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Stack trace below. See <----- NullPointerException for line. public static boolean isDTDBasedDocument(Document document) { ((AbstractDocument)document).readLock(); try { TokenHierarchy th = TokenHierarchy.get(document); TokenSequence ts = th.tokenSequence(); while(ts.moveNext()) { <----- NullPointerException here Token token = ts.token(); The solution is obvious: put in a check for "if (ts != null)" before the while loop and allow the method to return false. You can see from the source of TokenHierarchy.tokenSequence that null is a reasonable return value. ------------------------------ java.lang.NullPointerException at org.netbeans.modules.xml.schema.completion.util.CompletionUtil.isDTDBasedDocument(CompletionUtil.java:669) at org.netbeans.modules.xml.schema.completion.util.CompletionUtil.canProvideCompletion(CompletionUtil.java:769) at org.netbeans.modules.xml.schema.completion.SchemaBasedCompletionProvider.getAutoQueryTypes(SchemaBasedCompletionProvider.java:80) at org.netbeans.modules.editor.completion.CompletionImpl.insertUpdate(CompletionImpl.java:320) at org.netbeans.lib.editor.util.swing.PriorityDocumentListenerList.insertUpdate(PriorityDocumentListenerList.java:85) at javax.swing.text.AbstractDocument.fireInsertUpdate(AbstractDocument.java:185) at org.netbeans.editor.BaseDocument.fireInsertUpdate(BaseDocument.java:1670) at org.netbeans.editor.BaseDocument.insertString(BaseDocument.java:816) at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.insertString(BaseKit.java:1198) at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.performTextInsertion(BaseKit.java:1264) at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.access$100(BaseKit.java:1077) at org.netbeans.editor.BaseKit$DefaultKeyTypedAction$1.run(BaseKit.java:1137) at org.netbeans.editor.GuardedDocument.runAtomicAsUser(GuardedDocument.java:344) at org.netbeans.editor.BaseKit$DefaultKeyTypedAction.actionPerformed(BaseKit.java:1130) at org.netbeans.editor.ext.ExtKit$ExtDefaultKeyTypedAction.actionPerformed(ExtKit.java:1068) at org.netbeans.editor.BaseAction.actionPerformed(BaseAction.java:339) at javax.swing.SwingUtilities.notifyAction(SwingUtilities.java:1633) at javax.swing.JComponent.processKeyBinding(JComponent.java:2851) at javax.swing.JComponent.processKeyBindings(JComponent.java:2886) at javax.swing.JComponent.processKeyEvent(JComponent.java:2814) at java.awt.Component.processEvent(Component.java:6040) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4630) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.KeyboardFocusManager.redispatchEvent(KeyboardFocusManager.java:1850) at java.awt.DefaultKeyboardFocusManager.dispatchKeyEvent(DefaultKeyboardFocusManager.java:712) at java.awt.DefaultKeyboardFocusManager.preDispatchKeyEvent(DefaultKeyboardFocusManager.java:990) at java.awt.DefaultKeyboardFocusManager.typeAheadAssertions(DefaultKeyboardFocusManager.java:855) at java.awt.DefaultKeyboardFocusManager.dispatchEvent(DefaultKeyboardFocusManager.java:676) at java.awt.Component.dispatchEventImpl(Component.java:4502) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4460) at java.awt.EventQueue.dispatchEvent(EventQueue.java:599) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:148) [catch] 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)
I also should have noted that this occurred when making a NetBeans Platform application therefore it may not show up in NetBeans IDE.
Created attachment 109538 [details] plattform properties for my app
This happens when "Schema Aware Code Completion" in a Plattform Application is enabled.
The described bug is a bug and should be corrected, no doubt. I just want to leave a hint on the cause of the NullpointerException: The reason why tokenSequence (line 668 in CompletionUtil) returns null (and leads to the NullpointerException in 669) is, that there's no appropriate LanguageProvider registered in your case. I'd bet that you missed to add a Dependency to org.getbeans.modules : org-netbans-modules-lexer-nbbridge, which provides the org.netbeans.modules.lexer.nbbridge.MimeLookupLanguageProvider. Just found that out on a long trial-error-journey through loads of Netbeans-Modules. It seems to be awfully complicated to integrate a schema-aware XMLEditor in a standalone app.
Hi, thanks for your help. You're right about the root cause being the missing org-netbans-modules-lexer-nbbridge dependency. As far as that goes, I think a problem with the way the module system works is that some of the modules are implementation only (which in itself is fine) but that when you add a dependency to get an XML editor, etc. it picks up the API (interface) modules as being required but no implementation. You don't need any particular implementation or more than one, but you do need one for things to work. By NetBeans Platform application I didn't mean a standalone app, I meant it's not the IDE itself. It's still a regular, bona-fide NetBeans Platform application using the module system, etc.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss