Observed with 7628 and 8077.
On opening simplest project (e.g. creating the single java module project without facets) NoClassDefFoundError is thrown.
JSSupportLoader is in JSHtmlBridge plugin. Required JspReferenceProvidersUtil is in JavaEE plugin. Both classes are present in installation.
There is no such error in 8075.
java.lang.NoClassDefFoundError: com/intellij/psi/impl/source/jsp/JspReferenceProvidersUtil at com.intellij.javascript.JSSupportLoader.projectOpened(JSSupportLoader.java:192) at com.intellij.openapi.project.impl.ProjectImpl.c(ProjectImpl.java:45) at com.intellij.openapi.project.impl.ProjectImpl.access$300(ProjectImpl.java:66) at com.intellij.openapi.project.impl.ProjectImpl$MyProjectManagerListener.projectOpened(ProjectImpl.java:9) at com.intellij.openapi.project.impl.ProjectManagerImpl$1.projectOpened(ProjectManagerImpl.java:3) at com.intellij.openapi.project.impl.ProjectManagerImpl.d(ProjectManagerImpl.java:74) at com.intellij.openapi.project.impl.ProjectManagerImpl.openProject(ProjectManagerImpl.java:109) at com.intellij.openapi.project.impl.ProjectManagerImpl.loadAndOpenProject(ProjectManagerImpl.java:158) at com.intellij.openapi.project.impl.ProjectManagerImpl.loadAndOpenProject(ProjectManagerImpl.java:135) at com.intellij.ide.impl.ProjectUtil.openProject(ProjectUtil.java:40) at com.intellij.ide.RecentProjectsManager$MyAppLifecycleListener.appStarting(RecentProjectsManager.java:5) 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 com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:101) at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:170) at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:162) at com.intellij.util.messages.impl.MessageBusImpl.access$000(MessageBusImpl.java:36) at com.intellij.util.messages.impl.MessageBusImpl$2.invoke(MessageBusImpl.java:102) at $Proxy36.appStarting(Unknown Source) at com.intellij.idea.IdeaApplication.b(IdeaApplication.java:52) at com.intellij.idea.IdeaApplication.access$400(IdeaApplication.java:20) at com.intellij.idea.IdeaApplication$IdeStarter$3.run(IdeaApplication.java:14) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:3) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:1) at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:183) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:215) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160) at java.awt.EventDispatchThread.run(EventDispatchThread.java:121) [ 12375] ERROR - ellij.project.impl.ProjectImpl - java.lang.NoClassDefFoundError: com/intellij/psi/impl/source/jsp/JspReferenceProvidersUtil at com.intellij.javascript.JSSupportLoader.projectOpened(JSSupportLoader.java:192) at com.intellij.openapi.project.impl.ProjectImpl.c(ProjectImpl.java:45) at com.intellij.openapi.project.impl.ProjectImpl.access$300(ProjectImpl.java:66) at com.intellij.openapi.project.impl.ProjectImpl$MyProjectManagerListener.projectOpened(ProjectImpl.java:9) at com.intellij.openapi.project.impl.ProjectManagerImpl$1.projectOpened(ProjectManagerImpl.java:3) at com.intellij.openapi.project.impl.ProjectManagerImpl.d(ProjectManagerImpl.java:74) at com.intellij.openapi.project.impl.ProjectManagerImpl.openProject(ProjectManagerImpl.java:109) at com.intellij.openapi.project.impl.ProjectManagerImpl.loadAndOpenProject(ProjectManagerImpl.java:158) at com.intellij.openapi.project.impl.ProjectManagerImpl.loadAndOpenProject(ProjectManagerImpl.java:135) at com.intellij.ide.impl.ProjectUtil.openProject(ProjectUtil.java:40) at com.intellij.ide.RecentProjectsManager$MyAppLifecycleListener.appStarting(RecentProjectsManager.java:5) 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 com.intellij.util.messages.impl.MessageBusConnectionImpl.deliverMessage(MessageBusConnectionImpl.java:101) at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:170) at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:162) at com.intellij.util.messages.impl.MessageBusImpl.access$000(MessageBusImpl.java:36) at com.intellij.util.messages.impl.MessageBusImpl$2.invoke(MessageBusImpl.java:102) at $Proxy36.appStarting(Unknown Source) at com.intellij.idea.IdeaApplication.b(IdeaApplication.java:52) at com.intellij.idea.IdeaApplication.access$400(IdeaApplication.java:20) at com.intellij.idea.IdeaApplication$IdeStarter$3.run(IdeaApplication.java:14) at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:3) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEvent(EventQueue.java:597) at com.intellij.ide.IdeEventQueue.c(IdeEventQueue.java:1) at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:183) at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:215) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:273) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160) at java.awt.EventDispatchThread.run(EventDispatchThread.java:121) [ 12375] ERROR - ellij.project.impl.ProjectImpl - IntelliJ IDEA (Diana) #8077 Build #8077 [ 12375] ERROR - ellij.project.impl.ProjectImpl - JDK: 1.6.0_02 [ 12375] ERROR - ellij.project.impl.ProjectImpl - VM: Java HotSpot(TM) Client VM [ 12375] ERROR - ellij.project.impl.ProjectImpl - Vendor: Sun Microsystems Inc. [ 12375] ERROR - ellij.project.impl.ProjectImpl - OS: Windows XP [ 12375] ERROR - ellij.project.impl.ProjectImpl - Last Action: