cvc-complex-type.2.4.c: The matching wildcard is strict, but no declaration can be found for element 'dubbo:reference'.
具体错误如下：
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:reference'.
- 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>.
根据错误提示，有可能是http://code.alibabatech.com/schema/dubbo/dubbo.xsd这个文档找不到或者打不开，大致的思路是，到网上下载一个dubbo.xsd文件，其实在dubbo的jar包里就有，直接解压出来就好，放到本地目录，然后在Eclipse里配置上关联关系，让Eclipse能找到这个文件即可。
1、下载一个dubbo.xsd文件或者找到dubbo-2.5.3.jar包，解压，找到META_INF->dubbo.xsd
2、在windows->preferrence->xml->xmlcatalogadd->catalog entry ->file system 选择刚刚下载的文件路径；
3、修改key值和配置文件的http://code.alibabatech.com/schema/dubbo/dubbo.xsd 相同保存。
4、在xml文件右键validate就可以解决了。
