遇到这类错误，一般都是编码问题导致，文件编码、保存时的编码都要保持一致，如果尝试了好多次并且确定所有编码均为UTF-8还报下面的错误，
建议将xml文件顶部的encoding="UTF-8" 改为 encoding="GBK"
详细错误：
严重: Servlet.service() for servlet ReportServlet threw
exception
com.sun.org.apache.xerces.internal.impl.io.MalformedByteSequenceException:
Invalid byte 3 of 3-byte UTF-8 sequence.
at
com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.invalidByte(UTF8Reader.java:674)
at
com.sun.org.apache.xerces.internal.impl.io.UTF8Reader.read(UTF8Reader.java:425)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.load(XMLEntityScanner.java:1742)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.arrangeCapacity(XMLEntityScanner.java:1619)
at
com.sun.org.apache.xerces.internal.impl.XMLEntityScanner.skipString(XMLEntityScanner.java:1657)
at
com.sun.org.apache.xerces.internal.impl.XMLVersionDetector.determineDocVersion(XMLVersionDetector.java:193)
at
com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(XML11Configuration.java:771)
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.DOMParser.parse(DOMParser.java:225)
at
com.sun.org.apache.xerces.internal.jaxp.DocumentBuilderImpl.parse(DocumentBuilderImpl.java:283)
大概就这样。
这样的问题一般都是编码不一致所致。
Invalid byte 3 of 3-byte UTF-8 sequence,布布扣,bubuko.com
Invalid byte 3 of 3-byte UTF-8 sequence
原文：http://www.cnblogs.com/ssh2/p/3745848.html