Using insecure protocols with repositories without explicit opt-in is unsupported Switch Maven repository mavenhttpmavenaliyuncomnexuscontentgroupspublic to redirect to a secure protocol like HTTPS

To switch the Maven repository from an insecure protocol (HTTP) to a secure protocol (HTTPS), you need to modify your Maven settings.

Open the settings.xml file located in your Maven installation's conf directory. If the file is not present, you can create one using a text editor.
Look for the <repositories> section in the file. If it doesn't exist, you can add it. It should look something like this:

<repositories>
  <repository>
    <id>central</id>
    <url>http://repo.maven.apache.org/maven2</url>
    <releases>
      <enabled>true</enabled>
    </releases>
    <snapshots>
      <enabled>false</enabled>
    </snapshots>
  </repository>
</repositories>

Find the repository element that corresponds to the Aliyun repository (maven(http://maven.aliyun.com/nexus/content/groups/public/) in your case) and modify the URL to use HTTPS instead of HTTP. The modified repository element should look like this:

<repository>
  <id>aliyun</id>
  <url>https://maven.aliyun.com/nexus/content/groups/public/</url>
  <releases>
    <enabled>true</enabled>
  </releases>
  <snapshots>
    <enabled>false</enabled>
  </snapshots>
</repository>

Save the settings.xml file.

Now, Maven will use the secure HTTPS protocol to access the Aliyun repository