Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
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project在Tomcat中运行，报错：Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
指向struts filter的自定义类。
是项目引用的jar包问题，\WEB-INF\lib下的两个包：jsp-api.jar和servlet-api.jar发生版本冲突，删除这两个包即可
引用：http://blog.sina.com.cn/s/blog_80af3a730100ss64.html
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- Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
- Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
- Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
- 严重: Servlet.service() for servlet jsp threw exception java.lang.NullPointerException at org.apache.
- 严重: Servlet.service() for servlet jsp threw exception java.lang.NullPointerException
- Servlet.service() for servlet jsp threw exception
- Servlet.service() for servlet jsp threw exception
- Servlet.service() for servlet jsp threw exception
- Servlet.service() for servlet jsp threw exception
- Servlet.service() for servlet jsp threw exception
- Servlet.service() for servlet jsp threw exception
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- 严重: Servlet.service() for servlet jsp threw exception
- 严重: Servlet.service() for servlet jsp threw exception
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