Using the Oracle Maven Repository with Nexus 2:

Nexus 3 versions do not yet have support for proxying maven.oracle.com

https://issues.sonatype.org/browse/NEXUS-10164

Video:
https://www.youtube.com/watch?v=ose6oXq7g7E

Article:
https://support.sonatype.com/hc/en-us/articles/213465728-How-to-configure-a-proxy-repository-to-maven-oracle-com

License should be approved:
https://www.oracle.com/webapps/maven/register/license.html

For Oracle ADF projects:

As it turns out the 12.2.1.0.0 version is available but Nexus doesn’t display it but when you request a 12.2.1.0.0 POM file it will be served as expected.

https://community.oracle.com/thread/3925202?start=0&tstart=0

$ cd /opt/nexus/current/conf
$ cp nexus.properties nexus.properties.orig

$ vi nexus.properties

add in the bottom:

# Comma separated list of hostnames that needs to accept circular redirections
nexus.remoteStorage.enableCircularRedirectsForHosts=maven.oracle.com
# Comma separated list of hostnames that benefit from using cookies
nexus.remoteStorage.useCookiesForHosts=maven.oracle.com

$ nexus restart

http://localhost:8081/nexus/

Repositories -> Add –> Proxy Repository

Repository ID: maven-oracle
Repository Name: Maven Oracle

Remote Storage Location: http://maven.oracle.com

Authentication.

Your Username:
Your Password:

SAVE

Public Repositories (group) –> configuration

Move Maven Oracle to left

Setup Default Maven Properties to use Nexus Repos

$ mkdir -p /home/developer/.m2/

$ vi /home/developer/.m2/settings.xml

My config. I will update it later (i hope).

<settings>
    <profiles>
        <profile>
          <id>main</id>
          <activation>
            <activeByDefault>true</activeByDefault>
          </activation>
          <repositories>
            <repository>
              <id>Public Repositories</id>
              <url>http://localhost:8081/nexus/content/groups/public/</url>
              <layout>default</layout>
              <releases>
                <enabled>true</enabled>
              </releases>
            </repository>
          </repositories>
          <pluginRepositories>
            <pluginRepository>
              <id>Public Repositories</id>
              <url>http://localhost:8081/nexus/content/groups/public/</url>
            </pluginRepository>
          </pluginRepositories>
        </profile>
      </profiles>
</settings>