Hi there!
I was following the step-by-step video tutorial and although it compiled and runned with no apearent errors I got my tabsheet with no tab captions and no tab buttons as you can see:
I went through a lot of search and found nothing about this… so I found that it was something wrong with the client side and got the GWT dev-mode to help. The app found a null pointer exception:
00:08:59,621 [ERROR]
Mon Feb 03 01:28:32 BRST 2014 com.vaadin.client.VConsole
SEVERE:
java.lang.NullPointerException: null at com.vaadin.client.ui.VTabsheet.isClipped(VTabsheet.java:1031) at com.vaadin.client.ui.VTabsheet.updateTabScroller(VTabsheet.java:982) at com.vaadin.client.ui.VTabsheet.iLayout(VTabsheet.java:917) at com.vaadin.client.ui.VTabsheet.renderContent(VTabsheet.java:894) at com.vaadin.client.ui.VTabsheet.renderTab(VTabsheet.java:844) at com.vaadin.client.ui.tabsheet.TabsheetBaseConnector.updateFromUIDL(TabsheetBaseConnector.java:75) at com.vaadin.client.ui.tabsheet.TabsheetConnector.updateFromUIDL(TabsheetConnector.java:47) at com.vaadin.client.ApplicationConnection$8.updateVaadin6StyleConnectors(ApplicationConnection.java:1860) at com.vaadin.client.ApplicationConnection$8.execute(ApplicationConnection.java:1473) at com.vaadin.client.ApplicationConfiguration.runWhenDependenciesLoaded(ApplicationConfiguration.java:535) at com.vaadin.client.ApplicationConnection.handleUIDLMessage(ApplicationConnection.java:2331) at com.vaadin.client.ApplicationConnection.handleReceivedJSONMessage(ApplicationConnection.java:1294) at com.vaadin.client.ApplicationConnection.handleWhenCSSLoaded(ApplicationConnection.java:1048) at com.vaadin.client.ApplicationConnection.handleJSONText(ApplicationConnection.java:943) at com.vaadin.client.ApplicationConnection.start(ApplicationConnection.java:542) at com.vaadin.client.ApplicationConfiguration$1.execute(ApplicationConfiguration.java:427) at com.google.gwt.core.client.impl.SchedulerImpl$Task$.executeScheduled$(SchedulerImpl.java:50) at com.google.gwt.core.client.impl.SchedulerImpl.runScheduledTasks(SchedulerImpl.java:180) at com.google.gwt.core.client.impl.SchedulerImpl.flushPostEventPumpCommands(SchedulerImpl.java:346) at com.google.gwt.core.client.impl.SchedulerImpl$Flusher.execute(SchedulerImpl.java:78) at com.google.gwt.core.client.impl.SchedulerImpl.execute(SchedulerImpl.java:138) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103) at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71) at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172) at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessagesWhileWaitingForReturn(BrowserChannelServer.java:338) at com.google.gwt.dev.shell.BrowserChannelServer.invokeJavascript(BrowserChannelServer.java:219) at com.google.gwt.dev.shell.ModuleSpaceOOPHM.doInvoke(ModuleSpaceOOPHM.java:136) at com.google.gwt.dev.shell.ModuleSpace.invokeNative(ModuleSpace.java:571) at com.google.gwt.dev.shell.ModuleSpace.invokeNativeObject(ModuleSpace.java:279) at com.google.gwt.dev.shell.JavaScriptHost.invokeNativeObject(JavaScriptHost.java:91) at com.google.gwt.core.client.impl.Impl.apply(Impl.java) at com.google.gwt.core.client.impl.Impl.entry0(Impl.java:324) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) at java.lang.reflect.Method.invoke(Unknown Source) at com.google.gwt.dev.shell.MethodAdaptor.invoke(MethodAdaptor.java:103) at com.google.gwt.dev.shell.MethodDispatch.invoke(MethodDispatch.java:71) at com.google.gwt.dev.shell.OophmSessionHandler.invoke(OophmSessionHandler.java:172) at com.google.gwt.dev.shell.BrowserChannelServer.reactToMessages(BrowserChannelServer.java:293) at com.google.gwt.dev.shell.BrowserChannelServer.processConnection(BrowserChannelServer.java:547) at com.google.gwt.dev.shell.BrowserChannelServer.run(BrowserChannelServer.java:364) at java.lang.Thread.run(Unknown Source)The code of the component was generated using the visual editor:
package com.example.vaadinintro;
import com.vaadin.annotations.AutoGenerated;
import com.vaadin.data.util.TextFileProperty;
import com.vaadin.ui.AbsoluteLayout;
import com.vaadin.ui.CustomComponent;
import com.vaadin.ui.RichTextArea;
import com.vaadin.ui.TabSheet;
import com.vaadin.ui.TextArea;
public class DocEditor extends CustomComponent {
/*- VaadinEditorProperties={"grid":"RegularGrid,20","showGrid":true,"snapToGrid":true,"snapToObject":true,"movingGuides":false,"snappingDistance":10} */
@AutoGenerated
private AbsoluteLayout mainLayout;
@AutoGenerated
private TabSheet tabSheet_1;
@AutoGenerated
private TextArea textArea_1;
@AutoGenerated
private RichTextArea richTextArea_1;
/**
* The constructor should first build the main layout, set the
* composition root and then do any custom initialization.
