http://www.wicket-library.com/wicket-examples-6.0.x/ajax/
调试了两天，ajax 模态窗程序

下面是一个ajax的wicket项目中，程序中只写了模态窗口部分程序，编译的时候能通过，运行的时候总是出现：


Can't instantiate page using constructor 'public org.apache.wicket.examples.Index()'. Might be it doesn't exist, may be it is not visible (public).


请各位看看这个，有什么问题呢，谢谢

AjaxApplication.java


public class AjaxApplication extends WicketExampleApplication
{
   /**
    * Constructor.
    */
   public AjaxApplication()
   {
   }

   /**
    * @see org.apache.wicket.examples.WicketExampleApplication#init()
    */
   @Override
   protected void init()
   {
       super.init();

       getApplicationSettings().setUploadProgressUpdatesEnabled(true);

       getResourceSettings().setThrowExceptionOnMissingResource(false);

       getRequestCycleSettings().addResponseFilter(new AjaxServerAndClientTimeFilter());

       getDebugSettings().setAjaxDebugModeEnabled(true);

       mountPage("modal-window", ModalWindowPage.class);

   }


   /**
    * @see org.apache.wicket.Application#getHomePage()
    */
   @Override
   public Class<? extends Page> getHomePage()
   {
       return Index.class;
   }
}

Index.java

public class Index extends BasePage
{
	
	/**
	 * Constructor.
	 */
    public Index()
    
    {
   
    	
    }
}

Index.html


<?xml version="1.0" encoding="UTF-8" ?>
<wicket:extend xmlns:wicket="http://wicket.apache.org">

<wicket:link>

<a href="ModalWindowPage.html">Modal window</a>: javascript modal window example
<br/><br/>

</wicket:link>

</wicket:extend>

模态窗口的程序和网站上的是一样的

ModalContent1Page.java

public class ModalContent1Page extends WebPage
{

	/**
	 * 
	 * @param modalWindowPage
	 * @param window
	 */
	public ModalContent1Page(final PageReference modalWindowPage, final ModalWindow window)
	{
		add(new AjaxLink<Void>("closeOK")
		{
			@Override
			public void onClick(AjaxRequestTarget target)
			{
				if (modalWindowPage != null)
					((ModalWindowPage)modalWindowPage.getPage()).setResult("Modal window 1 - close link OK");
				window.close(target);
			}
		});

		add(new AjaxLink<Void>("closeCancel")
		{
			@Override
			public void onClick(AjaxRequestTarget target)
			{
				if (modalWindowPage != null)
					((ModalWindowPage)modalWindowPage.getPage()).setResult("Modal window 1 - close link Cancel");
				window.close(target);
			}
		});

		add(new DateTimeField("dateTimeField"));

		final ModalWindow modal;
		add(modal = new ModalWindow("modal"));

		modal.setCookieName("modal window 2");

		modal.setResizable(false);
		modal.setInitialWidth(30);
		modal.setInitialHeight(15);
		modal.setWidthUnit("em");
		modal.setHeightUnit("em");

		modal.setCssClassName(ModalWindow.CSS_CLASS_GRAY);

		modal.setPageCreator(new ModalWindow.PageCreator()
		{
			@Override
			public Page createPage()
			{
				return new ModalContent2Page(modal);
			}
		});

		modal.setCloseButtonCallback(new ModalWindow.CloseButtonCallback()
		{
			@Override
			public boolean onCloseButtonClicked(AjaxRequestTarget target)
			{
				target.appendJavaScript("alert('You can\\'t close this modal window using close button."
					+ " Use the link inside the window instead.');");
				return false;
			}
		});

		add(new AjaxLink<Void>("open")
		{
			@Override
			public void onClick(AjaxRequestTarget target)
			{
				modal.show(target);
			}
		});

