Java

What did you do when your system was slow due to GC?

The leader received a message, responded OK, then crashed. The new leader does not have this message. What should be done?

What to pay attention to when analyzing Heap Dump?

What delivery guarantees does Kafka have? How does exactly-once work?

Why is the prototype scope needed at all? Isn't one singleton enough?

How did your service work? Did it accept REST, perform some actions, and send REST responses?

Tell me about your last job, what did you do?

What scopes of beans do you know in Spring?

There is a long query, while it is running, another session updates and commits changes. Will the first query see the changes?

Tell about the lifecycle of a Spring Bean?

How does retained size differ from shallow size?

At what stage are proxies created (for @Transactional, @Async, etc.)?

What version of Java do you have?

How does Kafka work with multiple pods in one consumer group? If the first reads a message, will the second see it?

What tool did you use for Heap Dump analysis?

What happens if you implement singleton in a prototype?