Can anyone tell me, what's I missed?

Vaadin 6 / 7 / 8
1

I want to try Vaadin as I interested and download from v8-full-stack-spring because I familiar with Spring framework.
The download page has said after you download, just follow the README and everthing will work fine, but I found it’s not.

Here what’s I found when run mvn spring-boot:run

C:\sandbox\my_starter_project>mvn spring-boot:run
[INFO]
 Scanning for projects...
[INFO]

[INFO]
 -----------------< com.gmail.natta:my_starter_project >-----------------
[INFO]
 Building My Starter Project 1.0-SNAPSHOT
[INFO]
 --------------------------------[ war ]
---------------------------------
[INFO]

[INFO]
 >>> spring-boot-maven-plugin:1.5.4.RELEASE:run (default-cli) > test-compile @ my_starter_project >>>
[INFO]

[INFO]
 --- maven-enforcer-plugin:1.4:enforce (enforce-no-snapshots) @ my_starter_project ---
[INFO]

[INFO]
 --- vaadin-maven-plugin:8.1.5:update-theme (default) @ my_starter_project ---
[INFO]
 Updating theme VAADIN\themes\apptheme
[ERROR]
 Error: Could not find or load main class com.vaadin.server.themeutils.SASSAddonImportFileCreator
[ERROR]
 Caused by: java.lang.ClassNotFoundException: com.vaadin.server.themeutils.SASSAddonImportFileCreator
[ERROR]
 Updating theme "VAADIN\themes\apptheme" failed
org.codehaus.mojo.gwt.shell.JavaCommandException: Command [[
C:\Program Files\Java\jdk-9\bin\java -Xmx2G com.vaadin.server.themeutils.SASSAddonImportFileCreator C:\sandbox\my_starter_project\src\main\webapp\VAADIN\themes\apptheme
]] failed with status 1
    at org.codehaus.mojo.gwt.shell.JavaCommand.execute (JavaCommand.java:330)
    at com.vaadin.integration.maven.UpdateThemeMojo.processTheme (UpdateThemeMojo.java:45)
    at com.vaadin.integration.maven.AbstractThemeMojo.doExecute (AbstractThemeMojo.java:43)
    at org.codehaus.mojo.gwt.shell.AbstractGwtShellMojo.execute (AbstractGwtShellMojo.java:182)
    at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:137)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:208)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
    at org.apache.maven.lifecycle.internal.MojoExecutor.executeForkedExecutions (MojoExecutor.java:353)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:198)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:154)
    at org.apache.maven.lifecycle.internal.MojoExecutor.execute (MojoExecutor.java:146)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:117)
    at org.apache.maven.lifecycle.internal.LifecycleModuleBuilder.buildProject (LifecycleModuleBuilder.java:81)
    at org.apache.maven.lifecycle.internal.builder.singlethreaded.SingleThreadedBuilder.build (SingleThreadedBuilder.java:56)
    at org.apache.maven.lifecycle.internal.LifecycleStarter.execute (LifecycleStarter.java:128)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:305)
    at org.apache.maven.DefaultMaven.doExecute (DefaultMaven.java:192)
    at org.apache.maven.DefaultMaven.execute (DefaultMaven.java:105)
    at org.apache.maven.cli.MavenCli.execute (MavenCli.java:956)
    at org.apache.maven.cli.MavenCli.doMain (MavenCli.java:290)
    at org.apache.maven.cli.MavenCli.main (MavenCli.java:194)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0 (Native Method)
    at jdk.internal.reflect.NativeMethodAccessorImpl.invoke (NativeMethodAccessorImpl.java:62)
    at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke (DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke (Method.java:564)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launchEnhanced (Launcher.java:289)
    at org.codehaus.plexus.classworlds.launcher.Launcher.launch (Launcher.java:229)
    at org.codehaus.plexus.classworlds.launcher.Launcher.mainWithExitCode (Launcher.java:415)
    at org.codehaus.plexus.classworlds.launcher.Launcher.main (Launcher.java:356)
[INFO]
 ------------------------------------------------------------------------
[INFO]
 BUILD FAILURE
[INFO]
 ------------------------------------------------------------------------
[INFO]
 Total time: 11.413 s
[INFO]
 Finished at: 2018-05-01T11:51:12+09:00
[INFO]
 ------------------------------------------------------------------------
[ERROR]
 Failed to execute goal com.vaadin:vaadin-maven-plugin:8.1.5:update-theme (default) on project my_starter_project: Updating theme "VAADIN\themes\apptheme" failed: Command [[
[ERROR]
 C:\Program Files\Java\jdk-9\bin\java -Xmx2G com.vaadin.server.themeutils.SASSAddonImportFileCreator C:\sandbox\my_starter_project\src\main\webapp\VAADIN\themes\apptheme
[ERROR]
 ]] failed with status 1
[ERROR]
 -> [Help 1]

