Я использую vaadin springboot и получаю нулевой указатель при использовании autowire для EventBus.UIEventBus.
У меня уже есть компонент vaadinsessionscope в приложении Springboot. И я также могу создать EventBus.UIEventBus eventBus в основном классе пользовательского интерфейса.
Что я пытаюсь сделать в приведенном ниже коде, так это передать событие из loginview в мой основной класс пользовательского интерфейса vaadin. И получите нулевой указатель для EventBus.UIEventBus, который автоматически подключается.
Любой вклад приветствуется. Спасибо.
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>org.pk.connect2x</groupId>
<artifactId>connect2x</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>war</packaging>
<name>connect2x</name>
<description>get data from any source to any destination.</description>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>1.2.5.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<properties>
<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
<java.version>1.8</java.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-spring-boot-starter</artifactId>
<version>1.0.0.beta3</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-tomcat</artifactId>
<version>1.2.4.RELEASE</version>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>org.vaadin.spring</groupId>
<artifactId>spring-vaadin-eventbus</artifactId>
<version>0.0.5.RELEASE</version>
</dependency>
<dependency>
<groupId>org.atmosphere</groupId>
<artifactId>atmosphere-runtime</artifactId>
<version>2.4.0-RC1</version>
</dependency>
</dependencies>
<dependencyManagement>
<dependencies>
<dependency>
<groupId>com.vaadin</groupId>
<artifactId>vaadin-bom</artifactId>
<version>7.4.5</version>
<type>pom</type>
<scope>import</scope>
</dependency>
</dependencies>
</dependencyManagement>
<build>
<plugins>
<plugin>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
Ниже приведен класс приложения Springboot.
package connect2x;
import com.vaadin.spring.internal.VaadinSessionScope;
import org.atmosphere.cpr.SessionSupport;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.embedded.EmbeddedServletContainerFactory;
import org.springframework.boot.context.embedded.tomcat.TomcatEmbeddedServletContainerFactory;
import org.springframework.context.annotation.Bean;
import org.vaadin.spring.events.EventBus;
import org.vaadin.spring.events.annotation.EnableVaadinEventBus;
import org.vaadin.spring.events.support.ApplicationContextEventBroker;
@SpringBootApplication
@EnableVaadinEventBus
public class Connect2xApplication {
@Autowired
EventBus.ApplicationEventBus applicationEventBus;
@Bean
ApplicationContextEventBroker applicationContextEventBroker() {
return new ApplicationContextEventBroker(applicationEventBus);
}
@Bean
public SessionSupport atmosphereSessionSupport() {
return new SessionSupport();
}
@Bean
static VaadinSessionScope vaadinSessionScope() {
return new VaadinSessionScope();
}
@Bean
public EmbeddedServletContainerFactory servletContainer() {
TomcatEmbeddedServletContainerFactory factory = new TomcatEmbeddedServletContainerFactory();
return factory;
}
public static void main(String[] args) {
SpringApplication.run(Connect2xApplication.class, args);
}
}
Ниже представлен основной класс пользовательского интерфейса, в котором нет нулевого указателя для шины событий.
package connect2x;
import com.vaadin.annotations.Theme;
import com.vaadin.server.Responsive;
import com.vaadin.server.VaadinRequest;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.ui.UI;
import com.vaadin.ui.themes.ValoTheme;
import connect2x.com.pk.connect2x.view.Login;
import connect2x.com.pk.connect2x.view.MainView;
import org.springframework.beans.factory.annotation.Autowired;
import org.vaadin.spring.events.EventBus;
import org.vaadin.spring.events.EventBusListener;
import java.util.Locale;
/**
* Created by karthikmarupeddi on 7/18/15.
*/
@SpringUI
@Theme("valo")
public class Connect2xUI extends UI implements EventBusListener<Object> {
@Autowired
EventBus.UIEventBus eventBus;
@Autowired
Login login;
@Override
protected void init(VaadinRequest vaadinRequest) {
setLocale(Locale.US);
Responsive.makeResponsive(this);
addStyleName(ValoTheme.UI_WITH_MENU);
updateContent();
}
/**
* Updates the correct content for this UI based on the current user status.
* If the user is logged in with appropriate privileges, main view is shown.
* Otherwise login view is shown.
