ServerRpc 无法在自定义 Vaadin Widgetset 中工作，为什么我会收到“Widgetset '...' 不包含 '...' 的实现？

Question

我对 Vaadin 中的 ServerRpc 实现有疑问，我在 Eclipse 中有一个带有小部件集的简单示例项目：

这里是 classes:

widgetpackage.MarqueeLabel :

public class MarqueeLabel extends AbstractComponent {




/**

     * 

     */

private static final long serialVersionUID = 1L;



@Override

public MarqueeLabelState getState() {

       return (MarqueeLabelState) super.getState();

    }



@Override

public void setCaption(String caption) {

       getState().text = caption;

    } 




}

widgetpackage.WidgetUI:

public class WidgetUI extends UI {




@WebServlet(value = "/*", asyncSupported = true)

@VaadinServletConfiguration(productionMode = false, ui = WidgetUI.class, widgetset = "widgetpackage.widgetWidgetset")

public static class Servlet extends VaadinServlet {

    }




@Override

protected void init(VaadinRequest request) {

        final VerticalLayout layout = new VerticalLayout();

        layout.setMargin(true);

        setContent(layout);




        MarqueeLabel label = new MarqueeLabel();

        label.setCaption("Hello I am custom widget!");



        layout.addComponent(label);

    }




}

widgetpackage.client.MarqeeLabelWidget:

public class MarqueeLabelWidget extends Label {




    public MarqueeLabelWidget() {

            final Element el = getElement();

            el.getStyle().setPosition(Position.RELATIVE);



            Timer timer = new Timer() {

                private int left = 0;



                @Override

                public void run() {

                    el.getStyle().setLeft(left, Unit.PX);

                    left++;

                }

            };

            timer.scheduleRepeating(100);

        }



    }

widgetpackage.client.MarqueeLabelState: 

public class MarqueeLabelState extends AbstractComponentState {




/**

     * 

     */

private static final long serialVersionUID = 1L;




public String text;



}

widgetpackage.client.MarqueeLabelConnector:

@Connect(MarqueeLabel.class)

public class MarqueeLabelConnector extends AbstractComponentConnector {




/**

     * 

     */

private static final long serialVersionUID = 1L;




@Override

public Widget createWidget() {

        return GWT.create(MarqueeLabelWidget.class);

    }



@Override

public MarqueeLabelWidget getWidget() {

        return (MarqueeLabelWidget) super.getWidget();

    }



@Override

public MarqueeLabelState getState() {

        return (MarqueeLabelState) super.getState();

    }



    @Override

    public void onStateChanged(StateChangeEvent e) {

            super.onStateChanged(e);

            getWidget().setText(getState().text);

        }



    }

WidgetWidgetset.gwt.xml 位于 widgetpackage 包中：

<?xml version="1.0" encoding="UTF-8"?>

<!DOCTYPE module PUBLIC "-//Google Inc.//DTD Google Web Toolkit 1.7.0//EN" "http://google-web-toolkit.googlecode.com/svn/tags/1.7.0/distro-source/core/src/gwt-module.dtd">

<module>

    <inherits name="com.vaadin.DefaultWidgetSet" />

</module>

当我构建小部件集时 'Run on server' 一切正常，但是当我添加这个 ServerRpc 实现时，如下所示：

1）添加widgetpackage.MarqueeLabelServerRpc接口（widgetpackage，MarqueeLabel服务器组件所在）：

 public interface MarqueeLabelServerRpc extends ServerRpc {

      public void clicked();

    }

2) 将此行添加到 widgetpackage.client.MarqueeLabelConnector:

public class MarqueeLabelConnector extends AbstractComponentConnector {

  private MarqueeLabelServerRpc rpc = RpcProxy.create(
      MarqueeLabelServerRpc.class, this);

  public MarqueeLabelConnector() {
    getWidget().addClickHandler(new ClickHandler() {
      @Override
      public void onClick(ClickEvent event) {
        rpc.clicked(); // server's call
      }
    });
  }

  // ...

}

3) widgetpackage.MarqueeLabel 的构造函数： public class MarqueeLabel 扩展了 AbstractComponent {

  public MarqueeLabel() {
    registerRpc(new MarqueeLabelServerRpc() {
      @Override
      public void clicked() {
        Notification.show("Made a RPC”); 
      }
    });
  }

  // ...

}

如果我重新编译 widgetset 和运行项目，我会在浏览器中得到这个：

Widgetset 'widgetpackage.widgetWidgetset' does not contain implementation for 'widgetpackage.MarqueeLabel'. Check its component connector's @Connect mapping, widgetsets GWT module description file and re-compile your widgetset. In case you have downloaded a vaadin add-on package, you might want to refer to add-on instructions.

为什么当我添加 RPC 实现时，widgetset 找不到 MarqueeLabel 的实现？

Answer 1

我已经解决了，问题是 MarqueeLabelServerRpc 需要在 widgetpackage.client 包内而不是 widgetpackage 内。

ServerRpc 无法在自定义 Vaadin Widgetset 中工作，为什么我会收到“Widgetset '...' 不包含 '...' 的实现？

ServerRpc not working in a custom Vaadin Widgetset, why do I get "Widgetset '...' does not contain implementation for '...'?

gwt

rpc

widget

vaadin