明明已經導入了spring-web包，卻依然報這個錯誤。
首先檢查out/artifacts/XXXX/WEB-INF/lib目錄下有無spring-web的jar，如果沒有的話，Ctrl+Alt+Shift+S進入Project Structure。然后Artifacts
把依賴拖到左邊lib目錄
java.lang.NoClassDefFoundError: org/springframework/web/context/support/WebA
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Caused by: java.lang.NoClassDefFoundError: org/springframework/web/context/support/ServletRequestHan
java.lang.NoClassDefFoundError: org/springframework/dao/support/DaoSupport ...
java.lang.NoClassDefFoundError: org/springframework/boot/context/embedded/FilterRegistrationBean
java.lang.NoClassDefFoundError: org/springframework/dao/support/DaoSupport
java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext
java.lang.NoClassDefFoundError: org/springframework/context/ApplicationContext
Caused by: java.lang.NoClassDefFoundError: org/springframework/boot/context/
異常：Caused by: java.lang.NoClassDefFoundError: org/springframework/web/context/WebApplicationContext
IDEA中出現異常: java.lang.NoClassDefFoundError: org/springframework/web/context/WebApplicationContext....
缺jar包異常：java.lang.NoClassDefFoundError: org/springframework/core/convert/support/PropertyTypeDescriptor