- Singleton, Young and old generation garbage collection, Make 2 HTTP request with completable future and merge 2 response. give some code to fix it
- Redis related - is it persistent?
- master-slave Redis cluster - if data missed in master what it will return
- different HTTP method and how it used?
- what is the purpose of the OPTION method?
- is restful API state-full or stateless? and why?
- is singleton thread safe or not? how to make it threadsafe?
- serialization? where it used?
- if any class have 5 property and if they want to make 4 property serialized, how can I do it?
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- What is synchronization?
- Recursion related multiple issue understanding and related code optimization.
