test/langtools/tools/javac/api/TestModuleUnnamedPackage.java

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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug     8234025
 * @summary Elements.getPackageElement(ModuleElement,CharSequence) returns null for unnamed package
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.main
 * @library /tools/lib /tools/javac/lib
 * @build toolbox.ModuleBuilder toolbox.ToolBox
 * @run main TestModuleUnnamedPackage
 */

import java.io.IOException;
import java.nio.file.Path;
import java.util.List;
import java.util.Set;

import javax.annotation.processing.RoundEnvironment;
import javax.lang.model.element.ModuleElement;
import javax.lang.model.element.PackageElement;
import javax.lang.model.element.TypeElement;
import javax.lang.model.util.Elements;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.StandardLocation;
import javax.tools.ToolProvider;

import com.sun.source.util.JavacTask;
import toolbox.Assert;
import toolbox.ToolBox;

public class TestModuleUnnamedPackage extends JavacTestingAbstractProcessor {
    public static void main(String... args) throws IOException {
        TestModuleUnnamedPackage t = new TestModuleUnnamedPackage();
            t.run();
    }

    void run() throws IOException {
        ToolBox tb = new ToolBox();
        Path src = Path.of("src");

        tb.writeJavaFiles(src, "module m { exports p; }",
                "package p; public class C { }");

        JavaCompiler c = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager fm = c.getStandardFileManager(null, null, null);
        fm.setLocationFromPaths(StandardLocation.SOURCE_PATH, List.of(src));
        List<String> options = List.of("-proc:only");
        Iterable<? extends JavaFileObject> files = fm.getJavaFileObjects(tb.findJavaFiles(src));
        JavacTask t = (JavacTask) c.getTask(null, fm, null, null, null, files);
        t.setProcessors(List.of(this));
        t.call();
    }

    public boolean process(Set<? extends TypeElement> elems, RoundEnvironment rEnv) {
        if (rEnv.processingOver()) {
            Elements elements = processingEnv.getElementUtils();
            ModuleElement m = elements.getModuleElement("m");
            PackageElement unnamed = elements.getPackageElement(m, "");
            System.out.println("module m: " + m);
            System.out.println("module m, unnamed package: " + unnamed);
            Assert.checkNonNull(unnamed, "unnamed package in module m");
        }
        return true;
    }
}