Structs 错误，请高手来指导下啊

Question

我初学JAVA ，遇到这个问题，不知道怎么解决，请高手指导下，万分感激HTTP Status 500 - --------------------------------------------------------------------------------type Exception reportmessage description The server encountered an internal error () that prevented it from fulfilling this request.exception javax.servlet.ServletException: java.lang.NullPointerException
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:286)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
root cause java.lang.NullPointerException
org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:289)
org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:357)
org.apache.struts.chain.commands.CreateActionForm.execute(CreateActionForm.java:92)
org.apache.struts.chain.commands.ActionCommandBase.execute(ActionCommandBase.java:51)
org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
org.apache.commons.chain.generic.LookupCommand.execute(LookupCommand.java:305)
org.apache.commons.chain.impl.ChainBase.execute(ChainBase.java:191)
org.apache.struts.chain.ComposableRequestProcessor.process(ComposableRequestProcessor.java:283)
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
javax.servlet.http.HttpServlet.service(HttpServlet.java:637)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
note The full stack trace of the root cause is available in the Apache Tomcat/6.0.18 logs.

Answer 1

Apache Tomcat/6.0.18 logs日志下会有错误显示！

Answer 2

java.lang.NullPointerException
org.apache.struts.action.ActionServlet.process(ActionServlet.java:1913)
org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:462)
空指针异常~~~ 看看这两个地方..

Answer 3

java.lang.NullPointerException
org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:289)
org.apache.struts.config.FormBeanConfig.createActionForm(FormBeanConfig.java:357)struts.xml文件位置放错了？放在src下面。

Answer 4

javax.servlet.ServletException: java.lang.NullPointerException
是空指针异常,导致servlet中编译出问题..贴代码先!

Answer 5

楼主也是转行学JAVA的吧，我当年也是一直将其叫做 Structs 

Answer 6

谢谢大家的指导，我尝试改了几次，还是不行啊Struts-config.xml代码如下
<?xml version="1.0" encoding="ISO-8859-1" ?><!DOCTYPE struts-config PUBLIC
          "-//Apache Software Foundation//DTD Struts Configuration 1.2//EN"
          "http://jakarta.apache.org/struts/dtds/struts-config_1_2.dtd">
<struts-config>
   <form-beans>
   <form-bean name="loginForm" type="com.bjsxt.structs.LoginActionForm"></form-bean>
   </form-beans>
   
   
   <action-mappings>
       <action path="/login"
               type="com.bjsxt.struts.LoginAction"
               name="loginForm"
               scope="request"       
       >
       <forward name="success" path="/login_success.jsp"/>
        <forward name="error" path="/login_error.jsp"/>
       </action>
   </action-mappings>
   
</struts-config>LoginAction如下：
package com.bjsxt.struts;import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;import org.apache.struts.action.Action;
import org.apache.struts.action.ActionForm;
import org.apache.struts.action.ActionForward;
import org.apache.struts.action.ActionMapping;
/**
 * 用户登录的Action
 * @author Administrator
 *
 */
public class LoginAction extends Action { public ActionForward execute(ActionMapping mapping, ActionForm form,
HttpServletRequest request, HttpServletResponse response)
throws Exception {
LoginActionForm laf=(LoginActionForm)form;
String username=laf.getUsername();
String password=laf.getPassword();
if("admin".equals(username)&&"admin".equals(password)){
//转向到登录成功页面
request.setAttribute("username", username);
return mapping.findForward("success");
}else{
//转向登录失败页面
return mapping.findForward("error");
}



}}

Answer 7

按8，9楼所说的也不行啊 ，
错误提示如下
type Status reportmessage Servlet action is not availabledescription The requested resource (Servlet action is not available) is not available.

Answer 8

 这样改不行啊   admin又不是对象

Answer 9

<form-bean name="loginForm" type="com.bjsxt.structs.LoginActionForm"></form-bean>
type="com.bjsxt.struts.LoginAction"
你的Action和Form放在一个包下的。两个拼写不一样哦
看好哦！让我找出来了