Introduction

For a long time, Java was associated with large, monolithic enterprise applications running on heavyweight application servers.

Then the industry shifted toward:

• Microservices
• Containers
• Cloud-native architectures
• Kubernetes

Many assumed Java would struggle to adapt.

Instead, Java evolved — and in many cases, thrived.

From Monoliths to Microservices

Early Java enterprise applications often relied on:

• Large EAR/WAR deployments
• Heavy application servers
• Centralized databases

Modern Java architectures look very different:

• Small, focused services
• Independent deployments
• Stateless APIs
• Horizontal scalability

Frameworks like Spring Boot dramatically simplified Java service development by removing boilerplate and enabling rapid startup.