The documentation sayteh:
"On Linux x86 and Linux x86-64, use JDK 6 (Java SE Development Kit 1.6.0_21) or JDK 5 (1.5.0_24) with the JNDI extension
with the Oracle Java Database Connectivity and Oracle Call Interface drivers.
However, these are not mandatory for the database installation.
Please note that JDK 1.5 is installed with this release."
( http://docs.oracle.com/cd/E11882_01/install.112/e24322/pre_install.htm#CHDIDIGF )
So that's what is supported.
There is no additional certification information on Metalink.