This is a Gradle plugin for integrating Project Panama's jextract tool in the build process. There is also a full demo project showcasing the gradle-jextract plugin.

💡   Example

Since the plugin is available on Gradle's Plugin Portal it can be applied within the build script's plugins block.

plugins {
  id "io.github.krakowski.jextract" version "0.5.0"
}

Applying the plugin adds the jextract task which can be configured by the build script.

jextract {

    header("${project.projectDir}/src/main/c/stdio.h") {
        // The library name
        libraries = [ 'stdc++' ]
    
        // The package under which all source files will be generated
        targetPackage = 'org.unix'
        
        // The generated class name
        className = 'Linux'
    }
}

If the Gradle Java Plugin or Application plugin is applied, the gradle-jextract plugin configures them and uses the configured toolchain for its task, which can be set as follows.

java {
    toolchain {
        languageVersion.set(JavaLanguageVersion.of(22))
    }
}

If your JDK is not installed in one of the default locations, Gradle can be instructed to search in a custom location. To enable this feature the org.gradle.java.installations.paths property has to be set within your global gradle.properties file usually located inside ${HOME}/.gradle.

org.gradle.java.installations.paths=/custom/path/jdk22

The plugin will first try to find jextract inside PATH and then fall back to ${JAVA_HOME}/bin.

📐   Configuration Options

The jextract task exposes the following configuration options.

Name	Type	Required	Description
libraries	java.lang.String[]		The libraries against which the native code will link ¹
includes	java.lang.String[]		A list of directories which should be included during code generation
targetPackage	java.lang.String	⚫	The package under which all bindings will be generated
className	java.lang.String		The generated class file's name
functions	java.lang.String[]		Whitelist of function symbols
constants	java.lang.String[]		Whitelist of macro and enum constant symbols
structs	java.lang.String[]		Whitelist of struct symbols
typedefs	java.lang.String[]		Whitelist of typedef symbols
unions	java.lang.String[]		Whitelist of union symbols
variables	java.lang.String[]		Whitelist of global variable symbols
definedMacros	java.lang.String[]		List of additional defined C preprocessor macros
useSystemLoadLibrary	java.lang.Boolean		Load libraries into the loader symbol lookup
outputDir	org.gradle.api.file.Directory		The output directory under which the generated source files will be placed

📗   Notes

¹ libraries option can use simple library name "stdc++" or full path to the shared libraries. Full path need to be prefixed with ":" character. For example ":/usr/lib/libstdc++.so" doc

🔧   Requirements

• OpenJDK 22
• Project Jextract

📜   License

This project is licensed under the GNU GPLv3 License - see the LICENSE file for details.