本文介绍了一个关于Spring框架中XML配置文件缺少DTD声明的问题，导致BeanDefinitionStoreException异常。通过添加正确的DTD声明解决了该问题。
问题:
Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Line 2 in XML document from file [D:/Eclipse Workspace/MyEclipse 5.1/workspace/spring1/bean.xml] is invalid; nested exception is org.xml.sax.SAXParseException: Document root element "beans", must match DOCTYPE root "null".
org.xml.sax.SAXParseException: Document root element "beans", must match DOCTYPE root "null".
解决方法:
加一行:<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" " http://www.springframework.org/dtd/spring-beans.dtd">
原因:没有申明类型即DTD文档类型定义
Exception in thread "main" org.springframework.beans.factory.BeanDefinitionStoreException: Line 2 in XML document from file [D:/Eclipse Workspace/MyEclipse 5.1/workspace/spring1/bean.xml] is invalid; nested exception is org.xml.sax.SAXParseException: Document root element "beans", must match DOCTYPE root "null".
org.xml.sax.SAXParseException: Document root element "beans", must match DOCTYPE root "null".
解决方法:
加一行:<!DOCTYPE beans PUBLIC "-//SPRING//DTD BEAN//EN" " http://www.springframework.org/dtd/spring-beans.dtd">
原因:没有申明类型即DTD文档类型定义
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