struts2框架问题

Question

大侠们，我点击<a href="BbssectorAction!list.action">论坛</a>的时候，触发到
package com.news.action;import java.util.HashMap;
import java.util.List;
import java.util.Map;import com.news.dao.BbssectorDAO;
import com.news.dao.impl.BbssectorDAOImpl;
import com.news.model.Bbssector;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.ActionSupport;public class BbssectorAction extends ActionSupport{
private int id;
private Bbssector bbssector;
public int getId() {
return id;
}
public void setId(int id) {
this.id = id;
}
public Bbssector getBbssector() {
return bbssector;
}
public void setBbssector(Bbssector bbssector) {
this.bbssector = bbssector;
}
public String execute() throws Exception
{
return SUCCESS;
}
public String list() throws Exception
{
String result="";
BbssectorDAO bbssectorDAO=new BbssectorDAOImpl();
List list=bbssectorDAO.searchAllBbssector();
System.out.println(list);
if(list!=null)
{
ActionContext act=ActionContext.getContext();
Map map=act.getSession(); 
map.put("sector", list);
result="sector";
}
else
{
result="error";
}
return result;
}

}
struts.xml的配置文件如下：
<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE struts PUBLIC
    "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
    "http://struts.apache.org/dtds/struts-2.0.dtd"><struts>
     <constant name="struts.enable.DynamicMethodInvocation" value="true" />
    <constant name="struts.devMode" value="false" />
<constant name="struts.multipart.saveDir" value="/tmp"/>    <package name="default" namespace="/" extends="struts-default">
      <action name="BbssectorAction" class="com.news.action.BbssectorAction">
       <result name="sector">/sector.jsp</result>
       <result name="error">/error.jsp</result>
      </action>
    </package></struts>
点击的时候抛出：
HTTP Status 500 -type Exception reportmessagedescription The server encountered an internal error () that prevented it from fulfilling this request.exceptionjava.lang.NullPointerException
org.apache.struts2.impl.StrutsActionProxy.getErrorMessage(StrutsActionProxy.java:69)
com.opensymphony.xwork2.DefaultActionProxy.prepare(DefaultActionProxy.java:185)
org.apache.struts2.impl.StrutsActionProxy.prepare(StrutsActionProxy.java:63)
org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy(StrutsActionProxyFactory.java:39)
com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy(DefaultActionProxyFactory.java:58)
org.apache.struts2.dispatcher.Dispatcher.serviceAction(Dispatcher.java:500)
org.apache.struts2.dispatcher.FilterDispatcher.doFilter(FilterDispatcher.java:434)
com.news.action.util.FCKFilter.doFilter(FCKFilter.java:21)note The full stack trace of the root cause is available in the Apache Tomcat/6.0.35 logs.
Apache Tomcat/6.0.35
不知怎么解决，求大侠指点strutsaction

Answer 1

com.news.action.util.FCKFilter.doFilter(FCKFilter.java:21)

Answer 2

package com.news.action.util;import java.io.IOException; import javax.servlet.FilterChain; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.http.HttpServletRequest; 
import org.apache.struts2.dispatcher.FilterDispatcher;
@SuppressWarnings("deprecation")
public class FCKFilter extends FilterDispatcher {
 public void doFilter(ServletRequest req,ServletResponse res, FilterChain chain) throws IOException, ServletException {   
        HttpServletRequest request = (HttpServletRequest) req;  
        String URI = request.getRequestURI(); 
        String[] uriArray = URI.split("/ckfinder/core/connector/java/*/"); 
        int arrayLen = uriArray.length; 
        if (arrayLen >= 2) { 
            chain.doFilter(req, res);  
        }else { 
            super.doFilter(req, res, chain);   
        } 
    }  
} 

