spring-boot

Spring Boot 4 Complete Enterprise Guide: Native AOT & Virtual Threads

Deep-dive into Spring Boot 4 capabilities: Virtual Threads (Project Loom), GraalVM Native Image compilation, HTTP interfaces, and high-performance microservices.

InfoSkills Engineering Team|Aug 1, 2026|8 min read

# Spring Boot 4 Enterprise Architecture Guide

Spring Boot 4 represents a major evolution in Java enterprise engineering. With native support for Virtual Threads (Project Loom), AOT compilation via GraalVM, and reactive stream optimizations, building high-throughput services is faster than ever.

## 1. Virtual Threads Configuration

Virtual Threads allow thousands of concurrent requests without thread-per-request OS overhead:

```yaml
server:
  port: 8080
spring:
  threads:
    virtual:
      enabled: true
```

## 2. Declarative HTTP Interfaces

Define REST clients cleanly with explicit annotations:

```java
@HttpExchange("/api/v1/users")
public interface UserClient {
    @GetExchange("/{id}")
    UserResponse getUserById(@PathVariable("id") String id);
}
```

## 3. Production Readiness Checklist

1. Enable Actuator health endpoints with custom metrics.
2. Use Connection Pooling (HikariCP) with tuned queue sizes.
3. Enforce Distributed Tracing via Micrometer and Zipkin.
    