# HTTP Status 500 – Internal Server Error

Type Exception Report

Message java.lang.NullPointerException

Description The server encountered an unexpected condition that prevented it from fulfilling the request.

Exception

    javax.servlet.ServletException: java.lang.NullPointerException
            org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:545)
            org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:486)
            org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
            org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
            org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
            com.lbs.leaf.sysmanage.webcontroller.OperateLogFilter.doFilter(OperateLogFilter.java:87)
            com.lbs.leaf.sysmanage.webcontroller.SafetyFilter.doFilter(SafetyFilter.java:100)
            org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
            com.lbs.leaf.persistence.HibernateFilter.doFilter(Unknown Source)
            com.lbs.leaf.webcontroller.DisableHttpCacheFilter.doFilter(Unknown Source)
            com.lbs.leaf.webcontroller.EncodingFilter.doFilter(EncodingFilter.java:69)
            org.zreport.filter.EncodingFilter.doFilter(EncodingFilter.java:33)
            com.xss.XssFilter.doFilter(XssFilter.java:18)

Root Cause

    java.lang.NullPointerException
            com.start.si.ggws.healthfile.dwellerfile.dwellerfile.rp.DwellerfileAction.enterDwellerfileList(DwellerfileAction.java:461)
            sun.reflect.GeneratedMethodAccessor2737.invoke(Unknown Source)
            sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
            java.lang.reflect.Method.invoke(Method.java:498)
            com.lbs.leaf.BizDispatchAction.dispatchMethod(Unknown Source)
            com.lbs.leaf.BizDispatchAction.execute(Unknown Source)
            org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:484)
            org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:274)
            org.apache.struts.action.ActionServlet.process(ActionServlet.java:1482)
            org.apache.struts.action.ActionServlet.doGet(ActionServlet.java:507)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:634)
            javax.servlet.http.HttpServlet.service(HttpServlet.java:741)
            com.lbs.leaf.sysmanage.webcontroller.OperateLogFilter.doFilter(OperateLogFilter.java:87)
            com.lbs.leaf.sysmanage.webcontroller.SafetyFilter.doFilter(SafetyFilter.java:100)
            org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:53)
            com.lbs.leaf.persistence.HibernateFilter.doFilter(Unknown Source)
            com.lbs.leaf.webcontroller.DisableHttpCacheFilter.doFilter(Unknown Source)
            com.lbs.leaf.webcontroller.EncodingFilter.doFilter(EncodingFilter.java:69)
            org.zreport.filter.EncodingFilter.doFilter(EncodingFilter.java:33)
            com.xss.XssFilter.doFilter(XssFilter.java:18)

Note The full stack trace of the root cause is available in the server logs.

### Apache Tomcat/9.0.11

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