Failed to load or instantiate TagLibraryValidator class: org.apache.taglibs.

解决办法：

1.根本原因在编译的时候没有加入server runtime变量而是直接把servlet-api.jar jsp-api.jar 放到
WEB-INF/lib下
解决方法：删除WEB-INF/lib下面的servlet-api.jar jsp-api.jar

lib里面没有则删除tomcat里面的对应jar包

2.如果第一种不行，确保这几个包都有

standard-1.1.2.jar
servlet-api-2.4.jar
jstl-1.1.2.jar

3.如果第二种也不行，那只有更换jdk版本

就是将jdk版本换成5.0的,jre5.0就可以了，百发百中

转载于:https://www.cnblogs.com/wxm-bk/p/6494552.html

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