这是怎么回事啊!!!

Question

type Exception report message  description The server encountered an internal error () that prevented it from fulfilling this request. exception  javax.servlet.ServletException 
org.apache.struts.action.RequestProcessor.processException(RequestProcessor.java:523) 
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:421) 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224) 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) 
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) 
cn.sh.ideal.service.servlet.APPActionServlet.doPost(APPActionServlet.java:28) 
cn.sh.ideal.service.servlet.APPActionServlet.doGet(APPActionServlet.java:22) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:690) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
cn.sh.ideal.service.servlet.UserFilter.doFilter(UserFilter.java:58) 
root cause  java.lang.NullPointerException 
cn.sh.ideal.web.system.actions.articletype.ArticleTypeInitAction.forwardHandle(ArticleTypeInitAction.java:67) 
cn.sh.ideal.web.comm.action.ForwardAction.handle(ForwardAction.java:55) 
cn.sh.ideal.web.comm.action.BaseAction.execute(BaseAction.java:71) 
org.springframework.web.struts.DelegatingActionProxy.execute(DelegatingActionProxy.java:110) 
org.apache.struts.action.RequestProcessor.processActionPerform(RequestProcessor.java:419) 
org.apache.struts.action.RequestProcessor.process(RequestProcessor.java:224) 
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1194) 
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:432) 
cn.sh.ideal.service.servlet.APPActionServlet.doPost(APPActionServlet.java:28) 
cn.sh.ideal.service.servlet.APPActionServlet.doGet(APPActionServlet.java:22) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:690) 
javax.servlet.http.HttpServlet.service(HttpServlet.java:803) 
cn.sh.ideal.service.servlet.UserFilter.doFilter(UserFilter.java:58) 
note The full stack trace of the root cause is available in the Apache Tomcat/5.5.23 logs

Answer 1

cn.sh.ideal.service.servlet.APPActionServlet.doPost(APPActionServlet.java:28)  
cn.sh.ideal.service.servlet.APPActionServlet.doGet(APPActionServlet.java:22) 
错误中提示的这个代码是你自己的程序吧。看看你的servlet都引用了什么类，什么方法，就是在你servlet中捕获的异常信息：java.lang.NullPointerException  。而且这个异常是一个servlet异常，名字也错误信息也告诉你了，是：javax.servlet.ServletException