Investigate obscure runtime exception

java.lang.RuntimeException: java.lang.IllegalArgumentException
at com.intellij.util.io.PersistentEnumerator.valueOf(PersistentEnumerator.java:471)
at com.intellij.util.io.StringRef.getString(StringRef.java:48)
at com.intellij.util.io.StringRef.length(StringRef.java:80)
at com.intellij.psi.impl.java.stubs.impl.PsiFieldStubImpl.<init>(PsiFieldStubImpl.java:54)
at com.intellij.psi.impl.java.stubs.JavaFieldStubElementType.deserialize(JavaFieldStubElementType.java:103)
at com.intellij.psi.impl.java.stubs.JavaFieldStubElementType.deserialize(JavaFieldStubElementType.java:44)
at com.intellij.psi.stubs.SerializationManagerImpl.deserialize(SerializationManagerImpl.java:203)
at com.intellij.psi.stubs.SerializationManagerImpl.deserialize(SerializationManagerImpl.java:206)
at com.intellij.psi.stubs.SerializationManagerImpl.deserialize(SerializationManagerImpl.java:206)
at com.intellij.psi.stubs.SerializationManagerImpl.deserialize(SerializationManagerImpl.java:188)
at com.intellij.psi.stubs.SerializedStubTree.getStub(SerializedStubTree.java:34)
at com.intellij.psi.stubs.StubTree.readFromVFile(StubTree.java:138)
at com.intellij.psi.stubs.StubTree.readOrBuild(StubTree.java:102)
at com.intellij.psi.impl.source.PsiFileImpl.getStubTree(PsiFileImpl.java:588)
at com.intellij.psi.stubs.StubIndexImpl$1.perform(StubIndexImpl.java:188)
at com.intellij.psi.stubs.StubIndexImpl$1.perform(StubIndexImpl.java:176)
at com.intellij.util.indexing.ValueContainer.forEach(ValueContainer.java:56)
at com.intellij.psi.stubs.StubIndexImpl.get(StubIndexImpl.java:176)
at com.intellij.psi.stubs.AbstractStubIndex.get(AbstractStubIndex.java:34)
at com.intellij.psi.impl.java.stubs.index.JavaFullClassNameIndex.get(JavaFullClassNameIndex.java:44)
at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.a(JavaFileManagerImpl.java:312)
at com.intellij.psi.impl.file.impl.JavaFileManagerImpl.findClass(JavaFileManagerImpl.java:199)
at com.intellij.psi.impl.JavaPsiFacadeImpl$PsiElementFinderImpl.findClass(JavaPsiFacadeImpl.java:360)
at com.intellij.psi.impl.JavaPsiFacadeImpl.findClass(JavaPsiFacadeImpl.java:175)
at org.codehaus.testdox.intellij.IntelliJApi.getPsiClass(IntelliJApi.java:105)
at org.codehaus.testdox.intellij.TestLookup.getClass(TestLookup.java:30)
at org.codehaus.testdox.intellij.TestDoxFileFactory.findTestClass(TestDoxFileFactory.java:60)
at org.codehaus.testdox.intellij.TestDoxFileFactory.getTestDoxFile(TestDoxFileFactory.java:39)
at org.codehaus.testdox.intellij.TestDoxControllerImpl.selectedFileChanged(TestDoxControllerImpl.java:110)
at org.codehaus.testdox.intellij.TestDoxControllerImpl.selectionChanged(TestDoxControllerImpl.java:264)
at sun.reflect.GeneratedMethodAccessor31.invoke(Unknown Source)
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.doPumpMessages(MessageBusImpl.java:183)
at com.intellij.util.messages.impl.MessageBusImpl.doPumpMessages(MessageBusImpl.java:188)
at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:175)
at com.intellij.util.messages.impl.MessageBusImpl.pumpMessages(MessageBusImpl.java:172)
at com.intellij.util.messages.impl.MessageBusImpl.sendMessage(MessageBusImpl.java:167)
at com.intellij.util.messages.impl.MessageBusImpl.access$000(MessageBusImpl.java:40)
at com.intellij.util.messages.impl.MessageBusImpl$2.invoke(MessageBusImpl.java:106)
at $Proxy86.selectionChanged(Unknown Source)
at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.fireSelectionChanged(FileEditorManagerImpl.java:1097)
at com.intellij.openapi.fileEditor.impl.EditorsSplitters.setCurrentWindow(EditorsSplitters.java:473)
at com.intellij.openapi.fileEditor.impl.EditorWindow.setEditor(EditorWindow.java:419)
at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl.openFileImpl3(FileEditorManagerImpl.java:538)
at com.intellij.openapi.fileEditor.impl.EditorsSplitters.readExternalPanel(EditorsSplitters.java:255)
at com.intellij.openapi.fileEditor.impl.EditorsSplitters.openFiles(EditorsSplitters.java:194)
at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl$10$1$1.run(FileEditorManagerImpl.java:1009)
at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:110)
at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:86)
at com.intellij.openapi.command.impl.CommandProcessorImpl.executeCommand(CommandProcessorImpl.java:78)
at com.intellij.openapi.fileEditor.impl.FileEditorManagerImpl$10$1.run(FileEditorManagerImpl.java:1006)
at com.intellij.openapi.wm.impl.commands.InvokeLaterCmd.run(InvokeLaterCmd.java:33)
at com.intellij.openapi.application.impl.LaterInvocator$FlushQueue.run(LaterInvocator.java:319)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at com.intellij.ide.IdeEventQueue.f(IdeEventQueue.java:610)
at com.intellij.ide.IdeEventQueue.b(IdeEventQueue.java:500)
at com.intellij.ide.IdeEventQueue.dispatchEvent(IdeEventQueue.java:368)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.lang.IllegalArgumentException
at java.nio.Buffer.position(Buffer.java:218)
at com.intellij.util.io.PagedFileStorage.get(PagedFileStorage.java:171)
at com.intellij.util.io.PagedFileStorage.getInt(PagedFileStorage.java:121)
at com.intellij.util.io.ResizeableMappedFile.getInt(ResizeableMappedFile.java:141)
at com.intellij.util.io.PersistentEnumerator.valueOf(PersistentEnumerator.java:458)
... 65 more