How do I configure Java security settings, etc?

The name of the control panel is different depending on whether you are using the Oracle JDK or OpenJDK.

Search for "control panel" in the dash. If you're using the Oracle JDK, you'll see the Oracle Java 7 Plugin Control Panel. If you're using OpenJDK, you'll see the Iced Tea Web Control Panel.

Search for "java" in dash and it will show java control panel. Images from what it shows when started:

To configure certificates in Java control panel for OpenJDK or IcedTea-Web use the command:

javaws -viewer