Vaadinの紹介

<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-server</artifactId>
</dependency>
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-client-compiled</artifactId>
</dependency>
<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-themes</artifactId>
</dependency>

<repositories>
    <repository>
        <id>vaadin-addons</id>
        <url>http://maven.vaadin.com/vaadin-addons</url>
    </repository>
</repositories>
<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-bom</artifactId>
            <version>8.0.7</version>
            <type>pom</type>
            <scope>import</scope>
        </dependency>
    </dependencies>
</dependencyManagement>

<plugin>
    <groupId>org.eclipse.jetty</groupId>
    <artifactId>jetty-maven-plugin</artifactId>
    <version>9.2.22.v20170606</version>
    <configuration>
        <scanIntervalSeconds>2</scanIntervalSeconds>
        <skipTests>true</skipTests>
    </configuration>
</plugin>

mvn jetty:run

@WebServlet(urlPatterns = "/** ", name = "MyUIServlet", asyncSupported = true)
@VaadinServletConfiguration(ui = VaadinUI.class, productionMode = false)
public static class MyUIServlet extends VaadinServlet {}

public class VaadinUI extends UI {

    @Override
    protected void init(VaadinRequest vaadinRequest) {
        VerticalLayout verticalLayout = new VerticalLayout();
        verticalLayout.setSpacing(true);
        verticalLayout.setMargin(true);
        setContent(verticalLayout);
}

<dependency>
    <groupId>com.vaadin</groupId>
    <artifactId>vaadin-push</artifactId>
    <versionId>8.0.7</versionId>
</dependency>

@Push
@Theme("mytheme")
public class VaadinUI extends UI {...}

private Label currentTime;

ScheduledExecutorService scheduleExecutor = Executors.newScheduledThreadPool(1);
Runnable task = () -> {
    currentTime.setValue("Current Time : " + Instant.now());
};
scheduleExecutor.scheduleWithFixedDelay(task, 0, 1, TimeUnit.SECONDS);

public class BindData {

    private String bindName;

    public BindData(String bindName){
        this.bindName = bindName;
    }

   //getter & setter
}

BindData bindData = new BindData("BindData");
BeanFieldGroup beanFieldGroup = new BeanFieldGroup(BindData.class);
beanFieldGroup.setItemDataSource(bindData);
TextField bindedTextField
  = (TextField) beanFieldGroup.buildAndBind("BindName", "bindName");

TextField stringValidator = new TextField();
stringValidator.addValidator(
  new StringLengthValidator("String must have 2-5 characters lenght", 2, 5, true));
stringValidator.setValidationVisible(false);

Button buttonStringValidator = new Button("Validate String");
buttonStringValidator.addClickListener(e -> {
    try {
        stringValidator.setValidationVisible(false);
        stringValidator.validate();
    } catch (InvalidValueException err) {
        stringValidator.setValidationVisible(true);
    }
});