can not find the tag library descriptor for http //java.sun.com/jsp
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配置环境的时候总有些但藤的时候，比如今天。
今天在安装jstl的时候，最新的jar包下载下来，放入WEB-INF下的lib文件夹，jsp文件中写的标签仍然报错，内容如标题所述。试了各种方法无效。中午吃晚完饭回来后重启eclipse，他竟然好了！
又新建了一个项目试了下，最后得出的结论是：建好项目后需要先把相关的加jar包放入lib，然后重启eclipse（或者等它反应一会？？），lib下的jar包才会被识别，，，，
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- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core” 解决方法
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- can not find the tag library descriptor for http //java.sun.com/jsp
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for “http://java.sun.com/jsp/jstl/core
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://Java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
- Can not find the tag library descriptor for "http://java.sun.com/jsp/jstl/core"
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- can not find the tag library descriptor for http //java.sun.com/jsp
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