Java

SQL: how to select all duplicate values in the email column?

Two objects refer to each other, but no one else refers to them. Will the garbage collector find them?

Experience with Docker and Docker Compose? How deep?

Могут ли Entity-сущности наследоваться? Как происходит маппинг в БД?

Are Hibernate relationships (OneToOne, OneToMany, ManyToOne, ManyToMany) eager or lazy by default?

How to solve the race condition problem? How do atomic operations solve this problem?

What tests did you have to write? What coverage did you maintain?

Experience with SSO?

How deeply do you work with Kafka?

Kafka: 4 consumers in different consumer groups read from a single topic with 3 partitions — what will happen?

Which versions of Java do you work with? Which one are you currently coding in?

Kafka: how is reading distributed with a topic with 3 partitions and 2 consumers in one group?

What is the difference between map and flatMap in the Stream API?

Sum 200 numbers. Should you use a regular or parallel stream?

Heap and Stack: where is what stored, who is responsible for what?

When should you use Singleton and when Prototype?

Docker and Kubernetes: how to embed a certificate file into a container without rebuilding the image and restarting Compose?

Is there an understanding of the principles of distributed systems development?

Tell us about your experience and current project.

Experience with relational databases and other DBs?