[ERROR]

[ERROR]
 To see the full stack trace of the errors, re-run Maven with the -e switch.
[ERROR]
 Re-run Maven using the -X switch to enable full debug logging.
[ERROR]

[ERROR]
 For more information about the errors and possible solutions, please read the following articles:
[ERROR]
 [Help 1]
 http://cwiki.apache.org/confluence/display/MAVEN/MojoExecutionException

And here is what’s defined in pom.xml

<?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>com.gmail.natta</groupId>
	<artifactId>my_starter_project</artifactId>
	<version>1.0-SNAPSHOT</version>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>1.5.4.RELEASE</version>
		<relativePath></relativePath>
	</parent>

	<packaging>war</packaging>
	<name>My Starter Project</name>

	<properties>
		<vaadin.version>8.1.5</vaadin.version>
		<vaadin-spring.version>2.1.0.beta2</vaadin-spring.version>
		<vaadin.plugin.version>${vaadin.version}</vaadin.plugin.version>
		<org.vaadin.spring.version>0.0.7.RELEASE</org.vaadin.spring.version>

		<maven.compiler.source>1.8</maven.compiler.source>
		<maven.compiler.target>1.8</maven.compiler.target>
		<vaadin.widgetset.mode>fetch</vaadin.widgetset.mode>

		<!-- Overrides for Spring Boot dependencies -->
		<selenium.version>3.4.0</selenium.version>
		<selenium-htmlunit.version>2.26</selenium-htmlunit.version>
	</properties>

	<repositories>
		<repository>
			<id>vaadin-addons</id>
			<url>http://maven.vaadin.com/vaadin-addons</url>
		</repository>
		<repository>
			<id>vaadin-pre</id>
			<url>http://maven.vaadin.com/vaadin-prereleases</url>
		</repository>
		<repository>
			<id>vaadin-snapshot</id>
			<url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
		</repository>
        <repository>
            <id>maven2</id>
            <url>https://repo.maven.apache.org/maven2/</url>
        </repository>
	</repositories>

	<pluginRepositories>
		<pluginRepository>
			<id>vaadin-pre</id>
			<url>http://maven.vaadin.com/vaadin-prereleases</url>
		</pluginRepository>
		<pluginRepository>
			<id>vaadin-snapshot</id>
			<url>https://oss.sonatype.org/content/repositories/vaadin-snapshots/</url>
		</pluginRepository>
	</pluginRepositories>

	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>com.vaadin</groupId>
				<artifactId>vaadin-bom</artifactId>
				<version>${vaadin.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>

	<dependencies>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-server</artifactId>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-push</artifactId>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-client-compiled</artifactId>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-themes</artifactId>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-spring-boot-starter</artifactId>
			<version>${vaadin-spring.version}</version><!--$NO-MVN-MAN-VER$ -->
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-spring-boot</artifactId>
			<version>${vaadin-spring.version}</version><!--$NO-MVN-MAN-VER$ -->
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-spring</artifactId>
			<version>${vaadin-spring.version}</version><!--$NO-MVN-MAN-VER$ -->
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-spring-security</artifactId>
			<version>${vaadin-spring.version}</version>
		</dependency>
		<dependency>
			<groupId>org.vaadin.addon</groupId>
			<artifactId>confirmdialog</artifactId>
			<version>3.1.2</version>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-devtools</artifactId>
			<optional>true</optional>
		</dependency>

		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-charts</artifactId>
			<version>4.0.0</version>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-board</artifactId>
			<version>1.0.1</version>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-board-precompiled</artifactId>
			<version>1.0.1</version>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>webcomponents-helper</artifactId>
			<version>0.2.0</version>
		</dependency>

		<!-- Spring -->
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-data-jpa</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.security</groupId>
			<artifactId>spring-security-config</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
		<dependency>
			<groupId>org.vaadin.spring.addons</groupId>
			<artifactId>vaadin-spring-addon-eventbus</artifactId>
			<version>${org.vaadin.spring.version}</version>
		</dependency>
		<dependency>
			<groupId>com.h2database</groupId>
			<artifactId>h2</artifactId>
		</dependency>

