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COMPILE.md

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Build Instructions

Prerequisites

  • Java 17+ (JDK with JNI headers)
  • Visual Studio 2019+ (Community Edition works)
  • Windows 10/11 x64
  • SSE4.2+ CPU (Intel i3/i5/i7/i9 or AMD Ryzen)

Quick Build

# Build native DLL
compile.bat

# Build JAR
mvn clean package -DskipTests

Manual Build

1. Build Native DLL

# Setup Visual Studio environment
call "C:\Program Files\Microsoft Visual Studio\2022\Community\VC\Auxiliary\Build\vcvars64.bat"

# Compile
cl.exe /O2 /arch:AVX2 /EHsc /MD /LD /W3 ^
    /I"%JAVA_HOME%\include" /I"%JAVA_HOME%\include\win32" ^
    native\fastbytes.cpp ^
    /Febuild\fastbytes.dll

2. Build Java

mvn clean compile

3. Run Tests

mvn test

Troubleshooting

"Cannot find jni.h" → Set JAVA_HOME environment variable

"cl.exe not found" → Install Visual Studio C++ tools

"AVX2 not supported" → Remove /arch:AVX2, use /arch:SSE2