2013年12月1日星期日

Exception occurred during processing request: null seeking help

Daniel Help me find this rookie Daniel it really does not know that there is a problem





------ Solution ------- -------------------------------------
configuration file header information is not 

  应该是
  <?xml version="1.0" encoding="gbk"?>
  <!DOCTYPE struts PUBLIC
      "-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
      "http://struts.apache.org/dtds/struts-2.0.dtd">
  
  你的是
  <!DOCTYPE truts PUBLIC
  
  少了一个s

------ Solution ------------------------------------- -------
addition to your namespace = "/ hello".
your form in the form of action can not be hello bar. You can change the namespace = "/", or action = "hello.hello"
------ Solution ------------------- -------------------------
if namespace = "/" then hello.action
--- --- Solution --------------------------------------------
Since you changed over to the namespace "/" , then the form of the action = "hello.action" a .
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are you seeing this
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strong ah Oh this I changed over , 3L proposal also heard , but still the same error amount , why ah
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Here I have changed, but still the same error ah
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I paste the code in order to facilitate it 
package com;
  
  public class HelloAction {
  
  	private String message;
  	public String getMessage()
  	{
  		return message;
  	}
  	public void setMessage(String message)
  	{
  		this.message=message;
  	}
  	public String execute()
  	{
  		System.out.println("............");
  		if((this.message.equals(""))||(this.message==null))
  		{
  			message="请输入问候语";
  		}
  		return "success";
  		
  	}
  }
  

<?xml version="1.0" encoding="GBK"?>
  <!DOCTYPE struts PUBLIC
  	"-//Apache Software Foundation//DTD Struts Configuration 2.0//EN"
  	"http://struts.apache.org/dtds/struts-2.0.dtd">
  	<struts>
  	<package name="com" extends="struts-default" namespace="/" >
  	
  	<action name="hello" class="com.HelloAction">
  	<result name="success">/hello.jsp</result>
  	</action>
  	</package>
  	</struts>

<?xml version="1.0" encoding="UTF-8"?>
  <web-app version="3.0" 
  	xmlns="http://java.sun.com/xml/ns/javaee" 
  	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
  	xsi:schemaLocation="http://java.sun.com/xml/ns/javaee 
  	http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd">
    <display-name></display-name>	
    <welcome-file-list>
      <welcome-file>index.jsp</welcome-file>
    </welcome-file-list>
  <filter>
          <filter-name>struts2Filter</filter-name>
          <filter-class>
          	org.apache.struts2.dispatcher.FilterDispatcher
          </filter-class>
      </filter>
      <filter-mapping>
          <filter-name>struts2Filter</filter-name>
          <url-pattern>/*</url-pattern>
      </filter-mapping>
  </web-app>
  

<%@ page language="java" import="java.util.*" pageEncoding="utf-8"%>
  <%@ taglib prefix="s" uri="/struts-tags"%>
  
  <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
  <html>
    <head>
  <title>问候程序</title>
  
    </head>
    
    <body>
  <s:property value="message"/>
  <s:form action="hello">
  <s:textfield name="message" label="问候语 " value=""/>
  <br>
  <s:submit value="提交"/>
  
  
  </s:form>
    </body>
  </html>




error code :2013-3-14 13:59:17 com.opensymphony.xwork2.util.logging.commons.CommonsLogger error
serious : Exception occurred during processing request: null
java.lang.NullPointerException
at org.apache.struts2.impl.StrutsActionProxy.getErrorMessage (StrutsActionProxy.java: 69)
at com.opensymphony.xwork2.DefaultActionProxy.prepare (DefaultActionProxy.java: 185)
at org.apache.struts2.impl.StrutsActionProxy.prepare (StrutsActionProxy.java: 63)
at org.apache.struts2.impl.StrutsActionProxyFactory.createActionProxy (StrutsActionProxyFactory.java: 39)
at com.opensymphony.xwork2.DefaultActionProxyFactory.createActionProxy (DefaultActionProxyFactory.java: 58)
at org.apache.struts2.dispatcher.Dispatcher.serviceAction (Dispatcher.java: 534)
at org.apache.struts2.dispatcher.FilterDispatcher.doFilter (FilterDispatcher.java: 434)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter (ApplicationFilterChain.java: 235)
at org.apache.catalina.core.ApplicationFilterChain.doFilter (ApplicationFilterChain.java: 206)
at org.apache.catalina.core.StandardWrapperValve.invoke (StandardWrapperValve.java: 233)
at org.apache.catalina.core.StandardContextValve.invoke (StandardContextValve.java: 191)
at org.apache.catalina.core.StandardHostValve.invoke (StandardHostValve.java: 127)
at org.apache.catalina.valves.ErrorReportValve.invoke (ErrorReportValve.java: 102)
at org.apache.catalina.core.StandardEngineValve.invoke (StandardEngineValve.java: 109)
at org.apache.catalina.connector.CoyoteAdapter.service (CoyoteAdapter.java: 298)
at org.apache.coyote.http11.Http11Processor.process (Http11Processor.java: 859)
at org.apache.coyote.http11.Http11Protocol $ Http11ConnectionHandler.process (Http11Protocol.java: 588)
at org.apache.tomcat.util.net.JIoEndpoint $ Worker.run (JIoEndpoint.java: 489)
at java.lang.Thread.run (Thread.java: 619)

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+1
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put it into hello.action eh ? ?
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I get is based on your approach and then you see a warning message is the same mistake ah


2013-3-14 20:21:56 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
WARNING : No configuration found for the specified action: 'hello.action' in namespace:.'' Form action defaulting to 'action' attribute's literal value.
2013-3-14 20:21:56 com.opensymphony.xwork2.util.logging.commons.CommonsLogger warn
WARNING : No configuration found for the specified action: 'hello.action' in namespace:.'' Form action defaulting to 'action' attribute's literal value.
2013-3-14 20:21:57 org.apache.catalina.startup.HostConfig checkResources
Information : Reloading context [/ ssts]
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not find hello.action directory is not action configuration problem ah
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changed

In addition to your struts.xml in line with warnings it?
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details without warning is a problem I
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Thank you solve the problem
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how to solve ah ?
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how to solve
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this post pit father
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I appear this error was originally written struts.xml I structs.xml. . . . . . . . . . . . . . .
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parade , brother to curse , the landlord can not be so shameless you do not , fuck
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lzsb, the solution does not stick , obviously your mistakes and say ls crowd had nothing
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landlord Kengren ah ! By , the solutions do come out ah ? ? ?
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