Java

Java is a statically typed, object-oriented language that compiles to bytecode and runs on the Java Virtual Machine, so the same build runs on any platform with a JVM. Its mature ecosystem includes the Collections framework, JDBC, JPA with Hibernate for data access and Spring Boot for web services. Java remains a mainstay for enterprise backends and large data systems, with a new long-term support release every two years.

74 articles

10/05/2025 10 min read

JUnit 5: Writing Your First Tests

Executive Summary: A JUnit 5 test is a method annotated @Test that passes when its assertions hold. I…
27/03/2025 6 min read

Code Optimization in Java: Minimize Latency with Profiling

Java latency playbook: allocation and I/O techniques, pooling, async-profiler and JMH guidance, with before/after discipline.
23/02/2025 11 min read

Profiling and Performance Tuning Basics in Java

Executive Summary: Java performance tuning works best as a loop: reproduce under steady state, set a baseline, profile,…
11/01/2025 13 min read

Garbage Collection in Java: Generations, Collectors, and Tuning

Executive Summary: Java garbage collection reclaims objects no GC root can reach and organizes the heap by age…
21/12/2024 12 min read

JVM Memory Areas and Class Loaders: Heap, Stack, Metaspace, and Execution

Executive Summary: When java Main runs, class loaders load your code, the JVM stores data in distinct memory…
21/11/2024 7 min read

Dependency Injection in Spring Boot

Constructor injection, circular dependencies, and advanced Spring Boot DI scenarios with concrete code patterns.
17/11/2024 12 min read

Practice: Build a Concurrent Downloader in Java

Executive Summary: This practice project builds a concurrent link checker in Java two ways: a fixed thread pool…
26/10/2024 12 min read

Structured Concurrency in Java

Executive Summary: Structured concurrency ties subtasks to the scope that started them, so failures and cancellations do not…
14/09/2024 12 min read

Virtual Threads in Java: The New Concurrency Model

Executive Summary: Virtual threads let blocking Java code scale like async code, because a blocked virtual thread frees…
24/08/2024 13 min read

CompletableFuture and Asynchronous Programming in Java

Executive Summary: CompletableFuture builds async work as a pipeline of stages you can transform, chain, and combine. I…
21/07/2024 13 min read

Concurrent Collections in Java

Executive Summary: HashMap breaks under concurrent use, so Java provides concurrent collections built for it. I explain ConcurrentHashMap…
22/06/2024 13 min read

Synchronization and Locks in Java

Executive Summary: Java offers several locking tools, and each solves a different problem. Here I cover synchronized and…
25/05/2024 12 min read

ExecutorService and Thread Pools in Java

Executive Summary: ExecutorService runs tasks on a managed thread pool instead of raw threads. I cover fixed and…
21/04/2024 13 min read

Threads in Java: Creation, Lifecycle, and Coordination

Executive Summary: A Java thread runs a Runnable once you call start, and it moves through a defined…