	}
}


ModalContent2Page.java


public class ModalContent2Page extends WebPage
{

    /**
     * @param window
     */
    public ModalContent2Page(final ModalWindow window)
    {
        add(new AjaxLink<Void>("close")
        {
            private static final long serialVersionUID = 1L;

            @Override
            public void onClick(AjaxRequestTarget target)
            {
                window.close(target);
            }
        });


    }


}


ModalPanel1.java



public class ModalPanel1 extends Panel
{

    /**
     * @param id
     */
    public ModalPanel1(String id)
    {
        super(id);

        add(new DateTimeField("dateTimeField")
        {
            /**
             * @see org.apache.wicket.extensions.yui.calendar.DateTimeField#configure(java.util.Map)
             */
            @Override
            protected void configure(Map<String, Object> widgetProperties)
            {
                super.configure(widgetProperties);
                // IE 6 breaks layout with iframe - is that a YUI bug?
                widgetProperties.put("iframe", false);
            }
        });
    }

}


ModalContent1Page.html


<?xml version="1.0" encoding="UTF-8" ?>
<html xmlns:wicket="http://wicket.apache.org">
    <head>
        <title>This is modal window</title>
        <style type="text/css">         
            body {
                font-family: verdana, sans-serif;
                font-size: 82%;
                background-color: white;                
            }
        </style>
    </head> 
    <body>
        Modal WINDOW content.
        <p>
            <a wicket:id="closeOK">Close this window with result "OK"</a><br/>
            <a wicket:id="closeCancel">Close this window with result "Cancel"</a><br/>
        </p>
        <p>
            <div wicket:id="modal"></div>
            <a wicket:id="open">Open another modal dialog</a>           
        </p>
          
        <p>
          <div>An example of a component that uses header contributions</div>
          <div wicket:id="dateTimeField" />
        </p>
          
    </body>
</html>

ModalContent2Page.html


<?xml version="1.0" encoding="UTF-8" ?>
<html xmlns:wicket="http://wicket.apache.org">
    <head>
        <title>Modal dialog</title>
        <style type="text/css">
            body {
                font-family: verdana, sans-serif;
                font-size: 82%;
                background-color: #FFFEC4;              
            }
        </style>
    </head> 
    <body>
        This is modal window opened from another modal window. This one is not resizable.
        The window dimensions are specified in relative units (em).
        <p>
        <a wicket:id="close">Close this window</a><br/>
        </p>
    </body>
</html>

Modal1Panel1.html

<?xml version="1.0" encoding="UTF-8" ?>
<wicket:panel xmlns:wicket="http://wicket.apache.org">
    <div style="margin: 1em">
        This is panel content! 
        <p>
            Date text field to demonstrate AJAX header contribution <span wicket:id="dateTimeField"></span>
        </p>
    </div>
</wicket:panel>


ModalWindowPage.java



public class ModalWindowPage extends BasePage
{
    private String result;

    /**
     */
    public ModalWindowPage()
    {
        final Label result;
        add(result = new Label("result", new PropertyModel<String>(this, "result")));
        result.setOutputMarkupId(true);

        /*
         * First modal window
         */

        final ModalWindow modal1;
        add(modal1 = new ModalWindow("modal1"));

        modal1.setCookieName("modal-1");

        modal1.setPageCreator(new ModalWindow.PageCreator()
        {
            @Override
            public Page createPage()
            {
                return new ModalContent1Page(ModalWindowPage.this.getPageReference(), modal1);
            }
        });
        modal1.setWindowClosedCallback(new ModalWindow.WindowClosedCallback()
        {
            @Override
            public void onClose(AjaxRequestTarget target)
            {
                target.add(result);
            }
        });
        modal1.setCloseButtonCallback(new ModalWindow.CloseButtonCallback()
        {
            @Override
            public boolean onCloseButtonClicked(AjaxRequestTarget target)
            {
                setResult("Modal window 1 - close button");
                return true;
            }
        });

        add(new AjaxLink<Void>("showModal1")
        {
            @Override
            public void onClick(AjaxRequestTarget target)
            {
                modal1.show(target);
            }
        });

