When I do the same on my environment do not see the warnings you are encountering:
java version "1.6.0_45"
Java(TM) SE Runtime Environment (build 1.6.0_45-b06)
Oracle JRockit(R) (build R28.2.7-7-155314-1.6.0_45-20130329-0646-windows-x86_64, compiled mode)
What can be the case is that your machine is not actually 64-bit, i.e., that the hardware virtualization extensions (VT in the case of Intel) of your processor are not enabled (this is just a guess) - steps on how to do that are provided here: https://access.redhat.com/site/documentation/en-US/Red_Hat_Enterprise_Linux/6/html/Virtualization_Administration_Guide/s….
"Should I abandon JRockit?" No I think not, some examples that included WebLogic and JRockit set-up can be found here: Middleware Snippets: JRockit. All in all JRockit runs very smooth (never had any problem with it), but if the warnings do not go away, it is better to use something else (you never know what these lead to in a production environment).
Firstly installation of SOA 22.214.171.124 is not certified on Windows 7 Opertating system .
This is un supported configuration.
You can go through the Middleware certification matrix :
Access the XLS sheet for "System Requirements and Supported Platforms for Oracle Fusion Middleware 11gR1"