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Support JNA over Static JNI on GraalVM
Implements a new optional linkage feature, called Static JNI, under GraalVM Native Image. With `com.sun.jna.SubstrateStaticJNA` enabled (opt-in), JNA is loaded eagerly at image build time, and then linked against a static copy of `libjnidispatch` at image link-time. The result is that `libjnidispatch.a` is embedded within the final image. No precursor library unpacking step is necessary before using JNA in this circumstance, because JNA's native layer is built directly into the image itself. - feat: implement static jni feature - chore: full gvm ci build - chore: add static jni sample Signed-off-by: Sam Gammon <sam@elide.ventures> Signed-off-by: Dario Valdespino <dario@elide.ventures> Co-authored-by: Sam Gammon <sam@elide.ventures> Co-authored-by: Dario Valdespino <dario@elide.ventures>
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| /.gradle | ||
| /build |
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| # JNA Sample: GraalVM Native Image (Static) | ||
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| This directory contains a sample Gradle project which uses JNA with [GraalVM](https://graalvm.org/). The project builds a | ||
| [native image](https://www.graalvm.org/latest/reference-manual/native-image/) which uses JNA features, powered by JNA's integration library for Substrate. | ||
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| This sample leverages [Static JNI](https://www.blog.akhil.cc/static-jni) to build JNA and JNA-related user code | ||
| directly into the native image. | ||
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| Using this technique can optimize startup time and other performance factors, because no dynamic library unpack-and-load | ||
| step is required to use JNA. |
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| /* Copyright (c) 2015 Adam Marcionek, All Rights Reserved | ||
| * | ||
| * The contents of this file is dual-licensed under 2 | ||
| * alternative Open Source/Free licenses: LGPL 2.1 or later and | ||
| * Apache License 2.0. (starting with JNA version 4.0.0). | ||
| * | ||
| * You can freely decide which license you want to apply to | ||
| * the project. | ||
| * | ||
| * You may obtain a copy of the LGPL License at: | ||
| * | ||
| * http://www.gnu.org/licenses/licenses.html | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "LGPL2.1". | ||
| * | ||
| * You may obtain a copy of the Apache License at: | ||
| * | ||
| * http://www.apache.org/licenses/ | ||
| * | ||
| * A copy is also included in the downloadable source code package | ||
| * containing JNA, in file "AL2.0". | ||
| */ | ||
| plugins { | ||
| java | ||
| application | ||
| alias(libs.plugins.graalvm) | ||
| } | ||
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| application { | ||
| mainClass = "com.example.JnaNative" | ||
| } | ||
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| java { | ||
| toolchain { | ||
| languageVersion = JavaLanguageVersion.of(22) | ||
| vendor = JvmVendorSpec.GRAAL_VM | ||
| } | ||
| } | ||
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| dependencies { | ||
| implementation(libs.bundles.jna) | ||
| implementation(libs.bundles.graalvm.api) | ||
| nativeImageClasspath(libs.jna.graalvm) | ||
| } | ||
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| val nativeImageDebug: String by properties | ||
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| graalvmNative { | ||
| testSupport = true | ||
| toolchainDetection = false | ||
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| binaries { | ||
| named("main") { | ||
| buildArgs.addAll(listOf( | ||
| "--features=com.sun.jna.SubstrateStaticJNA", | ||
| ).plus(if (nativeImageDebug != "true") emptyList() else listOf( | ||
| "--verbose", | ||
| "--debug-attach", | ||
| "-J-Xlog:library=info", | ||
| "-H:+UnlockExperimentalVMOptions", | ||
| "-H:+JNIEnhancedErrorCodes", | ||
| "-H:+SourceLevelDebug", | ||
| "-H:-DeleteLocalSymbols", | ||
| "-H:-RemoveUnusedSymbols", | ||
| "-H:+PreserveFramePointer", | ||
| "-H:+ReportExceptionStackTraces", | ||
| "-H:CCompilerOption=-v", | ||
| "-H:NativeLinkerOption=-v", | ||
| ))) | ||
| } | ||
| } | ||
| } | ||
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| // Allow the outer Ant build to override the version of JNA or GraalVM. | ||
| // These properties are used in JNA's CI and don't need to be in projects that use JNA. | ||
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| val jnaVersion: String by properties | ||
| val graalvmVersion: String by properties | ||
| val overrides = jnaVersion.isNotBlank() || graalvmVersion.isNotBlank() | ||
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| if (overrides) configurations.all { | ||
| resolutionStrategy.eachDependency { | ||
| if (requested.group == "net.java.dev.jna") { | ||
| useVersion(jnaVersion) | ||
| because("overridden by ant build") | ||
| } | ||
| if (requested.group == "org.graalvm") { | ||
| useVersion(graalvmVersion) | ||
| because("overridden by ant build") | ||
| } | ||
| } | ||
| } |
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