java.lang.NullPointerException
        at com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.skipChar(XMLEntityScanner.java:1414)
        at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.skipSeparator(XMLDTDScannerImpl.java:2056)
        at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDecls(XMLDTDScannerImpl.java:1959)
        at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDTDExternalSubset(XMLDTDScannerImpl.java:320)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1185)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1075)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:993)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:647)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:508)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
        at org.netbeans.core.filesystems.DefaultParser.parse(DefaultParser.java:136)
        at org.netbeans.core.filesystems.XMLMIMEComponent$SniffingParser.sniff(XMLMIMEComponent.java:261)
        at org.netbeans.core.filesystems.XMLMIMEComponent.acceptFileObject(XMLMIMEComponent.java:80)
        at org.netbeans.core.filesystems.MIMEResolverImpl$FileElement.resolve(MIMEResolverImpl.java:428)
        at org.netbeans.core.filesystems.MIMEResolverImpl$FileElement.access$100(MIMEResolverImpl.java:410)
        at org.netbeans.core.filesystems.MIMEResolverImpl$Impl.findMIMEType(MIMEResolverImpl.java:139)
        at org.openide.filesystems.MIMESupport$CachedFileObject.resolveMIME(MIMESupport.java:253)
        at org.openide.filesystems.MIMESupport$CachedFileObject.getMIMEType(MIMESupport.java:241)
        at org.openide.filesystems.MIMESupport.findMIMEType(MIMESupport.java:115)
        at org.openide.filesystems.FileUtil.getMIMETypeOrDefault(FileUtil.java:1125)
        at org.openide.filesystems.FileObject.getMIMEType(FileObject.java:489)
        at org.netbeans.modules.web.debug.util.Utils.isJsp(Utils.java:100)
        at org.netbeans.modules.web.debug.actions.JspToggleBreakpointActionProvider.propertyChange(JspToggleBreakpointActionProvider.java:96)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:339)
        at java.beans.PropertyChangeSupport.firePropertyChange(PropertyChangeSupport.java:276)
        at org.netbeans.modules.debugger.jpda.projects.EditorContextImpl$EditorLookupListener.run(EditorContextImpl.java:1957)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:561)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:986)