The Oracle RightNow adapter has been released for the SOA 12.1.3 just couple of months ago, and I tested as soon as I've heard of it!
Make sure the following patch bundle has been applied to your SOA/jdev Home.
Bundle Patch for Bug: 20423408
The patch can be downloaded from Oracle support of course, and installed using opatch apply.
The patch must be applied to both, the SOA Server home (if not in the jdev home) and Jdev home, since the new plugin which will shows the RightNow adapter wizard, must be configured into JDeveloper.
Remember to perform the post-installation steps (patch READ-ME for details):
1. Log in to Fusion Middleware Control Enterprise Manager.
2. Expand "Weblogic Domain" in the left panel
3. Right click on the domain you want to modify and select Security > System Policies to display the page System Policies. Read the complete article here
For regular information on Oracle SOA Suite become a member in the SOA & BPM Partner Community for registration please visit www.oracle.com/goto/emea/soa (OPN account required) If you need support with your account please contact the Oracle Partner Business Center.