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Java to Strengthen Immutability of Final Fields

2025-03-31

To enhance the safety and performance of Java programs, the JDK plans to strengthen the immutability of final fields. Currently, deep reflection can modify final fields, which violates the original intention of the final keyword and limits JVM optimization. Future releases will default to prohibiting deep reflection from modifying final fields and will issue warnings. Developers can selectively enable modification of final fields using the `--enable-final-field-mutation` option, but it is recommended to avoid it as much as possible. This move aims to improve Java's "security by default" feature and maintain consistency with the design of record classes.

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(openjdk.org)
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Java JEP 483: Ahead-of-Time Class Loading & Linking Boosts Startup Time

2024-12-22

JEP 483 significantly improves Java application startup time by loading and linking application classes ahead of time when the HotSpot JVM starts. It achieves this by monitoring a single application run, storing the loaded and linked forms of all classes in a cache for reuse in subsequent runs. This feature requires no code changes and offers substantial speed improvements for large server applications, such as Spring PetClinic showing a 42% reduction in startup time. While currently a two-step process, future versions will streamline cache creation to a single step and offer more flexible training run configuration.

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