使用dubbo时遇到问题：
org.xml.sax.SAXParseException: schema_reference.4: Failed to read schema document ‘http://code.alibabatech.com/schema/dubbo/dubbo.xsd‘, because 1) could not find the document; 2) the document could not be read; 3) the root element of the document is not <xsd:schema>.
解决方式：
在dubbo的开源项目上找到xsd文件：
https://github.com/alibaba/dubbo
eclispe-->window-->preferences-->xml catalog-->add 注意KEY 需要以/dubbo.xsd结尾，如下图所示
原文：https://www.cnblogs.com/zhangxj/p/9595697.html
