Learn how to use text blocks in Java 15+ on a currency-rates feed: SQL, JSON and email templates, the indentation rules, six compiler errors and 15 checks.
How to use LinkedHashMap in Java 21: keep insertion order, move entries, and build a small LRU cache with access order, on a library catalogue with 22 checks.
Replace a growing if/else chain with the strategy pattern in Java 21. A library late-fee calculator, built step by step, with lambdas, an EnumMap and 15 checks.
Getting the “Web server failed to start. Port 8080 was already in use” error? Learn how to identify and kill the process blocking port 8080 on Windows and macOS using simple terminal commands. Fix server startup issues fast and keep your development running smoothly.
Learn how to fix NoSuchBeanDefinitionException in Spring Boot with clear examples and best practices for dependency injection, package scanning, and bean registration.
Spring Boot’s DI can backfire with the dreaded BeanCurrentlyInCreationException, signaling an unresolvable circular dependency. Learn why cycles occur, how they breach SOLID principles, and three fixes—refactor to break loops, use @Lazy injection, and static @Bean factory methods—to restore startup.
Gopi Gorantala
