L1) string to integer, list of list extraction, how test interfaces using junit, modules with in modules in angualr 12, If customer wants big file to download, how can you do that? L2) what is string interpolation. MultiThreading L3) overview of projects and asked me about kafka,Microservices. L4) Project Architecture, spring micro services ,application authentication, auditing using hiberante, how to update only few fields in entity class if it has static values, diff b/w hashset and hashmap, data normalixation and denormalization, how to upload large files,how to read large excel files,executors services ,Horizontal scaling vs Vertical scaling