Answer to the question is provided on threads:
Hope this answers your question
Thanks for the pointer!
These system come preinstalled - by beans of automatic software distribution - with a standard JDK and multiple ORACLE_HOMEs containing JDKs/JREs. I cannot simply uninstall these JVMs without breaking the pre-existing Software (namely Oracle Weblogic and OFM Forms/Reports, Oracle Client 11g R2). The whole point of the exercise is to have Oracle Designer 10g installed alongside these products for software maintenance purposes.
Is there a way to force OUI to use it's own JVM?