very easy ... google on common java question that is more than enough to clear it . They need developer to join organization . but eventually no one joins it They boost of big data technologies but in realty nothing is working till now even after trying from last 3 years. very easy ... google on common java question that is more than enough to clear it . They need developer to join organization . but eventually no one joins it They boost of big data technologies but in realty nothing is working till now even after trying from last 3 years.