spring的module-context.xml文件报找不到dubbo.xsd文件错误

问题：

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>.

思路：1、直接访问报错信息中的“http://code.alibabatech.com/schema/dubbo/dubbo.xsd”链接，发现无法访问；

   2、手动添加dubbo.xsd文件，参考https://www.cnblogs.com/panxuejun/p/6102011.html，添加后仍报错；

   3、update project后终于不报错了。

感谢：https://www.cnblogs.com/panxuejun/p/6102011.html 的作者。

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