I was invited for an in-person technical interview. There were two 1:1 interviews. Each session took about one hour.

The questions ranged from:

• Core Java questions
• Spring
• Hibernate
• SQL

In my opinion, the interview went very well. I could answer most of the questions and demonstrate my expertise in Java and SQL. Still, in the end, they did not give me an offer. The reason was a little bit ridiculous. They told me that I couldn't answer one very specific question on the Spring framework, but everything else was good. In my opinion, one of the interviewers had less knowledge in some core Java concepts than me. I therefore suspect that the true reason for giving me negative feedback was just the interviewer's fear that there could be someone else on the team with more knowledge in some areas.

How does HashMap work in Java?