java.lang.NoClassDefFoundError: javax/servlet/jsp/jstl/core/LoopTag 解决方法
原因：一般是因为项目部署位置在到Tomcat中
解决办法，把从官网下载的jstl的4个jar包放入Tomcat的lib位置
下载网址跳转门
tomcat官网，打开可能有点慢，耐心等待
然后再重启服务器基本可以恢复正常
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