what is the scope of oracle with linux?

i m student of bca waiting for my final year result.i am working in leading traing institute as faculty for oracle sql,pl/sql and c ,c++ also.i want to opt database as my career.yesterday i went to HCL traing center for guidence,he told me that there is good scope for oracle on linux plateform. but i have heared that Java is must for oracle profrssionals, is it true please.