org.dom4j.DocumentException: null Nested exception: null

1、错误描述

org.dom4j.DocumentException: null Nested exception: null
	at org.dom4j.io.SAXReader.read(SAXReader.java:484)
	at org.dom4j.io.SAXReader.read(SAXReader.java:343)
	at com.you.dom.utils.Reader.main(Reader.java:50)
Nested exception: 
java.net.MalformedURLException
	at java.net.URL.<init>(URL.java:619)
	at java.net.URL.<init>(URL.java:482)
	at java.net.URL.<init>(URL.java:431)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:610)
	at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:189)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:812)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
	at org.dom4j.io.SAXReader.read(SAXReader.java:465)
	at org.dom4j.io.SAXReader.read(SAXReader.java:343)
	at com.you.dom.utils.Reader.main(Reader.java:50)
Caused by: java.lang.NullPointerException
	at java.net.URL.<init>(URL.java:524)
	... 12 more
Nested exception: java.net.MalformedURLException
	at java.net.URL.<init>(URL.java:619)
	at java.net.URL.<init>(URL.java:482)
	at java.net.URL.<init>(URL.java:431)
	at com.sun.org.apache.xerces.internal.impl.XMLEntityManager.setupCurrentEntity(XMLEntityManager.java:610)
	at com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:189)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:812)
	at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:777)
	at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(XMLParser.java:141)
	at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(AbstractSAXParser.java:1213)
	at com.sun.org.apache.xerces.internal.jaxp.SAXParserImpl$JAXPSAXParser.parse(SAXParserImpl.java:648)
	at org.dom4j.io.SAXReader.read(SAXReader.java:465)
	at org.dom4j.io.SAXReader.read(SAXReader.java:343)
	at com.you.dom.utils.Reader.main(Reader.java:50)
Caused by: java.lang.NullPointerException
	at java.net.URL.<init>(URL.java:524)
	... 12 more

2、错误原因

3、解决办法