VaadinUIComponent with pure Spring Boot applications

Flow
1

Hi all,

I’m trying to embed Vaadin UI from a Spring Boot Application into another Vaadin Spring Boot Application.
I found Alejandro Duartes add-on VaadinUIComponent, which seems to make this case simple.
I used his example for the add-on and modified it for Spring Boot.
But unfortunately I don’t get it running. At the moment the primary problem is, that I always get the message “This application requires cookies to function. Please enable cookies …”
I looked around in web tried different thinks but didn’t get it running.
At the moment I’m a little bit lost.
So, any help would be appreciate.

As already mentioned the Example is based on Alejandros example and I made it as simple as possible.
There are two applications Embedded 1 and Embedded 2, which are identical. They only output a different label text for identification.
EmbeddedUI1.java looks like following:

[code]
package org.test;

import com.vaadin.annotations.Theme;
import com.vaadin.server.VaadinRequest;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.ui.Button;
import com.vaadin.ui.Label;
import com.vaadin.ui.TextField;
import com.vaadin.ui.UI;
import com.vaadin.ui.VerticalLayout;

@SuppressWarnings({ “serial” })
@SpringUI
@Theme(“valo”)
public class EmbeddedUI1 extends UI
{

@Override
protected void init(VaadinRequest request)
{
    final VerticalLayout layout = new VerticalLayout();

    final Label app = new Label("This is Embedded 1");
    
    final TextField name = new TextField();
    name.setCaption("Type your name here:");

    Button button = new Button("Click Me");
    button.addClickListener(e ->
    {
        layout.addComponent(new Label("Thanks " + name.getValue() + ", it works!"));
    });

    layout.addComponents(app, name, button);
    layout.setMargin(true);
    layout.setSpacing(true);

    setContent(layout);
}

}
[/code]EmbeddedUI2.java looks the same with the only exception that the label text is “This is Embedded 2” instead of “This is Embedded 1”.

Application.java is the following:

[code]
package org.test;

import javax.servlet.annotation.WebFilter;
import javax.servlet.annotation.WebInitParam;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.web.servlet.ServletContextInitializer;
import org.springframework.context.annotation.Bean;

import com.thetransactioncompany.cors.CORSFilter;
import com.vaadin.spring.annotation.SpringComponent;

@SpringBootApplication
public class Application
{

public static void main(String args)
{
    SpringApplication.run(Application.class, args);
}

@SpringComponent
@WebFilter(urlPatterns = "/*", initParams = @WebInitParam(name = "cors.allowOrigin", value = "*"))
public static class EmbeddedUICorsFilter extends CORSFilter
{
        
}

@Bean
public ServletContextInitializer sessionCookieConfigListener()
{
    return context -> context.getSessionCookieConfig().setName("bootapp-session-id");
}

}
[/code]So, Application.java is the same for Embedded 1 and 2.

application.properties for Embedded 1 is:

spring.application.name=embedded-ui-1 server.port=800 And application.properties for Embedded 2 is:

spring.application.name=embedded-ui-2 server.port=8002 The Maven POM is:

[code]

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


4.0.0

<groupId>org.test</groupId>
<artifactId>embedded1</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>embedded-ui-1</name>
<description>Demo embedded project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>1.5.6.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</properties>

<repositories>
    <repository>
        <id>vaadin-addons</id>
        <url>http://maven.vaadin.com/vaadin-addons</url>
    </repository>
</repositories>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-devtools</artifactId>
    </dependency>
    <dependency>
        <groupId>com.vaadin</groupId>
        <artifactId>vaadin-spring-boot-starter</artifactId>
    </dependency>

    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
    <dependency>
        <groupId>com.thetransactioncompany</groupId>
        <artifactId>cors-filter</artifactId>
        <version>2.6</version>
    </dependency>
</dependencies>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-bom</artifactId>
            <version>8.1.1</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>
[/code]The POM for both Embedded UI application is identical except for .

The Host application UI (HostUI.java) is the following:

[code]
package org.test;

import com.vaadin.annotations.Theme;
import org.vaadin.embedded.VaadinUIComponent;
import com.vaadin.server.VaadinRequest;
import com.vaadin.spring.annotation.SpringUI;
import com.vaadin.ui.HorizontalSplitPanel;
import com.vaadin.ui.UI;
import com.vaadin.ui.themes.ValoTheme;

@SuppressWarnings(“serial”)
@SpringUI
@Theme(ValoTheme.THEME_NAME)
public class HostUI extends UI
{
@Override
protected void init(VaadinRequest request)
{
VaadinUIComponent ui1 = new VaadinUIComponent(“http://localhost:8001”);
ui1.setSizeFull();
VaadinUIComponent ui2 = new VaadinUIComponent(“http://localhost:8002”);

    HorizontalSplitPanel split = new HorizontalSplitPanel(ui1, ui2);
    split.setSizeFull();
    setContent(split);
}

}
[/code]And the Application.java for the host application is:

[code]
package org.test;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

@SpringBootApplication
public class Application
{

public static void main(String args)
{
    SpringApplication.run(Application.class, args);

}

}
[/code]application.properties is:

spring.application.name=host-ui server.port=8080 and POM is:

<?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.test</groupId>
    <artifactId>host</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>host-ui</name>
    <description>Demo embedded project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.6.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>

    <properties>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
        <java.version>1.8</java.version>
    </properties>

    <repositories>
        <repository>
            <id>vaadin-addons</id>
            <url>http://maven.vaadin.com/vaadin-addons</url>
        </repository>
    </repositories>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
        </dependency>
        <dependency>
            <groupId>com.vaadin</groupId>
            <artifactId>vaadin-spring-boot-starter</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
        <dependency>
            <groupId>org.vaadin.embedded</groupId>
            <artifactId>embedded-ui</artifactId>
            <version>2.1</version>
        </dependency>
    </dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>com.vaadin</groupId>
                <artifactId>vaadin-bom</artifactId>
                <version>8.1.1</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>

I’m running everything in the STS Editor 3.9.

I attached a ZIP file with all the sources in.

Even everything is simple it seems I’m missing something to get it running. Any Help?

34701.zip (12.1 KB)