The 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。
如果上面的问题都不能解决问题,还是有问题,就先将web.xml中的内容清空,重新拷贝个头
<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.5"
xmlns="http://java.sun.com/xml/ns/javaee"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://java.sun.com/xml/ns/javaee
http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd">
</web-app>
然后将内容考回来,这下上面的问题就没有了,据分析可能是eclipse缓存没有及时刷新导致的。
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