my Maven setting.xml

<mirrors>
    <mirror>  
      <id>alimaven</id>  
      <name>aliyun maven</name>  
      <url>http://maven.aliyun.com/nexus/content/groups/public/</url>  
      <mirrorOf>*</mirrorOf>          
    </mirror> 
  </mirrors>


	<profile>
	  <id>net_dev</id>
	  <repositories>
		  <repository>
			<id>alimaven</id>
			<url>http://maven.aliyun.com/nexus/content/repositories/central/</url>
		  </repository>        
		  <repository>
			<id>repo2</id>
			<url>http://repo2.maven.org/maven2/</url>
		  </repository>
		  <repository>
			<id>central</id>
			<url>http://central.maven.org/maven2/</url>			
		  </repository>
		  
		  <!--for vaadin-->
		  <repository>
            <id>vaadin-platform</id>
            <url>https://repo.vaadin.com/nexus/content/repositories/flow</url>
        </repository>

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

        <repository>
            <id>webjars</id>
            <url>https://dl.bintray.com/webjars/maven</url>
        </repository>

        <repository>
            <id>vaadin-prereleases</id>
            <url>https://maven.vaadin.com/vaadin-prereleases</url>
        </repository>
	  </repositories>
	</profile>