If you are behind a firewall, make sure you configure proxy in the Maven settings.xml file. Proxy can be configured as follows:

<settings> 
    ... 
    <proxies> 
        <proxy> 
            <active>true</active> 
            <protocol>http</protocol> 
            <host>proxy.demo.com</host> 
            <port>8080</port> 
            <username>demouser</username>
            <password>demopassword</password>
            <nonProxyHosts>localhost|*.demosite.com</nonProxyHosts> 
        </proxy> 
    </proxies> 
    ... 
</settings>

Find more about that and other aspects of Maven at http://maven.apache.org/index.html.

If you are a developer, in many cases you will have Maven already installed in your local machine. In that case, point the M2_HOME directory to your local Maven and update the respective settings.xml with the repository details in the default settings.xml that ships with the Atlassian Plugin SDK.

Or you can simply add the following to the existing settings.xml:

<pluginRepository> 
    <id>atlassian-plugin-sdk</id> 
    <url>file://${env.ATLAS_HOME}/repository</url> 
    <releases> 
        <enabled>true</enabled> 
        <checksumPolicy>warn</checksumPolicy> 
    </releases> 
    <snapshots> 
        <enabled>false</enabled> 
    </snapshots> 
</pluginRepository> 

If you are using IntelliJ IDEA, it is an easy job because IDEA integrates Maven out of the box. Just load the project by selecting the pom.xml! See https://developer.atlassian.com/docs/developer-tools/working-in-an-ide/configure-idea-to-use-the-sdk for details.

If you are using Eclipse, make sure you have M2Eclipse installed. This is because Eclipse integrates Maven through the Sonatype M2Eclipse plugin. You can find more details on configuring this at https://developer.atlassian.com/docs/getting-started/set-up-the-atlassian-plugin-sdk-and-build-a-project/set-up-the-eclipse-ide-for-linux or https://developer.atlassian.com/docs/getting-started/set-up-the-atlassian-plugin-sdk-and-build-a-project/set-up-the-eclipse-ide-for-windows, depending on the OS.

For NetBeans, see https://developer.atlassian.com/docs/developer-tools/working-in-an-ide/configure-netbeans-to-use-the-sdk.

If you see Maven download errors such as Could not resolve artifact, make sure you verify the following: