclipse.core.runtime.internal.adaptor.EclipseLazyStarter.postFindLocalClass(EclipseLazyStarter.java:106)
    at org.eclipse.osgi.baseadaptor.loader.ClasspathManager.findLocalClass(ClasspathManager.java:453)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.findLocalClass(DefaultClassLoader.java:216)
    at org.eclipse.osgi.internal.loader.BundleLoader.findLocalClass(BundleLoader.java:393)
    at org.eclipse.osgi.internal.loader.SingleSourcePackage.loadClass(SingleSourcePackage.java:33)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:466)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:422)
    at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:410)
    at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
    at org.eclipse.emf.ecore.plugin.EcorePlugin$Implementation.start(EcorePlugin.java:520)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
    at java.security.AccessController.doPrivileged(Native Method)
    at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
    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:356)
    at java.lang.Class.getDeclaredConstructors0(Native Method)