Currently it looks like CA Directory only supports upto Java 7.
We would like to update Siteminder (single sign on) from Java 7 to Java 8 but cannot do that until the CA Directory component supports Java 8.
Oracle has ended support for Java 7 earlier this year and so we need to migrate to Java 8.
The CA Directory package and tools are C-based and therefore not impacted by Java runtime environment versions.
If you are referring to DXmanager, then yes Java 8 support has been included in our recent 12.0.17 GA release.