错误如下：
Multiple annotations found at this line:
- cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'dubbo:application'.
- 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>.
问题原因：没有导入 dubbo的 xsd文件
解决方案：
解决方案：
下载一个dubbo.xsd文件
windows->preferrence->xml->xml catalog
add->catalog entry ->file system 选择刚刚下载的文件路径
修改key值和配置文件的http://code.alibabatech.com/schema/dubbo/dubbo.xsd 相同
在xml文件右键validate