Quarkus 4 vs Spring Boot 4: Java Frameworks Compared for 2026

Quarkus 4 will enter beta in September and reach GA in November 2026, alongside Spring Boot 4.2. Quarkus rewrites its I/O core on Vert.x 5.1.2 and Netty 4.2, adds HTTP/3 and the Signal event bus; Spring focuses on modularity and lazy database connections.

• Quarkus 4.0 Beta 1 in September 2026, GA in November 2026
• Quarkus 3.32 cut REST app startup from 370 ms to 80 ms
• Quarkus 4 moves to Vert.x 5.1.2 and Netty 4.2, HTTP/3 experimental
• Spring Boot 4.2 also planned for November 2026