BEWARE: This project hasn't been maintained since 2015. An effort to refresh it (and JNAerator) is ongoing (Nov 2022) and 0.8.0-SNAPSHOT contains a sneak peek of it, with no guarantees.

BridJ


BridJ is a Java / native interoperability library that focuses on speed and ease of use.

It is similar in spirit to JNA (dynamic bindings that don't require any native compilation, unlike JNI), but was designed to support C++, to be blazing fast (thanks to dyncall + hand-optimized assembly tweaks) and to use modern Java features.

A comprehensive documentation is available on its Wiki.

It was previously hosted on ochafik/nativelibs4java.

Quick links

Note: the Wiki is being refreshed.

• Usage (also see Examples/BasicExample)
• FAQ
• CHANGELOG
• JavaDoc
• Credits and License

Building

git clone http://github.com/nativelibs4java/BridJ.git
cd BridJ
mvn clean install

Iterate on native code:

mvn native:javah
./BuildNative && mvn surefire:test

Cross-compiling

Prerequisites

Assuming you have docker:

# One-off to let Docker use QEMU to run exotic architectures.
docker run --rm --privileged multiarch/qemu-user-static --reset -p yes --credential yes

# Install the cross-compiler for Windows
# sudo apt install mingw-w64
brew install mingw-w64

# https://jdk.java.net/archive/

# Get JDK for Mac ARM64 & X64
wget https://download.java.net/java/GA/jdk19/877d6127e982470ba2a7faa31cc93d04/36/GPL/openjdk-19_macos-{x64,aarch64}_bin.tar.gz && \
  tar zxvf openjdk-19_macos-aarch64_bin.tar.gz && mv jdk-19.jdk{,-darwin_arm64} && \
  tar zxvf openjdk-19_macos-x64_bin.tar.gz && mv jdk-19.jdk{,-darwin_x64} \

# Get JDK for Windows X64
wget https://download.java.net/java/GA/jdk19/877d6127e982470ba2a7faa31cc93d04/36/GPL/openjdk-19_windows-x64_bin.zip && \
    unzip openjdk-19_windows-x64_bin.zip && mv jdk-19{,-windows_x64}

# Get JDK for Windows ARM64
wget https://github.com/microsoft/openjdk-aarch64/releases/download/jdk-16.0.2-ga/microsoft-jdk-16.0.2.7.1-linux-aarch64.tar.gz && \
  tar zxvf openjdk-19_macos-aarch64_bin.tar.gz && mv jdk-16.0.2+7{,-windows_arm64}

wget https://builds.openlogic.com/downloadJDK/openlogic-openjdk/8u352-b08/openlogic-openjdk-8u352-b08-windows-x32.zip && \
    unzip openlogic-openjdk-8u352-b08-windows-x32.zip

Cross-build commands

# Mac host: build Mac M1 & Intel binaries
ARCH=x64 ./BuildNative -DFORCE_JAVA_HOME=$PWD/../jdk-19.jdk-darwin_x64/Contents/Home
ARCH=arm64 ./BuildNative -DFORCE_JAVA_HOME=$PWD/../jdk-19.jdk-darwin_arm64/Contents/Home

# Mac or Linux host: build Windows X64 & X86 binaries w/ MinGW-w64
OS=windows ARCH=x64 ./BuildNative \
  -DCMAKE_TOOLCHAIN_FILE=$PWD/mingw-w64-x86_64.cmake \
  -DFORCE_JAVA_HOME=$PWD/../jdk-19-windows_x64
OS=windows ARCH=x86 ./BuildNative \
  -DCMAKE_TOOLCHAIN_FILE=$PWD/mingw-w64-i686.cmake \
  -DFORCE_JAVA_HOME=$PWD/../openlogic-openjdk-8u352-b08-windows-32

# Mac or Linux host: build & test Linux x86, x64, arm64, arm binaries inside Docker + QEMU:
# TODO: look at armel situation (no openjdk?)
         ./scripts/build-docker-qemu.sh linux/x86_64   debian:bullseye-slim           bridj-linux-x64
ARCH=x86 ./scripts/build-docker-qemu.sh linux/i386     i386/debian:bullseye-slim      bridj-linux-x86
         ./scripts/build-docker-qemu.sh linux/arm64    arm64v8/debian:bullseye-slim   bridj-linux-arm64
         ./scripts/build-docker-qemu.sh linux/arm/v7   arm32v7/debian:bullseye-slim   bridj-linux-arm
         ./scripts/build-docker-qemu.sh linux/ppc64le  ppc64le/debian:bullseye-slim   bridj-linux-ppc64le
#        ./scripts/build-docker-qemu.sh linux/arm/v6 balenalib/rpi-raspbian:bullseye bridj-linux-armel

# Windows x64 host (UNTESTED): build Windows X64 & ARM64 binary
ARCH=x64 ./BuildNative
ARCH=arm64 ./BuildNative -DFORCE_JAVA_HOME=$PWD/../jdk-16.0.2+7-windows_arm64

Debugging

mvn dependency:build-classpath -DincludeScope=test -Dmdep.outputFile=deps-classpath-test.txt
DEBUG=1 mvn clean test-compile

# Or gdb --args java ...
lldb -- java -cp \
  target/generated-resources:target/generated-test-resources:target/test-classes:target/classes:$( cat deps-classpath-test.txt ) \
  org.junit.runner.JUnitCore \
  org.bridj.BridJTest

Formatting

mvn format

Support

Please use the mailing-list and file bugs.

TODO

• Build for MIPS, PPC64Le, Sparc, Sparc64, s390x linux https://hub.docker.com/_/debian i386, mips64le, ppc64le, riscv64, s390x https://github.com/multiarch/qemu-user-static https://hub.docker.com/layers/qemu-user-static/multiarch/qemu-user-static/x86_64-sparc-7.0.0-7/images/sha256-bf38e980ec9303b8942b8a79c1a856d019a6b3f2f16ce0c36973c28110f0015f?context=explore https://github.com/docker-library/official-images#architectures-other-than-amd64 https://hub.docker.com/r/arm32v5/debian https://hub.docker.com/r/arm32v5/clojure https://hub.docker.com/r/mips64le/debian
• Build for Sparc Solaris https://hub.docker.com/r/netcrave/sparcsolaris
• Try armel vs. arm32v5
• Rebuild for Android, cmake-style
• Factor some cruft into cmake helpers
• CI w/ all the cross builds (use upload / download artefact github actions)
• Separate ARM / x86_64 builds on Darwin (link w/ ARM JDK https://jdk.java.net/archive/), or scripting to create fat libjvm.dylib and libjawt.dylib
• Update pom to make it independent from nativelibs4java-parent
• Update deps: ASM 5.x, JUnit 4.11
• Fix BridJ's armhf support