servlet service() for servlet jsp throws null pointer exception
这么一件小事折腾了一个多小时，google也上不去，对百度我就不吐槽什么了，最后用bing查出了满意的结果。一般程序中不要显式把jsp.jar和servlet.jar放在Lib目录下，因为tomcat目录下自带，如果添加进去反而会冲突。但是eclipse中不把两个包放进去又编译不通过，这只要用eclipse导入这两个包就可以了。
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