Tell about a complex technical problem you managed to solve successfully.

One of the challenging technical problems I faced was related to a memory leak in a Java application that was handling a large amount of data in a multithreaded environment.

The issue manifested as a gradual increase in memory consumption and subsequent application crashes due to OutOfMemoryError.

How I solved it:

1. Used a memory profiler (e.g., VisualVM or YourKit) to analyze heap dumps.
2. Discovered that objects were not being released due to improper use of collections: references to objects remained in static collections that were not cleared.
3. Rewrote the logic for managing these collections, adding explicit removal of elements after use.
4. Optimized the code to reduce the lifespan of objects and avoid unnecessary references.

As a result, the application stopped accumulating garbage, memory consumption stabilized, and overall performance improved.

This experience taught me to carefully monitor the lifecycle of objects and use profiling tools to diagnose memory issues.