最近都在研究shiro这个框架，今天实施了一下，就报了如下错误：
cvc-complex-type.2.4.a: Invalid content was found starting with element 'async-supported'. One of '{"https://java.sun.com/xml/ns/
javaee":init-param}' is expected.cvc-co
阅读背景：
shiro中async-supported报错 cvc-complex-type.2.4.a: Invalid content was found starting with element 'async-supported'. One of '{"https://java.sun.com/xml/ns/ javaee":init-param}' is expected.
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