        /*
         * Second modal window
         */

        final ModalWindow modal2;
        add(modal2 = new ModalWindow("modal2"));

        modal2.setContent(new ModalPanel1(modal2.getContentId()));
        modal2.setTitle("This is modal window with panel content.");
        modal2.setCookieName("modal-2");
        


        modal2.setCloseButtonCallback(new ModalWindow.CloseButtonCallback()
        {
            @Override
            public boolean onCloseButtonClicked(AjaxRequestTarget target)
            {
                setResult("Modal window 2 - close button");
                return true;
            }
        });

        modal2.setWindowClosedCallback(new ModalWindow.WindowClosedCallback()
        {
            @Override
            public void onClose(AjaxRequestTarget target)
            {
                target.add(result);
            }
        });

        add(new AjaxLink<Void>("showModal2")
        {
            @Override
            public void onClick(AjaxRequestTarget target)
            {
                modal2.show(target);
            }
        });
    }

    /**
     * @return the result
     */
    public String getResult()
    {
        return result;
    }

    /**
     * @param result
     *            the result to set
     */
    public void setResult(String result)
    {
        this.result = result;
    }



}

ModalWindowPage.html


<?xml version="1.0" encoding="UTF-8" ?>
<wicket:extend xmlns:wicket="http://wicket.apache.org">
    Last modal window result: <span wicket:id="result"></span>
    
    <div wicket:id="modal1"></div>
    <a wicket:id="showModal1">Show modal dialog with a page</a>
    <br/>
    <div wicket:id="modal2"></div><br/>
    <a wicket:id="showModal2">Show modal dialog with panel</a>
</wicket:extend>

BasePage.java


public class BasePage extends WicketExamplePage
{
    /**
     * Constructor
     */
    public BasePage()
    {
        add(new BookmarkablePageLink<Void>("back", Index.class).setAutoEnable(true));
    }
}


BasePage.html


<?xml version="1.0" encoding="UTF-8" ?>
<html xmlns:wicket="http://wicket.apache.org">
<head>
    <title>Wicket Examples - Ajax</title>
    <link rel="stylesheet" type="text/css" href="style.css"/>
</head>
<body>
    <span wicket:id="mainNavigation"/>
    <a href="Index.html" wicket:id="back">[go back]</a><p/>
    <wicket:child/>
</body>
</html>


WicketExamplePage.java

public class WicketExamplePage extends WebPage
{
	/**
	 * 
	 */
	private static final long serialVersionUID = 1L;

	/**
	 * Constructor
	 */
	public WicketExamplePage()
	{
		this(new PageParameters());
	}

	/**
	 * Constructor
	 * 
	 * @param pageParameters
	 */
	public WicketExamplePage(final PageParameters pageParameters)
	{
		super(pageParameters);

		final String packageName = getClass().getPackage().getName();
		add(new WicketExampleHeader("mainNavigation", Strings.afterLast(packageName, '.'), this));
		explain();
	}


	/**
	 * Construct.
	 * 
	 * @param model
	 */
	public WicketExamplePage(IModel<?> model)
	{
		super(model);
	}

	/**
	 * Override base method to provide an explanation
	 */
	protected void explain()
	{
	}
}


WicketExampleApplication.java



public abstract class WicketExampleApplication extends WebApplication
{
	/**
	 * prevent wicket from launching a java application window on the desktop <br/>
	 * once someone uses awt-specific classes java will automatically do so and allocate a window
	 * unless you tell java to run in 'headless-mode'
	 */
	static
	{
		System.setProperty("java.awt.headless", "true");
	}


	/**
	 * Constructor.
	 */
	public WicketExampleApplication()
	{
	}

	/**
	 * @see org.apache.wicket.protocol.http.WebApplication#init()
	 */
	@Override
	protected void init()
	{
		// WARNING: DO NOT do this on a real world application unless
		// you really want your app's passwords all passed around and
		// stored in unencrypted browser cookies (BAD IDEA!)!!!

