IBM Full Stack Java Developer interview questions

It was not that good, interviewer was rude. No Intro and at end when I tried to ask something he ignored Although hr communication was good toipics for interview: spring bean ,autowire,bean cycle

I applied online. Initial screening with the HR recruiter followed by a phone interview. Then 1 online interview with medium difficulty. The interview was excellent and I was able to describe every situation they asked for (mostly my past Java Developer experience). I was expecting something good to happen, but it ended with a rejection mail. The reason is still unknown! I asked for feedback from the recruiter and still waiting. Well, I am not discouraging anyone but things happen! I am frustrated and lost a bit of confidence after having the rejection letter. Whenever I got a rejection email, I understand but this time I am blank and seeking opportunities, anyway.