cvc-complex-type.2.4.a: Invalid content was found starting with element 'async-supported'.

cvc-complex-type.2.4.a: Invalid content was found starting with element 'async-supported'. One of 

 '{"http://java.sun.com/xml/ns/javaee":init-param}' is expected.

web.xml总是报cvc-complex-type.2.4.a: Invalid content was found starting with element 'async-supported'. 错误，还出现小红叉，在网上找了很多，有说是把报红叉的代码写在之间，试了之后发现完全没用。 后来在外文网站上找到了一个方法就把问题解决了。所以记录下来，以后再次遇到了就方便解决了。

 解决办法为：将“http://www.springmodules.org/schema/cache/springmodules-cache.xsd http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd” 这段话加入到xml文件"xmlns:xsi="的标签中，问题就解决了。