Java
  • Java Workshops
    • JEPS
      • JEP 286: Local-Variable Type Inference
      • JEP 404: Generational Shenandoah
      • JEP 450 : Compact Object Headers i
      • JEP 472 : Prepare to Restrict the Use of JNI
      • JEP 475 : Late Barrier Expansion for G1
      • JEP 478 : Key Derivation Function API
      • JEP 479: Remove the Windows 32-bit x86 Port
      • JEP 483: Ahead-of-Time Class Loading & Linking
      • JEP 484: Class-File API
      • JEP 485: Stream Gatherers
      • JEP 486: Permanently Disable the Security Manager
      • JEP 487: Scoped Values (Fourth Preview)
      • JEP 488: Primitive Types in Patterns, instanceof, and switch (Second Preview)
      • JEP 489: Vector API (Ninth Incubator)
      • JEP 490: ZGC: Remove the Non-Generational Mode
      • JEP 491: Synchronize Virtual Threads without Pinning
      • JEP 492: Flexible Constructor Bodies (Third Preview)
      • JEP 494: Module Import Declarations (Second Preview)
      • JEP 495: Simple Source Files and Instance Main Methods (Fourth Preview)
      • JEP 496: Quantum-Resistant Module-Lattice-Based Key Encapsulation Mechanism
      • JEP 497: Quantum-Resistant Module-Lattice-Based Digital Signature Algorithm
      • JEP 499: Structured Concurrency
      • JEP 501: Deprecate the 32-bit x86 Port for Removal
    • TODO
    • Workshops
      • JDK24 workshop
Powered by GitBook
On this page
  1. Java Workshops
  2. JEPS

JEP 472 : Prepare to Restrict the Use of JNI

PreviousJEP 450 : Compact Object Headers iNextJEP 475 : Late Barrier Expansion for G1

Last updated 9 days ago

  • Part of bigger initiative :

  • alternative -

    • so called "project Panama"

    • import java.lang.foreign.*;

Deprecate and eventually restrict JNI. Users will need to explicitly enable it via flags like --enable-jni.

To run example you need gcc compiler: 

sudo apt update
sudo apt install build-essential

Compile c files 

./scripts/jep472/build-native.sh

and run NativeAbs app. You will see warnings : 

./scripts/jep472/run-native.sh 

Running com.wlodar.jeeps.jep472JNIwarnings.NativeAbs with native library from libs...
WARNING: A restricted method in java.lang.System has been called
WARNING: java.lang.System::loadLibrary has been called by com.wlodar.jeeps.jep472JNIwarnings.NativeAbs in an unnamed module (file:/home/pawel/IdeaProjects/HelloJava1/target/classes/)
WARNING: Use --enable-native-access=ALL-UNNAMED to avoid a warning for callers in this module
WARNING: Restricted methods will be blocked in a future release unless native access is enabled

abs(-42) = 42

Integrity by default
JEP 472
JEP 454: Foreign Function & Memory API