Share examples of tasks that you found interesting to solve in your practice.

In my Java practice, I was interested in solving tasks related to optimizing the performance of multithreaded applications, such as developing and debugging thread pools for handling a large number of requests. I was also engaged in tasks involving integration with external APIs and building REST services using Spring Boot.

An example of an interesting task is implementing data caching using ConcurrentHashMap and ScheduledExecutorService to update the cache on a schedule, which significantly reduced the load on the database.