java wicket error!_问答_开发者_运维开发者技术经验分享

This is my code,

package com.mywicketapp;

import java.util.ArrayList;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Locale;

import org.apache.wicket.ajax.AjaxRequestTarget;
import org.apache.wicket.ajax.form.AjaxFormSubmitBehavior;
import org.apache.wicket.markup.html.basic.Label;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.model.Model;
import org.apache.wicket.util.string.Strings;
import org.apache.wicket.markup.html.WebPage;
import org.apache.wicket.extensions.ajax.markup
   .html.autocomplete.AutoCompleteTextField;

public class  HomePage extends WebPage
{
  public HomePage()
  {
  Form form = new Form("form");
  add(form);

  final AutoCompleteTextField field = 
  new AutoCompleteTextField("auto", new Model(""))
  {
  protected Iterator getChoices(String input)
  {
  if (Strings.isEmpty(input))
 {
 return Collections.EMPTY_LIST.iterator();
  }

  List choices = new ArrayList(10);

 Locale[] locales = Locale.getAvailableLocales();

 for (int i = 0; i < locales.length; i++)
 {
  final Locale locale = locales[i];
  final String country = locale.getDisplayCountry();

if (country.toUpperCase().startsWith(input.toUpperCase()))
 {
  choices.add(country);
  if (choices.size() == 10)
 {
  break;
  }
 }
 }
 return choices.iterator();
 }
  };
  form.add(field);

final Label label = new 
 Label("selectedValue", field.getModel());
  label.setOutputMarkupId(true);
 form.add(label);
 field.add(new AjaxFormSubmitBehavior(form, "onchange")
 {
  protected void onSubmit(AjaxRequestTarget target)
  {
 target.addComponent(label);
 }

  @Override
 protected void onError(AjaxRequestTarget target)
 {
  }
  });
  }
}

This is my application code:

package com.mywicketapp;

import org.apache.wicket.protocol.http.WebApplication;

/**
 * Application object for your web application. If you want to run this application without deploying, run the Start class.
 * 
 * @see com.mywicketapp.Start#main(String[])
 */
public class WicketApplication extends WebApplication
{    
    /**
     * Constructor
     */
    public WicketApplication()
    {
    }

    /**
     * @see org.apache.wicket.Application#getHomePage()
     */
    public Class<HomePage> getHomePage(){
          return HomePage.class;  
          }

}

Some html:

<html>
  <head>
  <title></title>
  <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
  </head>
  <body>
  The textfield below will autocomplete country names
  <br><hr>
  <form wicket:id="form">
 Selected value is: <span wicket:id="selectedValue"></span>
 <br/>
  Country: <开发者_如何学运维;input type="text" wicket:id="auto" size="20"/>
 </form>
  </body>
</html>

And the error:

- log                        - Logging to org.slf4j.impl.Log4jLoggerAdapter(org.mortbay.log) via org.mortbay.log.Slf4jLog
>>> STARTING EMBEDDED JETTY SERVER, PRESS ANY KEY TO STOP
INFO  - log                        - jetty-6.1.25
INFO  - log                        - NO JSP Support for /, did not find org.apache.jasper.servlet.JspServlet
WARN  - log                        - failed wicket.mywicketapp: java.lang.ClassCastException: wicket.extensions.Initializer cannot be cast to org.apache.wicket.IInitializer
ERROR - log                        - Failed startup of context org.mortbay.jetty.webapp.WebAppContext@66e7b3f2{/,src/main/webapp}
java.lang.ClassCastException: wicket.extensions.Initializer cannot be cast to org.apache.wicket.IInitializer
    at org.apache.wicket.Application.addInitializer(Application.java:864)
    at org.apache.wicket.Application.load(Application.java:938)
    at org.apache.wicket.Application.initializeComponents(Application.java:715)
    at org.apache.wicket.protocol.http.WicketFilter.init(WicketFilter.java:732)
    at org.mortbay.jetty.servlet.FilterHolder.doStart(FilterHolder.java:97)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.servlet.ServletHandler.initialize(ServletHandler.java:662)
    at org.mortbay.jetty.servlet.Context.startContext(Context.java:140)
    at org.mortbay.jetty.webapp.WebAppContext.startContext(WebAppContext.java:1272)
    at org.mortbay.jetty.handler.ContextHandler.doStart(ContextHandler.java:517)
    at org.mortbay.jetty.webapp.WebAppContext.doStart(WebAppContext.java:489)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at org.mortbay.jetty.handler.HandlerWrapper.doStart(HandlerWrapper.java:130)
    at org.mortbay.jetty.Server.doStart(Server.java:224)
    at org.mortbay.component.AbstractLifeCycle.start(AbstractLifeCycle.java:50)
    at com.mywicketapp.Start.main(Start.java:43)
INFO  - log                        - Started SelectChannelConnector@0.0.0.0:8080

Looks to me like you have a version incompatibility problem... Check to make sure that the version of wicket-extensions that you're using is compatible with your wicket version. The wicket.extensions.Initializer that's getting loaded and causing the exception is surely getting loaded up by your AutoCompleteTextField.

java wicket error!

精彩评论

关注公众号

热门标签

图文推荐

java wicket error!

更多 问答 相关资讯：

精彩评论

关注公众号

热门标签

图文推荐

更多问答相关资讯：