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：
eclispe-->window-->preferences-->xml catalog-->add 注意KEY 需要以/dubbo.xsd结尾，如下图所示
然后需要对xml文件进行Validate，就可以了