I installed an epp build from hudson [1] which started ok. Then I installed the 0.14 e4tools and css-spy from [2] after that eclipse will not start:
!SESSION 2013-03-18 12:21:01.286 -----------------------------------------------
eclipse.buildId=4.3.0.I20130314-1330
java.version=1.8.0-ea
java.vendor=Oracle Corporation
BootLoader constants: OS=win32, ARCH=x86_64, WS=win32, NL=en_US
Framework arguments: -product org.eclipse.epp.package.rcp.product
Command-line arguments: -os win32 -ws win32 -arch x86_64 -product org.eclipse.epp.package.rcp.product -clean
!ENTRY org.eclipse.osgi 4 0 2013-03-18 12:21:13.339
!MESSAGE Application error
!STACK 1
java.lang.NoClassDefFoundError: Lorg/eclipse/e4/ui/model/application/MApplication;
at java.lang.Class.getDeclaredFields0(Native Method)
at java.lang.Class.privateGetDeclaredFields(Class.java:2356)
at java.lang.Class.getDeclaredFields(Class.java:1762)
at org.eclipse.e4.core.internal.di.InjectorImpl.processFields(InjectorImpl.java:611)
at org.eclipse.e4.core.internal.di.InjectorImpl.processClass(InjectorImpl.java:577)
at org.eclipse.e4.core.internal.di.InjectorImpl.processClassHierarchy(InjectorImpl.java:558)
at org.eclipse.e4.core.internal.di.InjectorImpl.inject(InjectorImpl.java:89)
at org.eclipse.e4.core.internal.di.InjectorImpl.internalMake(InjectorImpl.java:321)
at org.eclipse.e4.core.internal.di.InjectorImpl.make(InjectorImpl.java:255)
at org.eclipse.e4.core.contexts.ContextInjectionFactory.make(ContextInjectionFactory.java:186)
at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.createFromBundle(ReflectionContributionFactory.java:105)
at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.doCreate(ReflectionContributionFactory.java:71)
at org.eclipse.e4.ui.internal.workbench.ReflectionContributionFactory.create(ReflectionContributionFactory.java:49)
at org.eclipse.e4.ui.internal.workbench.ModelAssembler.runProcessor(ModelAssembler.java:224)
at org.eclipse.e4.ui.internal.workbench.ModelAssembler.processModel(ModelAssembler.java:191)
at org.eclipse.e4.ui.internal.workbench.ResourceHandler.loadMostRecentModel(ResourceHandler.java:213)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.loadApplicationModel(E4Application.java:389)
at org.eclipse.e4.ui.internal.workbench.swt.E4Application.createE4Workbench(E4Application.java:238)
at org.eclipse.ui.internal.Workbench$5.run(Workbench.java:569)
at org.eclipse.core.databinding.observable.Realm.runWithDefault(Realm.java:332)
at org.eclipse.ui.internal.Workbench.createAndRunWorkbench(Workbench.java:555)
at org.eclipse.ui.PlatformUI.createAndRunWorkbench(PlatformUI.java:149)
at org.eclipse.ui.internal.ide.application.IDEApplication.start(IDEApplication.java:124)
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:354)
at org.eclipse.core.runtime.adaptor.EclipseStarter.run(EclipseStarter.java:181)
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:487)
at org.eclipse.equinox.launcher.Main.invokeFramework(Main.java:636)
at org.eclipse.equinox.launcher.Main.basicRun(Main.java:591)
at org.eclipse.equinox.launcher.Main.run(Main.java:1450)
at org.eclipse.equinox.launcher.Main.main(Main.java:1426)
Caused by: java.lang.ClassNotFoundException: org.eclipse.e4.ui.model.application.MApplication cannot be found by org.eclipse.e4.tools.css.spy_0.12.0.v20121212-1112
at org.eclipse.osgi.internal.loader.BundleLoader.findClassInternal(BundleLoader.java:501)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:421)
at org.eclipse.osgi.internal.loader.BundleLoader.findClass(BundleLoader.java:412)
at org.eclipse.osgi.internal.baseadaptor.DefaultClassLoader.loadClass(DefaultClassLoader.java:107)
at java.lang.ClassLoader.loadClass(ClassLoader.java:356)
... 36 more