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The latest GraalVM release brings major improvements for easy migration, even higher performance, and better developer experience. In this session, we’ll look at what’s new in GraalVM 25, how it helps build faster and more secure native executables, and what’s coming next.

Some of the new features we will cover:
– Easy migration with ` -H:Preserve`
– ML for high performance out of the box
– Performance profiling
– Security by default
– New tools

We’ll also take a sneak peek at Project Crema, which will lift native compilation’s default closed-world assumption by allowing dynamic loading and execution of classes at run time.

Devoxx

GraalVM 25 introduces several notable features for native image compilation. ML-enabled profile inference (MLPGO) is now triggered automatically at the -O3 optimization level, providing significant throughput improvements in a single build step without requiring manual profiling runs. A new `--preserve` flag helps migrate legacy applications by instructing native image to include entire packages or modules without dead-code elimination. Security improvements include expanded SBOM generation options (including class-level SBOMs) and advanced obfuscation with a mapping file for debugging. Build reports now include a dynamic access report and flame graphs. Looking ahead, GraalVM is working on native image layers (incremental recompilation), Shenandoah GC support for native image, WebAssembly integration, and Project Kama — an open-world native image that supports loading new classes at runtime, breaking the traditional closed-world assumption.

GraalVM 25: What's New and What's Next by Alina Yurenko