OptiSol Business Solutions Private Limited Software Engineer - Java Developer interview questions

As per my knowledge there are 2 rounds 1st round - written codding test 1. Write a program to find the duplicate elements in a given integers list in java using Stream functions? 2. Write a program perform (A+B)^2 using method overloading 3. Write a REST API in spring boot to registering a user. User can have name, age, gender,email fields. Specify the Entity class & User Controller After clearing in round 1 you will be called for round 2 2nd round One to One Technical Interview 1. How will we create API in spring boot ? 2. Validation of fields in Springboot? 3. What is Authentication and Authorization? 4. How much you will rate yourself in SQL? and so on