Primary Keywords:
JDK 21, JDK 17, Java Migration, OpenJDK, LTS

Feature Keywords:
Virtual Threads, Project Loom, Generational ZGC, ZGC, Sequenced Collections

Concept & Tool Keywords:
Microservices, Performance, Scalability, CI/CD, Jenkins, Kubernetes, Run File

Branding Keyword:
Halodoc Engineering

HaloDoc is a healthcare technology platform that offers telemedicine services, online pharmacy, and health information resources to users in Indonesia. Through its platform, HaloDoc aims to improve access to healthcare services, empower patients to take control of their health, and facilitate collaboration between healthcare providers. Developers can learn from HaloDoc's innovative use of technology to address healthcare challenges, leveraging telemedicine, artificial intelligence, and data analytics to enhance patient care and outcomes.

Halodoc

A comprehensive guide covering the migration from JDK 17 to JDK 21, highlighting key benefits like Virtual Threads for improved concurrency and scalability. The article provides a step-by-step technical approach including environment setup, dependency updates, containerization, CI/CD pipeline modifications, and runtime optimization with Generational ZGC. Real-world results show 30% heap usage reduction, stabilized P99 latency, and over 10% infrastructure cost savings for I/O-bound services.

Migrating from JDK 17 to JDK 21: An Overview and Practical Guide