现象：

访问tomcat项目报错，查看tomcat日志有报错

Sep 12, 2024 5:15:59 PM org.apache.catalina.core.StandardWrapperValve invoke
SEVERE: Servlet.service() for servlet [jsp] in context with path [] threw exception
java.lang.NullPointerException
        at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:371)
        at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:334)
        at javax.servlet.http.HttpServlet.service(HttpServlet.java:722)
        at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:304)
        at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:210)
        at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:684)

原因：

项目依赖的jar包和tomcat容器的依赖jar包有重复，一般为servlet-api.jar、jsp-api.jar

解决方式：

如果是非maven项目，在/WEB-INF/lib中找出servlet-api.jar、jsp-api.jar删除
如果是maven项目就把pom.xml中的servlet依赖注释掉

注释掉重新打包发布