Spring Boot applications running as GraalVM native images start in milliseconds, use a fraction of the memory, and fit in tiny containers. The tradeoff is a longer build time. In 2026, with Spring Boot 4 and GraalVM 24, native images are production-ready for most Spring applications. This guide covers everything: what Spring AOT does, how to build your first native image, how to fix the common issues, and how to add native builds to CI.

A regular Spring Boot application takes 2–10 seconds to start. A GraalVM native image of the same application starts in under 100 milliseconds. For serverless functions, batch jobs, and CLI tools, this is the difference between viable and unusable. What Is a Native Image? GraalVM’s native image compiler performs ahead-of-time (AOT) compilation. Instead of shipping a JAR that the JVM interprets at runtime, you ship a standalone executable that: Contains only the code your application actually uses Has no JVM startup overhead Uses much less memory (no JIT compiler, no class metadata) Starts in milliseconds The tradeoff: compile time increases from seconds to minutes.