		// The NoCrypt class is being used here because not everyone
		// has the java security classes required by Crypt installed
		// and we want them to be able to run the examples out of the
		// box.
		getSecuritySettings().setCryptFactory(
			new ClassCryptFactory(NoCrypt.class, ISecuritySettings.DEFAULT_ENCRYPTION_KEY));

		getDebugSettings().setDevelopmentUtilitiesEnabled(true);
	}
}


错误：
ERROR - DefaultExceptionMapper     - Unexpected error occurred
org.apache.wicket.WicketRuntimeException: Can't instantiate page using constructor 'public org.apache.wicket.examples.Index()'. Might be it doesn't exist, may be it is not visible (public).
	at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:193)
	at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:66)
	at org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:133)
	at org.apache.wicket.core.request.handler.PageProvider.resolvePageInstance(PageProvider.java:278)
	at org.apache.wicket.core.request.handler.PageProvider.getPageInstance(PageProvider.java:166)
	at org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
	at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:94)
	at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:244)
	at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:165)
	at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:840)
	at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
	at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:254)
	at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:211)
	at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:282)
	at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:244)
	at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
	at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:267)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859)
	at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602)
	at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489)
	at java.lang.Thread.run(Thread.java:722)
Caused by: java.lang.reflect.InvocationTargetException
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
	at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
	at org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:174)
	... 28 more
Caused by: java.lang.NoClassDefFoundError: org/apache/wicket/devutils/debugbar/DebugBar
	at org.apache.wicket.examples.WicketExampleHeader.<init>(WicketExampleHeader.java:48)
	at org.apache.wicket.examples.WicketExamplePage.<init>(WicketExamplePage.java:54)
	at org.apache.wicket.examples.WicketExamplePage.<init>(WicketExamplePage.java:41)
	at org.apache.wicket.examples.BasePage.<init>(BasePage.java:28)
	at org.apache.wicket.examples.Index.<init>(Index.java:16)
	... 33 more
Caused by: java.lang.ClassNotFoundException: org.apache.wicket.devutils.debugbar.DebugBar
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1680)
	at org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1526)
	... 38 more
INFO  - PropertiesFactory          - Loading properties files from jar:file:/E:/Tomcat%206.0/wtpwebapps/ajax/WEB-INF/lib/wicket-core-6.5.0.jar!/org/apache/wicket/Application_zh_CN.properties with loader org.apache.wicket.resource.IsoPropertiesFilePropertiesLoader@1e32705
INFO  - PropertiesFactory          - Loading properties files from jar:file:/E:/Tomcat%206.0/wtpwebapps/ajax/WEB-INF/lib/wicket-core-6.5.0.jar!/org/apache/wicket/Application.properties with loader org.apache.wicket.resource.IsoPropertiesFilePropertiesLoader@1e32705
INFO  - xServerAndClientTimeFilter - 638ms server time taken for request  response size: 11190

帮忙看看~谢谢

框架太多，特别像这种类型的框架，估计用的人太少。。。建设你去官方论坛，或者到国外的网站看看。
另外，我觉得你还不如用JSF呢。

wicket的ajax需要几个js脚本的支持，参考wicket-examples源代码中的js、css等，copy过来就行了，特别是modalwindow的例子

modalwindow的例子

WicketExampleApplication.java  init() 方法
getDebugSettings().setDevelopmentUtilitiesEnabled(true);
这句去掉 或者设成false吧
报错很明显写着Caused by: java.lang.ClassNotFoundException: org.apache.wicket.devutils.debugbar.DebugBar
应该是你下的源码包不完全把 建议把wicket example 整个下下来
然后用 mvn install jetty:run 跑起来
页面与http://www.wicket-library.com/wicket-examples-6.0.x 一样

我同意 为什么要用wicket 好麻烦