Oracle Full Stack Java Developer interview questions

Probably the worst of all the interviews I have attended. I have applied through linkedin and I got a call from recruiter. Recruiter wanted me to get scheduled for my first interview round and I have specifically asked if I would be asked about Data Structures and Algorithms which I specifically requested her for time to prepare. She confirmed there will not be any TWICE and I agreed for first round of interview. The first thing I notice in coding round is question about Trees. I told the interviewer about the discussion and he changed question to normal Java and asked 2 different coding questions which I did. We completed the interview and I get an email from recruiter that they are not proceeding forward with my candidacy. I have no clue what interviewer felt or if there is any miscommunication between recruiter and the interviewer