		<!-- Testing -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
		</dependency>
		<dependency>
			<groupId>org.hamcrest</groupId>
			<artifactId>hamcrest-library</artifactId>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-testbench-api</artifactId>
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>com.vaadin</groupId>
			<artifactId>vaadin-testbench-core</artifactId>
			<version>5.1.0</version><!--$NO-MVN-MAN-VER$ -->
			<scope>test</scope>
		</dependency>
		<dependency>
			<groupId>org.vaadin.artur</groupId>
			<artifactId>spring-data-provider</artifactId>
			<version>1.0.0</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<plugin>
				<groupId>com.vaadin</groupId>
				<artifactId>vaadin-maven-plugin</artifactId>
				<version>${vaadin.plugin.version}</version>
				<dependencies>
					<!-- For Travis -->
					<dependency>
						<groupId>xml-apis</groupId>
						<artifactId>xml-apis</artifactId>
						<version>1.4.01</version>
					</dependency>
				</dependencies>
				<configuration>
					<extraJvmArgs>-Xmx2G</extraJvmArgs>
				</configuration>
				<executions>
					<execution>
						<goals>
							<goal>update-theme</goal>
							<goal>update-widgetset</goal>
							<goal>compile</goal>
							<goal>compile-theme</goal>
						</goals>
					</execution>
				</executions>
			</plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-enforcer-plugin</artifactId>
				<executions>
					<execution>
						<id>enforce-no-snapshots</id>
						<goals>
							<goal>enforce</goal>
						</goals>
						<configuration>
							<rules>
								<requireReleaseDeps>
									<message>No Snapshots Allowed!</message>
								</requireReleaseDeps>
							</rules>
							<fail>true</fail>
						</configuration>
					</execution>
				</executions>
			</plugin>
		</plugins>
	</build>

	<profiles>
		<profile>
			<!-- For running TestBench tests -->
			<id>it</id>
			<activation>
				<property>
					<name>it</name>
				</property>
			</activation>
			<build>
				<plugins>
					<plugin>
						<groupId>org.springframework.boot</groupId>
						<artifactId>spring-boot-maven-plugin</artifactId>
						<executions>
							<execution>
								<id>pre-integration-test</id>
								<goals>
									<goal>start</goal>
								</goals>
							</execution>
							<execution>
								<id>post-integration-test</id>
								<goals>
									<goal>stop</goal>
								</goals>
							</execution>
						</executions>
						<configuration>
							<maxAttempts>120</maxAttempts>
						</configuration>
					</plugin>

					<plugin>
						<artifactId>maven-failsafe-plugin</artifactId>
						<version>2.19.1</version>
						<executions>
							<execution>
								<goals>
									<goal>integration-test</goal>
									<goal>verify</goal>
								</goals>
							</execution>
						</executions>
						<configuration>
							<trimStackTrace>false</trimStackTrace>
							<systemPropertyVariables>
								<webdriver.chrome.driver>${webdriver.chrome.driver}</webdriver.chrome.driver>
							</systemPropertyVariables>
						</configuration>
					</plugin>

					<!-- Plugin for automatically download Chrome Driver for tests -->
					<plugin>
						<groupId>com.lazerycode.selenium</groupId>
						<artifactId>driver-binary-downloader-maven-plugin</artifactId>
						<version>1.0.12</version>
						<configuration>
							<!-- root directory that downloaded driver binaries will be stored 
								in -->
							<onlyGetDriversForHostOperatingSystem>true</onlyGetDriversForHostOperatingSystem>
							<rootStandaloneServerDirectory>.driver</rootStandaloneServerDirectory>
							<customRepositoryMap>webdrivers.xml</customRepositoryMap>
						</configuration>
						<executions>
							<execution>
								<goals>
									<goal>selenium</goal>
								</goals>
							</execution>
						</executions>
					</plugin>
				</plugins>
			</build>
		</profile>
		<profile>
			<!-- For running Gatling tests -->
			<id>scalability</id>
			<activation>
				<property>
					<name>scalability</name>
				</property>
			</activation>
			<dependencies>
				<dependency>
					<groupId>io.gatling.highcharts</groupId>
					<artifactId>gatling-charts-highcharts</artifactId>
					<version>2.2.5</version>
					<scope>test</scope>
				</dependency>
			</dependencies>
			<build>
				<plugins>
					<plugin>
						<groupId>io.gatling</groupId>
						<artifactId>gatling-maven-plugin</artifactId>
						<version>2.2.4</version>
					</plugin>
				</plugins>
			</build>
		</profile>
	</profiles>
</project>

I use Intellij IDEA community version, run command with Windows command prompt as Administrator.
The IDE mark some of dependencies as RED color, so I assumed it’s a dependencies cannot resolved problem.
So I wondered why? Because what did I edit is just add the Central Maven repository and found it still thrown the same error.

2

At quick glance the needed Vaadin dependencies are in this repository

https://repo.maven.apache.org/maven2/com/vaadin/

So it seems that for whatever reason downloading of those have failed. There maybe partially downloaded corrupted files as well. My recommendation is to manually delete corresponding files from .m2 folder and try again.