*
* The constructor will not be automatically regenerated by the
* visual editor.
*/
public DocEditor() {
buildMainLayout();
setCompositionRoot(mainLayout);
// TODO add user code here
}
public void setPropertyDataSource(TextFileProperty textFileProperty) {
richTextArea_1.setPropertyDataSource(textFileProperty);
textArea_1.setPropertyDataSource(textFileProperty);
}
@AutoGenerated
private AbsoluteLayout buildMainLayout() {
// common part: create layout
mainLayout = new AbsoluteLayout();
mainLayout.setImmediate(false);
mainLayout.setWidth("100%");
mainLayout.setHeight("100%");
// top-level component properties
setWidth("100.0%");
setHeight("100.0%");
// tabSheet_1
tabSheet_1 = buildTabSheet_1();
mainLayout.addComponent(tabSheet_1, "top:20.0px;right:20.0px;bottom:20.0px;left:20.0px;");
return mainLayout;
}
@AutoGenerated
private TabSheet buildTabSheet_1() {
// common part: create layout
tabSheet_1 = new TabSheet();
tabSheet_1.setImmediate(true);
tabSheet_1.setWidth("100.0%");
tabSheet_1.setHeight("100.0%");
// richTextArea_1
richTextArea_1 = new RichTextArea();
richTextArea_1.setImmediate(false);
richTextArea_1.setWidth("100.0%");
richTextArea_1.setHeight("100.0%");
tabSheet_1.addTab(richTextArea_1, "Wysiwyg", null);
// textArea_1
textArea_1 = new TextArea();
textArea_1.setImmediate(false);
textArea_1.setWidth("100.0%");
textArea_1.setHeight("100.0%");
tabSheet_1.addTab(textArea_1, "HTML", null);
return tabSheet_1;
}
}
And finally the main file which was written manually:
package com.example.vaadinintro;
import java.io.File;
import javax.servlet.annotation.WebServlet;
import com.vaadin.annotations.Theme;
import com.vaadin.annotations.VaadinServletConfiguration;
import com.vaadin.data.Property.ValueChangeEvent;
import com.vaadin.data.Property.ValueChangeListener;
import com.vaadin.data.util.FilesystemContainer;
import com.vaadin.data.util.TextFileProperty;
import com.vaadin.server.VaadinRequest;
import com.vaadin.server.VaadinServlet;
import com.vaadin.ui.HorizontalSplitPanel;
import com.vaadin.ui.Table;
import com.vaadin.ui.UI;
@SuppressWarnings("serial")
@Theme("vaadinintro")
public class VaadinintroUI extends UI {
FilesystemContainer docs = new FilesystemContainer(new File("/tmp/"));
Table box = new Table("Documents", docs);
DocEditor docView = new DocEditor();
@WebServlet(value = "/*", asyncSupported = true)
@VaadinServletConfiguration(productionMode = false, ui = VaadinintroUI.class)
public static class Servlet extends VaadinServlet {
}
@Override
protected void init(VaadinRequest request) {
HorizontalSplitPanel split = new HorizontalSplitPanel();
setContent(split);
split.addComponent(box);
split.addComponent(docView);
box.setSizeFull();
box.addValueChangeListener(new ValueChangeListener(){
@Override
public void valueChange(ValueChangeEvent event) {
docView.setPropertyDataSource(new TextFileProperty((File) event.getProperty().getValue()));
}
});
box.setImmediate(true);
box.setSelectable(true);
}
}