org.xml.sax.SAXParseException: The markup declarations contained or pointed to by the document type declaration must be well-formed.
   at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(ErrorHandlerWrapper.java:195)
   at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.fatalError(ErrorHandlerWrapper.java:174)
   at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(XMLErrorReporter.java:388)
   at com.sun.org.apache.xerces.internal.impl.XMLScanner.reportFatalError(XMLScanner.java:1414)
   at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDecls(XMLDTDScannerImpl.java:1998)
   at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDTDExternalSubset(XMLDTDScannerImpl.java:320)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1203)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1090)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1003)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
   at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
   at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:511)
   at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:808)
   at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
   at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:119)
   at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
   at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
Caused: org.jdom.input.JDOMParseException: Error on line 1 of document http://www.puppycrawl.com/dtds/configuration_1_2.dtd: The markup declarations contained or pointed to by the document type declaration must be well-formed.
   at org.jdom.input.SAXBuilder.build(SAXBuilder.java:465)
   at org.jdom.input.SAXBuilder.build(SAXBuilder.java:770)
   at org.netbeans.modules.maven.format.checkstyle.ModuleConvertor.convert(ModuleConvertor.java:125)
   at org.netbeans.modules.maven.format.checkstyle.AuxPropsImpl.convert(AuxPropsImpl.java:208)
   at org.netbeans.modules.maven.format.checkstyle.AuxPropsImpl.getCache(AuxPropsImpl.java:287)
   at org.netbeans.modules.maven.format.checkstyle.AuxPropsImpl.get(AuxPropsImpl.java:302)
   at org.netbeans.modules.maven.MavenProjectPropsImpl$MergedAuxProperties.get(MavenProjectPropsImpl.java:275)
   at org.netbeans.modules.maven.api.execute.RunUtils.hasTestCompileOnSaveEnabled(RunUtils.java:153)
   at org.netbeans.modules.maven.cos.CopyResourcesOnSave.getOwningMavenProject(CopyResourcesOnSave.java:145)
   at org.netbeans.modules.maven.cos.CopyResourcesOnSave.fileChanged(CopyResourcesOnSave.java:165)
   at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEventImpl(FCLSupport.java:142)
   at org.openide.filesystems.FCLSupport$DispatchEventWrapper.dispatchEvent(FCLSupport.java:125)
   at org.openide.filesystems.FCLSupport.dispatchEvent(FCLSupport.java:102)
   at org.openide.filesystems.FileObject$ED.dispatch(FileObject.java:1111)
   at org.openide.filesystems.FileSystem$EventDispatcher.run(FileSystem.java:912)
   at org.openide.filesystems.EventControl.dispatchEvent(EventControl.java:79)
   at org.openide.filesystems.FileSystem.dispatchEvent(FileSystem.java:574)
   at org.openide.filesystems.FileObject.dispatchEvent(FileObject.java:531)
   at org.openide.filesystems.FileObject.fireFileChangedEvent(FileObject.java:499)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.fireFileChangedEvent(BaseFileObj.java:541)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.refreshImpl(FileObj.java:288)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.BaseFileObj.refresh(BaseFileObj.java:677)
   at org.netbeans.modules.masterfs.filebasedfs.fileobjects.FileObj.refresh(FileObj.java:299)
   at org.openide.filesystems.FileObject.refresh(FileObject.java:987)
   at org.netbeans.modules.editor.NbEditorUI$1$1.run(NbEditorUI.java:131)
   at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:1415)
   at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1954)