org.apache.xalan.processor.transformerfactoryImpl not found问题

org.apache.xalan.processor.transformerfactoryImpl not found问题

       这个例子来自夏昕的《Spring开发指南》，虽然给出了详细的代码，可能是因为开发环境的差异却频频抛出异常。其中最重要的异常就是apache.xalan.processor.transformerfactoryImpl not found。经过一番奋战终于解决了这个问题。

1、开发环境

      JDK1.5、Tomcat 5.0.30、MyEclipse_55.1GA_E_FullStackInstaller。

2、index.jsp

<% ... @ page pageEncoding="utf-8" %>
<% ... @ taglib prefix="ww" uri="webwork" %>
< html >
   < body >
     < form  action ="login.action" >
       < p  align ="center" >
       登录 < br >
           < ww:if  test ="errorMessage != null" >
             < font  color ="red" >
               < ww:property  value ="errorMessage" />
             </ font >
           </ ww:if >
       </ p >
       用户名:
       < input  type ="text"  name ="model.username"   />
       < br >
       密 码 :
       < input  type ="password"  name ="model.password"   />
       < br >
       < p  align ="center" >
         < input  type ="submit"  value ="提交"  name ="B1" />
         < input  type ="reset"  value ="重置"  name ="B2" />
       </ p >
     </ form >
   </ body >
</ html >

3、main.jsp

<% ... @ taglib prefix="ww" uri="webwork" %>
< html >
   < body >
     < p  align ="center" > Login Success! </ p >
     < p  align ="center" > Welcome!
       < ww:property  value ="#session['username']" />
     </ p >
     < p  align ="center" >
       < b > Messages: </ b >< br >
       < ww:iterator  value ="messages"  status ="index" >
         < ww:if  test ="#index.odd==true" >
          ! < ww:property />< br >
         </ ww:if >
         < ww:else >
          * < ww:property />< br >
         </ ww:else >
       </ ww:iterator >
     </ p >
   </ body >
</ html >

4、web.xml

<? xml version="1.0" encoding="UTF-8" ?>
< web-app  version ="2.4"  
    xmlns ="http://java.sun.com/xml/ns/j2ee"  
    xmlns:xsi ="http://www.w3.org/2001/XMLSchema-instance"  
    xsi:schemaLocation ="http://java.sun.com/xml/ns/j2ee 
    http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd" >   
   < servlet >
       < servlet-name > webwork </ servlet-name >
       < servlet-class > com.opensymphony.webwork.dispatcher.ServletDispatcher </ servlet-class >
   </ servlet >   
   < servlet-mapping >
       < servlet-name > webwork </ servlet-name >
       < url-pattern > *.action </ url-pattern >
   </ servlet-mapping >   
   < servlet >
       < servlet-name > velocity </ servlet-name >  
           < servlet-class > com.opensymphony.webwork.views.velocity.WebWorkVelocityServlet </ servlet-class >  
           < load-on-startup > 1 </ load-on-startup >  
   </ servlet >
   < servlet-mapping >
       < servlet-name > velocity </ servlet-name >  
       < url-pattern > *.vm </ url-pattern >  
   </ servlet-mapping >    < welcome-file-list >
     < welcome-file > index.jsp </ welcome-file >
   </ welcome-file-list >
</ web-app >

5、xwork.xml

<? xml version="1.0" encoding="UTF-8" ?>
<! DOCTYPE xwork PUBLIC "-//OpenSymphony Group//XWork 1.0//EN" "xwork-1.0.dtd"  >
< xwork >
   < include  file ="webwork-default.xml" ></ include >
   < package  name ="default"  extends ="webwork-default" >
     < action  name ="login"  class ="com.spring.LoginAction" >
       < result  name ="success"  type ="dispatcher" >
         < param  name ="location" > /main.jsp </ param >
       </ result >
       < result  name ="loginfail"  type ="dispatcher" >
         < param  name ="location" > /index.jsp </ param >
       </ result >
       < interceptor-ref  name ="params" ></ interceptor-ref >
       < interceptor-ref  name ="model-driven" ></ interceptor-ref >
     </ action >     
   </ package >
</ xwork >

6、LoginAction.java和LoginInfo.java

public   class  LoginAction  implements  Action , ModelDriven  ... {    
    private final static String LOGIN_FAIL = "loginfail";
    LoginInfo loginInfo = new LoginInfo();
    public Object getModel() ...{
        return loginInfo;
    }
    public String execute() throws Exception ...{
        if("mypass".equals(loginInfo.getPassword())&&"erica".equalsIgnoreCase(loginInfo.getUsername()))...{
            ActionContext ctx = ActionContext.getContext();
            Map session = ctx.getSession();
            session.put("username", loginInfo.getUsername());
            loginInfo.getMessages().add("message1");
            loginInfo.getMessages().add("message2");
            loginInfo.getMessages().add("message3");
            return SUCCESS;
        }else...{
            loginInfo.setErrorMessage("Username/Password Error!");
            return LOGIN_FAIL;
        }        
    }
}

public   class  LoginInfo  ... {
    private String password;
    private String username;
    private List messages = new ArrayList();
    private String errorMessage;
                     ...
}

7、webwork.properties

      如果不加上这个文件，在偶的环境中就会报找不到该文件的异常，因此我就到webwork的jar包里找到default.properties，改一下名字就可以了。

8、目录结构

webWork
      |__src
      |      |_com.spring
      |               |_LoginAction.java
      |               |_LoginInfo.java
      |_WebRoot
            |_META-INF
            |_WEB-INF
            |         |_lib
            |         |_classes
            |         |        |_webwork.properties
            |         |        |_xwork.xml
            |         |        |_com.spring
            |         |                   |_LoginAction.class和LoginInfo.class
            |         |_web.xml
            |_index.jsp
            |_main.jsp

9、测试

      按照上面的步骤，运行会报org.apache.xalan.processor.transformerfactoryImpl not found的异常，从网上下载xalan-j_2_7_0-bin-2jars包，把包内的几个jar文件都拷贝到项目的lib中，实际上还要把其中的xml-apis.jar和xercesImpl.jar覆盖掉Tomcat安装目录下的common/endorsed下的两个文件。之所以要覆盖掉是因为Tomcat的版本太低的缘故。