The processing instruction target matching "[xX][mM][lL]" is not allowed.2010-04-19 19:01The processing instruction target matching "[xX][mM][lL]" is not allowed.
Exception:org.xml.sax.SAXParseException: The processing instruction target matching "[xX][mM][lL]" is not allowed.
这个异常解释为：xml文件不能被解析，一般出现这样的问题在于xml格式上，并且问题多出现在xml文件的头部。我就是出现了这个问题。昨天还可 以正常运行的，今天来了就运行不了了，很奇怪，查看了下错误信息，找到了原因。这是因为我的xml文件头部有两行空行，第三行才开始写
<!DOCTYPE struts-config PUBLIC "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN" "http://struts.apache.org/dtds/struts-config_1_2.dtd">
的。
总结：<?xml version="1.0" encoding="UTF-8"?>前面不要有任何其他字符，如空格、回车、换行这些否则就会出现上面的异常。
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