Answer 3

com.news.action.util.FCKFilter.doFilter(FCKFilter.java:21) 这个是我自定义的一个拦截器来的

Answer 4

web.xml里面是不是要改下
<filter>
   <filter-name>struts2</filter-name>
   <filter-class>
   com.news.action.util.FCKFilter.doFilter
   </filter-class>
  </filter>
  <filter-mapping>
   <filter-name>struts2</filter-name>
   <url-pattern>/*</url-pattern>
  </filter-mapping>
设置成你自己定义的过滤器

Answer 5

空指针，打个断点，debug下，找出来很快

Answer 6

已经设置了，还是不行呢，我的web.xml如下
<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" version="3.0">
  <display-name></display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  <servlet>
    <servlet-name>ConnectorServlet</servlet-name>
    <servlet-class>com.ckfinder.connector.ConnectorServlet</servlet-class>
    <init-param>
      <param-name>XMLConfig</param-name>
      <param-value>/WEB-INF/config.xml</param-value>
    </init-param>
    <init-param>
      <param-name>debug</param-name>
      <param-value>false</param-value>
    </init-param>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>ConnectorServlet</servlet-name>
    <url-pattern>
/ckfinder/core/connector/java/connector.java
</url-pattern>
  </servlet-mapping>
  <filter>
    <filter-name>FileUploadFilter</filter-name>
    <filter-class>com.ckfinder.connector.FileUploadFilter</filter-class>
    <init-param>
      <param-name>sessionCookieName</param-name>
      <param-value>JSESSIONID</param-value>
    </init-param>
    <init-param>
      <param-name>sessionParameterName</param-name>
      <param-value>jsessionid</param-value>
    </init-param>
  </filter>
  <filter-mapping>
    <filter-name>FileUploadFilter</filter-name>
    <url-pattern>
/ckfinder/core/connector/java/connector.java
       </url-pattern>
  </filter-mapping>
  <session-config>
    <session-timeout>10</session-timeout>
  </session-config>
  <filter>
    <filter-name>struts2</filter-name>
    <filter-class>com.news.action.util.FCKFilter</filter-class>
  </filter>
  <filter-mapping>
    <filter-name>struts2</filter-name>
    <url-pattern>/*</url-pattern>
  </filter-mapping>
  <servlet>
    <servlet-name>Faces Servlet</servlet-name>
    <servlet-class>javax.faces.webapp.FacesServlet</servlet-class>
    <load-on-startup>1</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>Faces Servlet</servlet-name>
    <url-pattern>/faces/*</url-pattern>
  </servlet-mapping>
</web-app>

Answer 7

这个空指针还没进去方法里面就抛出来的，所以debug没有呢，我想可能是拦截器的问题。

Answer 8

还没运行到action的方法的，所以我debug之后没有在断电停留，估计是拦截器出问题的

Answer 9

<action name="BbssectorAction" class="com.news.action.BbssectorAction" method="list"> 默认的是execute方法。

Answer 10

我这这样写的<a href="BbssectorAction!list.action">论坛</a>，所以不用加list的，以前的代码都是这样，没问题的哦。

Answer 11

我自定义的拦截器如下：
package com.news.action.util;import java.io.IOException; import javax.servlet.FilterChain; 
import javax.servlet.ServletException; 
import javax.servlet.ServletRequest; 
import javax.servlet.ServletResponse; 
import javax.servlet.http.HttpServletRequest; 
import org.apache.struts2.dispatcher.FilterDispatcher;
@SuppressWarnings("deprecation")
public class FCKFilter extends FilterDispatcher {
 public void doFilter(ServletRequest req,ServletResponse res, FilterChain chain) throws IOException, ServletException {   
        HttpServletRequest request = (HttpServletRequest) req;  
        String URI = request.getRequestURI(); 
        String[] uriArray = URI.split("/ckfinder/core/connector/java/*/"); 
        int arrayLen = uriArray.length; 
        if (arrayLen >= 2) { 
            chain.doFilter(req, res);  
        }else { 
            super.doFilter(req, res, chain);   
        } 
    }  
} 
因为我要用到ckfinder,ckeditor来上传图片和在线编辑，所以弄了个这样的过滤器，不知这个有没有问题。