A practical guide to Spring Boot monitoring, covering Actuator setup, JVM and application metrics, PromQL queries, dependency health, and alert thresholds.

Understand IoC and dependency injection through a Java example, then explore Spring bean configuration, injection styles, scopes, and common mistakes.

Learn how Python strings work, from quotes and escape sequences to f-strings, raw strings, bytes, format specifiers, and everyday string methods.

Learn what Java's volatile keyword guarantees, how happens-before and instruction reordering work, why volatile is not atomic, and when to use it instead of synchronization.

A production-focused guide to finding and fixing HikariCP connection leaks, long transactions, slow SQL, undersized pools, and excessive concurrency in Spring Boot.

Review core Java collections, concurrency, JVM internals, Spring, Spring Security, transactions, and MySQL through 15 common backend interview questions.

Learn why mixing int and Integer in a Java ternary expression can trigger a surprising NullPointerException—and how to avoid it.

Understand sockets, the WebSocket protocol, its HTTP upgrade handshake, data framing, and how WebSocket compares with HTTP.