test/langtools/tools/javac/fatalErrors/NoJavaLangTest.java

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/*
 * @test
 * @bug 4263768 4785453 8205187
 * @summary Verify that the compiler does not crash when java.lang is not available
 * @library /tools/lib
 * @modules jdk.compiler/com.sun.tools.javac.api
 *          jdk.compiler/com.sun.tools.javac.main
 * @build toolbox.ToolBox toolbox.JavacTask
 * @run main NoJavaLangTest
 */

import java.nio.file.*;

import toolbox.JavacTask;
import toolbox.Task;
import toolbox.ToolBox;

public class NoJavaLangTest  {

    private static final String noJavaLangSrc =
        "public class NoJavaLang {\n" +
        "    private String s;\n" +
        "\n" +
        "    public String s() {\n" +
        "        return s;\n" +
        "    }\n" +
        "}";

    private static final String compilerErrorMessage =
        "error: Unable to find package java.lang in platform classes";

    public static void main(String[] args) throws Exception {
        new NoJavaLangTest().run();
    }

    final ToolBox tb = new ToolBox();

    void run() throws Exception {
        testStandard();
        testBootClassPath();
        testModulePath();
    }

    // sanity check, with java.lang available
    void testStandard() {
        new JavacTask(tb)
                .sources(noJavaLangSrc)
                .run();
    }


    // test with bootclasspath, for as long as its around
    void testBootClassPath() {
        String[] bcpOpts = { "-Xlint:-options", "-source", "8", "-bootclasspath", ".", "-classpath", "." };
        test(bcpOpts, compilerErrorMessage);
    }

    // test with module path
    void testModulePath() throws Exception {
        // need to ensure there is an empty java.base to avoid different error message
        Files.createDirectories(Paths.get("modules/java.base"));
        new JavacTask(tb)
                .sources("module java.base { }",
                         "package java.lang; public class Object {}")
                .outdir("modules/java.base")
                .run();

        Files.delete(Paths.get("modules", "java.base", "java", "lang", "Object.class"));

        String[] mpOpts = { "--system", "none", "--module-path", "modules" };
        test(mpOpts, compilerErrorMessage);
    }

    private void test(String[] options, String expect) {
        System.err.println("Testing " + java.util.Arrays.toString(options));

        String out = new JavacTask(tb)
                .options(options)
                .sources(noJavaLangSrc)
                .run(Task.Expect.FAIL, 1)
                .writeAll()
                .getOutput(Task.OutputKind.DIRECT);

        if (!out.trim().startsWith(expect)) {
            throw new AssertionError("javac generated error output is not correct");
        }
    }

}