*/
private void updateContent() {
// User user = (User) VaadinSession.getCurrent().getAttribute(
// User.class.getName());
// if (user != null && "admin".equals(user.getRole())) {
// // Authenticated user
// setContent(new MainView());
// removeStyleName("loginview");
// getNavigator().navigateTo(getNavigator().getState());
// } else {
// //setContent(loginView);
// setContent(new MainView());
// addStyleName("loginview");
// }
setContent(login);
addStyleName("loginview");
}
/**
* Called when an event has been received.
*
* @param event the event, never {@code null}.
*/
@Override
public void onEvent(org.vaadin.spring.events.Event<Object> event) {
System.out.println("****************printing data***************" );
setContent(new MainView());
removeStyleName("loginview");
getNavigator().navigateTo(getNavigator().getState());
}
}
Логин - это класс Java, в котором я получаю нулевой указатель для шины событий.
package connect2x.com.pk.connect2x.view;
import com.vaadin.event.ShortcutAction;
import com.vaadin.server.FontAwesome;
import com.vaadin.server.Responsive;
import com.vaadin.spring.annotation.SpringComponent;
import com.vaadin.spring.annotation.UIScope;
import com.vaadin.ui.*;
import com.vaadin.ui.themes.ValoTheme;
import org.springframework.beans.factory.annotation.Autowired;
import org.vaadin.spring.events.EventBus;
import org.vaadin.spring.events.EventBusListener;
/**
* Created by karthikmarupeddi on 7/18/15.
*/
@UIScope
@SpringComponent
public class Login extends VerticalLayout implements EventBusListener<Object> {
@Autowired
EventBus.UIEventBus eventBus;
public Login() {
eventBus.subscribe(this);
setSizeFull();
Component loginForm = buildLoginForm();
addComponent(loginForm);
setComponentAlignment(loginForm, Alignment.MIDDLE_CENTER);
}
private Component buildLoginForm() {
final VerticalLayout loginPanel = new VerticalLayout();
loginPanel.setSizeUndefined();
loginPanel.setSpacing(true);
Responsive.makeResponsive(loginPanel);
loginPanel.addStyleName("login-panel");
loginPanel.addComponent(buildLabels());
loginPanel.addComponent(buildFields());
loginPanel.addComponent(new CheckBox("Remember me", true));
return loginPanel;
}
private Component buildLabels() {
CssLayout labels = new CssLayout();
labels.addStyleName("labels");
Label welcome = new Label("Welcome");
welcome.setSizeUndefined();
welcome.addStyleName(ValoTheme.LABEL_H4);
welcome.addStyleName(ValoTheme.LABEL_COLORED);
labels.addComponent(welcome);
Label title = new Label("Connect2X");
title.setSizeUndefined();
title.addStyleName(ValoTheme.LABEL_H3);
title.addStyleName(ValoTheme.LABEL_LIGHT);
labels.addComponent(title);
return labels;
}
private Component buildFields() {
HorizontalLayout fields = new HorizontalLayout();
fields.setSpacing(true);
fields.addStyleName("fields");
final TextField username = new TextField("Username");
username.setIcon(FontAwesome.USER);
username.addStyleName(ValoTheme.TEXTFIELD_INLINE_ICON);
final PasswordField password = new PasswordField("Password");
password.setIcon(FontAwesome.LOCK);
password.addStyleName(ValoTheme.TEXTFIELD_INLINE_ICON);
final Button signin = new Button("Sign In");
signin.addStyleName(ValoTheme.BUTTON_PRIMARY);
signin.setClickShortcut(ShortcutAction.KeyCode.ENTER);
signin.focus();
fields.addComponents(username, password, signin);
fields.setComponentAlignment(signin, Alignment.BOTTOM_LEFT);
signin.addClickListener(new Button.ClickListener() {
@Override
public void buttonClick(final Button.ClickEvent event) {
System.out.println("*************click listener **************");
eventBus.publish(Login.this, "Hello World from UI");
removeStyleName("loginview");
}
});
return fields;
}
/**
* Called when an event has been received.
*
* @param event the event, never {@code null}.
*/
@Override
public void onEvent(org.vaadin.spring.events.Event<Object> event) {
System.out.println("*************click listener **************");
}
}
eventBus? - person tankucukoglu schedule 22.07.2015