Eclipse里的No grammar constraints (DTD or XML schema) detected for the document警告
警告信息，没事的，一般IDE环境中配置档的最前面都是DTD 或 XML 打头的。比如
< ?xml version="1.0" encoding="UTF-8"?>
< !DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
dtd验证是xml的规范，要去除警告的话：工具栏：windows => preferences => xml => xml files => validation => Indicate when no grammar is specified:选择Ignore即可。