Servlet.service() for servlet jsp threw exception java.lang.NullPointerException

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本文解决了一个在使用Tomcat启动Spring MVC应用时遇到的NullPointerException问题，该问题由index.jsp页面初始化时引发。通过调整Maven依赖配置，排除了冲突的jsp-api.jar和servlet-api.jar，最终解决了异常。

严重: Servlet.service() for servlet [springmvc] in context with path [/XXX] threw exception [java.lang.NullPointerException] with root cause
java.lang.NullPointerException
   at org.apache.jsp.index_jsp._jspInit(index_jsp.java:22)
   at org.apache.jasper.runtime.HttpJspBase.init(HttpJspBase.java:47)
   at org.apache.jasper.servlet.JspServletWrapper.getServlet(JspServletWrapper.java:154)
   at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:332)
   at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:320)
   at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:265)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
   at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
   at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
   at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:674)
   at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:462)
   at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:401)
   at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:329)
   at org.springframework.web.servlet.view.InternalResourceView.renderMergedOutputModel(InternalResourceView.java:168)
   at org.springframework.web.servlet.view.AbstractView.render(AbstractView.java:303)
   at org.springframework.web.servlet.DispatcherServlet.render(DispatcherServlet.java:1246)
   at org.springframework.web.servlet.DispatcherServlet.processDispatchResult(DispatcherServlet.java:1029)
   at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:973)
   at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:895)
   at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:967)
   at org.springframework.web.servlet.FrameworkServlet.doGet(FrameworkServlet.java:858)
   at javax.servlet.http.HttpServlet.service(HttpServlet.java:621)
   at org.springframework.web.servlet.FrameworkServlet.service(FrameworkServlet.java:843)

tomcat启动，由于工程引入的jar包（jsp-api.jar，servlet-api.jar）和tomcat里的冲突所致。但jetty服务器启动正常。

解决方式： maven依赖排除这两个jar。如果是jar包引入方式，删除掉这两个。

下面是maven工程操作：

<dependency>
           <groupId>javax.servlet.jsp.jstl</groupId>
           <artifactId>jstl-api</artifactId>
           <version>1.2</version>
           <exclusions>
               <exclusion>
                   <groupId>javax.servlet</groupId>
                   <artifactId>servlet-api</artifactId>
               </exclusion>
               <exclusion>
                   <groupId>javax.servlet.jsp</groupId>
                   <artifactId>jsp-api</artifactId>
               </exclusion>
           </exclusions>
       </dependency>

至此，出现的问题解决。