You are expected to know the technologies you work with. If you use Spring MVC, know it well. Practice explaining the flow. Also, practice answering questions about your project.
Since you haven't interviewed for a
Java job before, I recommend reading a book that mixes the process with sample interview questions such as
Java Programming Interviews Exposed. A lot of interviewing well is practice. After you read the book, see if you can find a tech friend to give you a mock/practice interview. It will give you more confidence for a real one.