SAXParseException: cvc-complex-type.3.2.2&&Document root element "beans", must match DOCTYPE root "null"

org.springframework.beans.factory.BeanDefinitionStoreException: IOException parsing XML document from class path resource [beans.xml]; nested exception is java.io.FileNotFoundException: class path resource [beans.xml] cannot be opened because it does not exist
java.io.FileNotFoundException: class path resource [beans.xml] cannot be opened because it does not exist
at org.springframework.core.io.ClassPathResource.getInputStream(ClassPathResource.java:137)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:167)
at org.springframework.beans.factory.xml.XmlBeanDefinitionReader.loadBeanDefinitions(XmlBeanDefinitionReader.java:148)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:128)
at org.springframework.beans.factory.support.AbstractBeanDefinitionReader.loadBeanDefinitions(AbstractBeanDefinitionReader.java:144)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:113)
at org.springframework.context.support.AbstractXmlApplicationContext.loadBeanDefinitions(AbstractXmlApplicationContext.java:81)
at org.springframework.context.support.AbstractRefreshableApplicationContext.refreshBeanFactory(AbstractRefreshableApplicationContext.java:89)
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:262)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:87)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:72)
at org.springframework.context.support.ClassPathXmlApplicationContext.<init>(ClassPathXmlApplicationContext.java:63)
at inspur.democreen.service.UserServiceTest.testAdd(UserServiceTest.java:21)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.junit.runners.model.FrameworkMethod$1.runReflectiveCall(FrameworkMethod.java:44)
at org.junit.internal.runners.model.ReflectiveCallable.run(ReflectiveCallable.java:15)
at org.junit.runners.model.FrameworkMethod.invokeExplosively(FrameworkMethod.java:41)
at org.junit.internal.runners.statements.InvokeMethod.evaluate(InvokeMethod.java:20)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:76)
at org.junit.runners.BlockJUnit4ClassRunner.runChild(BlockJUnit4ClassRunner.java:50)
at org.junit.runners.ParentRunner$3.run(ParentRunner.java:193)
at org.junit.runners.ParentRunner$1.schedule(ParentRunner.java:52)
at org.junit.runners.ParentRunner.runChildren(ParentRunner.java:191)
at org.junit.runners.ParentRunner.access$000(ParentRunner.java:42)
at org.junit.runners.ParentRunner$2.evaluate(ParentRunner.java:184)
at org.junit.runners.ParentRunner.run(ParentRunner.java:236)
at org.eclipse.jdt.internal.junit4.runner.JUnit4TestReference.run(JUnit4TestReference.java:49)
at org.eclipse.jdt.internal.junit.runner.TestExecution.run(TestExecution.java:38)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:467)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.runTests(RemoteTestRunner.java:683)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.run(RemoteTestRunner.java:390)
at org.eclipse.jdt.internal.junit.runner.RemoteTestRunner.main(RemoteTestRunner.java:197)







一个是解析问题，一个是beans.xml版本问题。



BeanFactory applicationContext = new ClassPathXmlApplicationContext("beans.xml");



问题提示在这一行，仔细一看，没有问题啊，



查看帮助文档

BeanFactory 还是 ApplicationContext?




简单的说：除非你有更好的理由，否则尽量使用ApplicationContext，下面是对于哪些"为什么"等等更深入的建议

ApplicationContext包含BeanFactory的所有功能。通常建议比BeanFactory优先，除非有一些限制的场合如字节长度对内存有很大的影响时（Applet）。然后，绝大多数"典型的"企业应用和系统，ApplicationContext就是你需要使用的。Spring2.0及以上版本，大量使用了link linkend="beans-factory-extension-bpp">BeanPostProcessor扩展（以便应用代理等功能），如果你选择BeanFactory则无法使用相当多的支持功能，如事务和AOP，这可能会导致混乱，因为配置并没有错误。



所以这个语法上没有错误，问题在beans.xml中

<?xml version="1.0" encoding="UTF-8"?>
<beans> 
	
	<bean name="u" class="inspur.democreen.dao.impl.UserDAOImpl">
      </bean>

   <bean id="userService" class="inspur.democreen.service.UserService" singleton = "true" >
        	<property name = "userDAO" ref="u"/>
        </bean>
	
	
</beans>

到这了，问题已经出来了，原来spring容器的xml配置文件，版本不一致，spring1X和spring2X写法是有区别的，以及使用的jar是否是spring2X，如果你改成下面的模板还是出现这个错误提示，那么你看看你的jar，是否是spring1X...

这个地方给出spring2X模板

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd"> 
	
<bean name="u" class="inspur.democreen.dao.impl.UserDAOImpl">
</bean>
<bean id="userService" class="inspur.democreen.service.UserService" >
       	<property name = "userDAO" ref="u"/>
</bean>
	
	
</beans>

OK，问题解决了，继续学习Spring的IOC，AOP...