Remove JNA from native access (elastic#112977)

Now that main has a minimum compile version of Java 21, native access no
longer needs JNA. This commit removes JNA as a dependency, and moves the
jdk implementation into the main source set. It also slightly adjusts
the Mrjar plugin so that the main source set also supports preview
features, like the other numbered source sets.

Author: rjernst

build-tools-internal/src/main/java/org/elasticsearch/gradle/internal/MrjarPlugin.java

@@ -22,7 +22,9 @@
 import org.gradle.api.tasks.SourceSetContainer;
 import org.gradle.api.tasks.compile.CompileOptions;
 import org.gradle.api.tasks.compile.JavaCompile;
+import org.gradle.api.tasks.javadoc.Javadoc;
 import org.gradle.api.tasks.testing.Test;
+import org.gradle.external.javadoc.CoreJavadocOptions;
 import org.gradle.jvm.tasks.Jar;
 import org.gradle.jvm.toolchain.JavaLanguageVersion;
 import org.gradle.jvm.toolchain.JavaToolchainService;
@@ -73,8 +75,10 @@ public void apply(Project project) {
             List<Integer> mainVersions = findSourceVersions(project);
             List<String> mainSourceSets = new ArrayList<>();
             mainSourceSets.add(SourceSet.MAIN_SOURCE_SET_NAME);
+            configurePreviewFeatures(project, javaExtension.getSourceSets().getByName(SourceSet.MAIN_SOURCE_SET_NAME), 21);
             List<String> testSourceSets = new ArrayList<>(mainSourceSets);
             testSourceSets.add(SourceSet.TEST_SOURCE_SET_NAME);
+            configurePreviewFeatures(project, javaExtension.getSourceSets().getByName(SourceSet.TEST_SOURCE_SET_NAME), 21);
             for (int javaVersion : mainVersions) {
                 String mainSourceSetName = SourceSet.MAIN_SOURCE_SET_NAME + javaVersion;
                 SourceSet mainSourceSet = addSourceSet(project, javaExtension, mainSourceSetName, mainSourceSets, javaVersion);
@@ -124,11 +128,8 @@ private SourceSet addSourceSet(
             compileTask.setSourceCompatibility(Integer.toString(javaVersion));
             CompileOptions compileOptions = compileTask.getOptions();
             compileOptions.getRelease().set(javaVersion);
-            compileOptions.getCompilerArgs().add("--enable-preview");
-            compileOptions.getCompilerArgs().add("-Xlint:-preview");
-
-            compileTask.doLast(t -> { stripPreviewFromFiles(compileTask.getDestinationDirectory().getAsFile().get().toPath()); });
         });
+        configurePreviewFeatures(project, sourceSet, javaVersion);
 
         // Since we configure MRJAR sourcesets to allow preview apis, class signatures for those
         // apis are not known by forbidden apis, so we must ignore all missing classes. We could, in theory,
@@ -142,6 +143,21 @@ private SourceSet addSourceSet(
         return sourceSet;
     }
 
+    private void configurePreviewFeatures(Project project, SourceSet sourceSet, int javaVersion) {
+        project.getTasks().withType(JavaCompile.class).named(sourceSet.getCompileJavaTaskName()).configure(compileTask -> {
+            CompileOptions compileOptions = compileTask.getOptions();
+            compileOptions.getCompilerArgs().add("--enable-preview");
+            compileOptions.getCompilerArgs().add("-Xlint:-preview");
+
+            compileTask.doLast(t -> { stripPreviewFromFiles(compileTask.getDestinationDirectory().getAsFile().get().toPath()); });
+        });
+        project.getTasks().withType(Javadoc.class).named(name -> name.equals(sourceSet.getJavadocTaskName())).configureEach(javadocTask -> {
+            CoreJavadocOptions options = (CoreJavadocOptions) javadocTask.getOptions();
+            options.addBooleanOption("-enable-preview", true);
+            options.addStringOption("-release", String.valueOf(javaVersion));
+        });
+    }
+
     private void configureSourceSetInJar(Project project, SourceSet sourceSet, int javaVersion) {
         var jarTask = project.getTasks().withType(Jar.class).named(JavaPlugin.JAR_TASK_NAME);
         jarTask.configure(task -> task.into("META-INF/versions/" + javaVersion, copySpec -> copySpec.from(sourceSet.getOutput())));

libs/native/build.gradle

@@ -12,11 +12,6 @@ import org.elasticsearch.gradle.internal.precommit.CheckForbiddenApisTask
 apply plugin: 'elasticsearch.publish'
 apply plugin: 'elasticsearch.build'
 apply plugin: 'elasticsearch.mrjar'
-apply plugin: 'elasticsearch.embedded-providers'
-
-embeddedProviders {
-  impl 'native-access-jna', project(':libs:elasticsearch-native:jna')
-}
 
 dependencies {
   api project(':libs:elasticsearch-core')