Yea it uses built-in java on the SEPM itself.
The client-side does not require java. The only reason a client would need java on it is to run the remote console. But again not needed other than for this.
The version for 12.1.6 MP3 is 7.0.800.15 (SE7 U80)
To check the version yours is running just look at C:\Program Files\Symantec\Symantec Endpoint Protection Manager\jre\bin and look at the version for java.exe