新手请教问题 - ITeye问答

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新手请教问题10

初学DWR，现在有如下问题：
在dwr.xml下面配置自定义的类时会报错，类找不到。但是我的类明明在com.hl.dwr下了啊。而且已经编译好了classes也有。
在网上找了好久，都找不到是什么原因。请各位高手帮我一下。
警告: Error setting class=com.hl.dwr.Hello on org.directwebremoting.create.NewCreator
java.lang.IllegalArgumentException: Class not found: com.hl.dwr.Hello
at org.directwebremoting.create.NewCreator.setClass(NewCreator.java:46)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.directwebremoting.util.LocalUtil.setProperty(LocalUtil.java:388)
at org.directwebremoting.util.LocalUtil.setParams(LocalUtil.java:347)
at org.directwebremoting.impl.DefaultCreatorManager.addCreator(DefaultCreatorManager.java:96)
at org.directwebremoting.impl.DwrXmlConfigurator.loadCreate(DwrXmlConfigurator.java:274)
at org.directwebremoting.impl.DwrXmlConfigurator.loadAllows(DwrXmlConfigurator.java:224)
at org.directwebremoting.impl.DwrXmlConfigurator.configure(DwrXmlConfigurator.java:170)
at org.directwebremoting.impl.ContainerUtil.configureFromDefaultDwrXml(ContainerUtil.java:264)
at org.directwebremoting.impl.ContainerUtil.configureContainerFully(ContainerUtil.java:421)
at org.directwebremoting.servlet.DwrServlet.init(DwrServlet.java:79)
at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1091)
at org.apache.catalina.core.StandardWrapper.allocate(StandardWrapper.java:750)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:130)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
2008-8-29 11:23:14 org.directwebremoting.util.CommonsLoggingOutput error
严重: Creator: 'NewCreator[Hello]' for Hello.js is returning null for type queries.
2008-8-29 11:23:14 org.directwebremoting.util.CommonsLoggingOutput warn
警告: Names of known classes are: JDate
2008-8-29 11:23:14 org.directwebremoting.util.CommonsLoggingOutput warn
警告: Unhandled Exception
java.lang.SecurityException: No class by name: Hello
at org.directwebremoting.impl.DefaultCreatorManager.getCreator(DefaultCreatorManager.java:189)
at org.directwebremoting.impl.DefaultRemoter.generateInterfaceScript(DefaultRemoter.java:158)
at org.directwebremoting.servlet.InterfaceHandler.handle(InterfaceHandler.java:50)
at org.directwebremoting.servlet.UrlProcessor.handle(UrlProcessor.java:101)
at org.directwebremoting.servlet.DwrServlet.doPost(DwrServlet.java:146)
at org.directwebremoting.servlet.DwrServlet.doGet(DwrServlet.java:132)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Thread.java:595)
我的dwr.xml如下

<!----> 
 
<dwr>
  <allow> 
    <create creator="new" javascript="JDate"> 
       
    </create>
    <create creator="new" javascript="Hello"> 
       
    </create>
  </allow>
</dwr>

我的web.xml如下

<!---->
<web-app 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" version="2.4">
  <display-name>WebModule1</display-name>
  <servlet>
    <servlet-name>dwr-invoker</servlet-name>
    <servlet-class>org.directwebremoting.servlet.DwrServlet</servlet-class>
    <init-param>
      <param-name>debug</param-name>
      <param-value>true</param-value>
    </init-param>
    <init-param>
      <param-name>classes</param-name>
      <param-value>java.lang.Object</param-value>
    </init-param>
  </servlet>
  <servlet-mapping>
    <servlet-name>dwr-invoker</servlet-name>
    <url-pattern>/dwr/*</url-pattern>
  </servlet-mapping>
  <servlet>
    <description>Added by JBuilder to compile JSPs with debug info</description>
    <servlet-name>debugjsp</servlet-name>
    <servlet-class>org.apache.jasper.servlet.JspServlet</servlet-class>
    <init-param>
      <param-name>classdebuginfo</param-name>
      <param-value>true</param-value>
    </init-param>
    <load-on-startup>3</load-on-startup>
  </servlet>
  <servlet-mapping>
    <servlet-name>debugjsp</servlet-name>
    <url-pattern>*.jsp</url-pattern>
  </servlet-mapping>
</web-app>

java代码

package com.hl.dwr;
public class Hello {
    public String SayHello(String user){
        return "hello"+user;
    }
}

jsp

<html> 
<head> 
<title> 
<script type="text/javascript" src="dwr/interface/JDate.js"></script> 
<script type="text/javascript" src="dwr/interface/Hello.js"></script> 
<script type="text/javascript" src="dwr/engine.js"></script> 
<script type="">
function hello(){ 
  var user = document.getElementById("username").value;
  Hello.SayHello(user,load);
} 
function load(data){ 
alert(data) 
} 
function getdate(){ 
  JDate.getDate(Dateload);
} 
function Dateload(data){ 
alert(data) 
} 
</script> 
</head> 
<body onload="getdate()"> 
<input id="username" type="text">
<input type="button">
</body> 
</html>

Jdate就好用，可以找到类。这是为什么？

问题补充：
我的classes路径：C:\Documents and Settings\Administrator\jbproject\Dwr\classes\com\hl\dwr
Jbuilder的output path
C:/Documents and Settings/Administrator/jbproject/Dwr/classes

问题补充：
我的类就在C:\Documents and Settings\Administrator\jbproject\Dwr\classes\com\hl\dwr
这里可以找到。

我想问问DWR是如何匹配我这个路径的？？？？？？他默认的包位置放在哪？我要是想改变该如何去配置？？

为什么jdk原有的包下(java.util.Date)就可以找到。但是我自定义的包(com.hl.dwr)就找不到

DWR