java.lang.IllegalStateException: Lexer org.netbeans.modules.el.lexer.ELLexer@33467a5e
  returned null token but lexerInput.readLength()=1
  lexer-state: org.netbeans.modules.el.lexer.ELState@35a
  tokenStartOffset=321, readOffset=322, lookaheadOffset=323
  Chars: "\\" - these characters need to be tokenized.
Fix the lexer to not return null token in this state.
   at org.netbeans.lib.lexer.LexerInputOperation.checkLexerInputFinished(LexerInputOperation.java:457)
   at org.netbeans.lib.lexer.LexerInputOperation.nextToken(LexerInputOperation.java:217)
   at org.netbeans.lib.lexer.inc.TokenListUpdater.relex(TokenListUpdater.java:627)
   at org.netbeans.lib.lexer.inc.TokenListUpdater.updateRegular(TokenListUpdater.java:280)
   at org.netbeans.lib.lexer.inc.TokenHierarchyUpdate$UpdateItem.update(TokenHierarchyUpdate.java:350)
   at org.netbeans.lib.lexer.inc.TokenHierarchyUpdate.processLevelInfos(TokenHierarchyUpdate.java:225)
   at org.netbeans.lib.lexer.inc.TokenHierarchyUpdate.updateImpl(TokenHierarchyUpdate.java:196)
   at org.netbeans.lib.lexer.inc.TokenHierarchyUpdate.update(TokenHierarchyUpdate.java:134)
   at org.netbeans.lib.lexer.TokenHierarchyOperation.textModified(TokenHierarchyOperation.java:605)
   at org.netbeans.spi.lexer.TokenHierarchyControl.textModified(TokenHierarchyControl.java:96)
   at org.netbeans.lib.lexer.inc.DocumentInput.textModified(DocumentInput.java:152)
   at org.netbeans.lib.lexer.inc.DocumentInput.insertUpdate(DocumentInput.java:141)
   at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.insertUpdate(PriorityDocumentListenerList.java:85)
   at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:201)
   at org.netbeans.editor.BaseDocument.fireInsertUpdate(BaseDocument.java:1624)
   at org.netbeans.editor.BaseDocument.handleInsertString(BaseDocument.java:829)
   at org.netbeans.editor.BaseDocument$FilterBypassImpl.insertString(BaseDocument.java:2497)
   at javax.swing.text.DocumentFilter.insertString(DocumentFilter.java:100)
   at org.openide.text.CloneableEditorSupport$DocFilter.insertString(CloneableEditorSupport.java:2347)
   at org.netbeans.editor.BaseDocument.insertString(BaseDocument.java:755)
   at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.insertString(BaseKit.java:1221)
   at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.performTextInsertion(BaseKit.java:1287)
   at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.access$100(BaseKit.java:1052)
   at org.netbeans.editor.BaseKit$DefaultKeyTypedAction$2.run(BaseKit.java:1155)
   at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:356)
   at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.actionPerformed(BaseKit.java:1131)
   at org.netbeans.editor.ext.ExtKit$ExtDefaultKeyTypedAction.actionPerformed(ExtKit.java:1024)
   at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:337)
   at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1663)
   at javax.swing.JComponent.processKeyBinding(JComponent.java:2879)
   at javax.swing.JComponent.processKeyBindings(JComponent.java:2926)
   at javax.swing.JComponent.processKeyEvent(JComponent.java:2842)
   at java.awt.Component.processEvent(Component.java:6304)
   at java.awt.Container.processEvent(Container.java:2234)
   at java.awt.Component.dispatchEventImpl(Component.java:4883)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Component.dispatchEvent(Component.java:4705)
   at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1954)
   at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:806)
   at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:1074)
   at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:945)
   at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:771)
   at java.awt.Component.dispatchEventImpl(Component.java:4754)
   at java.awt.Container.dispatchEventImpl(Container.java:2292)
   at java.awt.Window.dispatchEventImpl(Window.java:2739)
   at java.awt.Component.dispatchEvent(Component.java:4705)
   at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:746)
   at java.awt.EventQueue.access$400(EventQueue.java:97)
   at java.awt.EventQueue$3.run(EventQueue.java:697)
   at java.awt.EventQueue$3.run(EventQueue.java:691)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:86)
   at java.awt.EventQueue$4.run(EventQueue.java:719)
   at java.awt.EventQueue$4.run(EventQueue.java:717)
   at java.security.AccessController.doPrivileged(AccessController.java:0)
   at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75)
   at java.awt.EventQueue.dispatchEvent(EventQueue.java:716)
   at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159)
   at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201)
   at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116)
   at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101)
   at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)
   at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)