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:1411)
        at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDecls(XMLDTDScannerImpl.java:1997)
        at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.scanDTDExternalSubset(XMLDTDScannerImpl.java:320)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(XMLDocumentScannerImpl.java:1202)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(XMLDocumentScannerImpl.java:1090)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(XMLDocumentScannerImpl.java:1003)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(XMLDocumentScannerImpl.java:648)
        at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(XMLNSDocumentScannerImpl.java:140)
        at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(XMLDocumentFragmentScannerImpl.java:510)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:807)
        at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:737)
        at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:107)
        at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1205)
        at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:522)
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:106)
        at org.netbeans.modules.maven.format.checkstyle.AuxPropsImpl.convert(AuxPropsImpl.java:186)
        at org.netbeans.modules.maven.format.checkstyle.AuxPropsImpl.getCache(AuxPropsImpl.java:264)
        at org.netbeans.modules.maven.format.checkstyle.AuxPropsImpl.get(AuxPropsImpl.java:278)
        at org.netbeans.modules.maven.MavenProjectPropsImpl$MergedAuxProperties.get(MavenProjectPropsImpl.java:275)
        at org.netbeans.modules.maven.j2ee.POHImpl.obtainServerIds(POHImpl.java:249)
        at org.netbeans.modules.maven.j2ee.POHImpl.refreshAppServerAssignment(POHImpl.java:168)
        at org.netbeans.modules.maven.j2ee.POHImpl.projectOpened(POHImpl.java:115)
        at org.netbeans.spi.project.ui.ProjectOpenedHook$1.projectOpened(ProjectOpenedHook.java:81)
        at org.netbeans.modules.project.ui.OpenProjectList.notifyOpened(OpenProjectList.java:1065)
        at org.netbeans.modules.project.ui.OpenProjectList.access$800(OpenProjectList.java:122)
        at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.loadOnBackground(OpenProjectList.java:407)
        at org.netbeans.modules.project.ui.OpenProjectList$LoadOpenProjects.run(OpenProjectList.java:309)
        at org.openide.util.RequestProcessor$Task.run(RequestProcessor.java:602)
        at org.openide.util.RequestProcessor$Processor.run(RequestProcessor.java:1084)