Struts2 报500错误

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#Struts2 报500错误

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本文探讨了在使用Struts2框架时遇到的Servlet服务异常问题，特别是Java.lang.NullPointerException错误，并揭示了其根本原因在于jar包冲突。通过删除特定的jar文件（jsp-api.jar），成功解决了该问题，提供了详细的排查步骤与解决方案。

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控制台报的错：

SEVERE: Servlet.service() for servlet jsp threw exception

java.lang.NullPointerException
   at org.apache.jsp.userAdd_jsp._jspInit(userAdd_jsp.java:22)
   at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:52)
   at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:159)
   at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:329)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:337)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:266)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.struts2.dispatcher.ng.filter.StrutsPrepareAndExecuteFilter.doFilter(StrutsPrepareAndExecuteFilter.java:96)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
   at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
   at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
   at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
   at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
   at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
   at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:286)
   at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
   at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
   at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
   at java.lang.Thread.run(Unknown Source)

查了老半天，以为是struts2版本冲突的问题，下载了一个最新的还是不行, 后来是才发现是因为jar包冲突，太坑了

删掉jsp-api.jar 即可