Spring 在+publicId+和+systemId+之間需要有空格

今天配置Spring，遇到一個很奇葩的問題：

Spring.xml的配置檔案内容：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
      http://www.springframework.org/schema/context      
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd      
      http://www.springframework.org/schema/context/spring-context.xsd
      ">      

測試出錯：

Tests in error: 
  instanceSpring(com.qunar.studyspring.SpringTest): Line 1 in XML document from class path resource [spring.xml] is invalid; nested exception is org.xml.sax.SAXParseException; systemId: http://www.springframework.org/schema/tx/; lineNumber: 1; columnNumber: 55; 在 publicId 和 systemId 之間需要有空格。      

百思不得其解，後來在網絡上搜尋了半天，結論就是：前一個是publicID，後一個是SystemId，是一一對應的，位置不能颠倒

http://www.springframework.org/schema/beans publicID
http://www.springframework.org/schema/beans/spring-beans-2.5.xsd SystemId      

修改之後：

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
    xmlns:context="http://www.springframework.org/schema/context" 
    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xmlns:tx="http://www.springframework.org/schema/tx"
    xsi:schemaLocation="http://www.springframework.org/schema/beans
      http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
      http://www.springframework.org/schema/context      
      http://www.springframework.org/schema/context/spring-context.xsd
      http://www.springframework.org/schema/tx
      http://www.springframework.org/schema/tx/spring-tx-3.0.xsd      
      ">      

黑色部分就是給我留下深刻記憶的部分，次序颠倒了