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Java FAQ: Top Questions

68. What is the GraalVM and how does it differ from HotSpot?

GraalVM is a high-performance, polyglot JVM that supports Java and other languages, featuring an advanced JIT compiler and ahead-of-time (AOT) compilation via Native Image.

  • GraalVM vs. HotSpot:
    • JIT Compiler: GraalVM uses Graal JIT (more aggressive optimizations) vs. HotSpot’s C1/C2.
    • AOT: GraalVM supports Native Image for faster startup, unlike HotSpot.
    • Polyglot: GraalVM runs JavaScript, Python, etc., natively.
    • Compatibility: GraalVM is a drop-in JVM replacement but may differ in GC or features.
  • Use Case: Cloud-native apps, microservices, polyglot systems.
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