...
  <repository>
    <id>maven.oracle.com</id>
    <name>oracle-maven-repo</name>
    <url>https://maven.oracle.com</url>
...

<settings>

<servers>
  <server>
    <id>maven.oracle.com </id>
    <username>....</username>
    <password>{....}

</password>
  </server>
  </servers>
</settings>

<settingsSecurity>
<master>{....}</master>
</settingsSecurity>

[ERROR] Failed to execute goal on project Spring-Maven-Demo: Could not resolve dependencies for project com.maven.rea_spring:Spring-Maven-Demo:war:0.0.1-SNAPSHOT: Failed to collect dependencies at com.oracle.jdbc:ojdbc8:jar:18.3.0.0: Failed to read artifact descriptor for com.oracle.jdbc:ojdbc8:jar:18.3.0.0: Could not transfer artifact com.oracle.jdbc:ojdbc8:pom:18.3.0.0 from/to maven.oracle.com (https://maven.oracle.com): Not authorized , ReasonPhrase:Authorization Required. -> [Help 1]