Unable to locate Spring NamespaceHandler for XMLschemanamespace http://dubbo.apache.org/schema/dubbo

Spring通过XML整合dubbo的过程控制台包如下错误：

    Configuration problem: Unable to locate Spring NamespaceHandler for XML schema namespace [http://dubbo.apache.org/schema/dubbo]

配置如下：

<?xml version="1.0" encoding="UTF-8"?> 
<beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:dubbo="http://dubbo.apache.org/schema/dubbo" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-4.3.xsd http://dubbo.apache.org/schema/dubbo http://dubbo.apache.org/schema/dubbo/dubbo.xsd"> 
<dubbo:application name="hello-world-app" /> 
<dubbo:registry address="multicast://224.5.6.7:1234" />
 <dubbo:protocol name="dubbo" port="20880" /> 
<dubbo:service interface="com.alibaba.dubbo.demo.DemoService" ref="demoServiceLocal" /> <dubbo:reference id="demoServiceRemote" interface="com.alibaba.dubbo.demo.DemoService" /> </beans>

最后发现从http://dubbo.apache.org/zh-cn/docs/user/configuration/xml.html网站复制的有问题

 将 http://dubbo.apache.org/schema/dubbo/dubbo.xsd

上面配置为这个一直报错，改为以下

http://code.alibabatech.com/schema/dubbo/dubbo.xsd   

正确配置：

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

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