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    Check if you didn't set RequestProperty Content-Type to the wrong type or if you're trying to send the wrong file to the server.

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cannot initialize module TreeWalker - Unable to instantiate DoubleCheckedLocking
java.io.IOException: Server returned HTTP response code: 503 for URL: http://www.w3.org/TR/html4/loose.dtd	at sun.net.www.protocol.http.HttpURLConnection.getInputStream(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startEntity(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.startDTDEntity(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDTDScannerImpl.setInputSource(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.dispatch(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$DTDDriver.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl$PrologDriver.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentScannerImpl.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.next(Unknown Source)	at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(Unknown Source)	at com.puppycrawl.tools.checkstyle.api.AbstractLoader.parseInputSource(AbstractLoader.java:98)	at com.puppycrawl.tools.checkstyle.ConfigurationLoader.parseInputSource(ConfigurationLoader.java:272)	at com.puppycrawl.tools.checkstyle.ConfigurationLoader.loadConfiguration(ConfigurationLoader.java:383)