GWT错误 - 无法使用DocLayoutPanel在浏览器中查看输出

Question

我正在使用DocLayout Panel编写应用程序。问题是我可以在GWT设计器中看到结果，但是当我尝试运行应用程序时，没有出现相同的输出。任何人都可以告诉我为什么会这样。

我的代码如下：

package com.ibm.projects.quest.qwt.gui;

import com.google.gwt.core.client.GWT;

public class ApplicationDefaultWindow extends DockLayoutPanel {
    private FooterPanel footerPanel = null;
    private HeaderPanel headerPanel = null;
    private LeftNavigation leftNavigation = null;
    private RightNavigation rightNavigation = null;
    private ContentPanel centerPanel = null;

    public FooterPanel getFooterPanel() {
        return footerPanel;
    }

    public void setFooterPanel(FooterPanel footerPanel) {
        this.footerPanel = footerPanel;
    }

    public HeaderPanel getHeaderPanel() {
        return headerPanel;
    }

    public void setHeaderPanel(HeaderPanel headerPanel) {
        this.headerPanel = headerPanel;
    }

    public LeftNavigation getLeftNavigation() {
        return leftNavigation;
    }

    public void setLeftNavigation(LeftNavigation leftNavigation) {
        this.leftNavigation = leftNavigation;
    }

    public RightNavigation getRightNavigation() {
        return rightNavigation;
    }

    public void setRightNavigation(RightNavigation rightNavigation) {
        this.rightNavigation = rightNavigation;
    }

    public ContentPanel getCenterPanel() {
        return centerPanel;
    }

    public void setCenterPanel(ContentPanel centerPanel) {
        this.centerPanel = centerPanel;
    }

    public ApplicationDefaultWindow() {
        // TODO Auto-generated constructor stub
        super(Unit.EM);
        headerPanel= new HeaderPanel();
        this.addNorth(headerPanel, 7.1);        
        leftNavigation = new LeftNavigation();
        this.addWest(leftNavigation,12.0);
        rightNavigation = new RightNavigation();
        this.addEast(rightNavigation, 9.0);
        footerPanel = new FooterPanel();
        this.addSouth(footerPanel, 3.5);
        centerPanel = new ContentPanel();
        this.add(centerPanel);
    }
}

Answer 1

非常感谢莱利为你提示。

现在我改变了

RootPanel.get().add() --> RootLayoutPanel.get().add() 

问题解决了。