Solve the problem of <async-supported>true</async-supported> error in web.xml

http://www.springmodules.org/schema/cache/springmodules-cache.xsd

http://www.springmodules.org/schema/cache/springmodules-ehcache.xsd

Add the appeal code to <web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" as shown in the figure

 

Second, or change the version to 3.0

version="2.5"

Change to version="3.0"