jdk-24/test/langtools/tools/javac/T6942649.java

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/*
 * @test
 * @bug 6942649 8225748
 * @summary add hidden option to identify location and version of javac classes
 * @modules jdk.compiler
 */

import java.io.*;

public class T6942649 {
    public static void main(String... args) throws Exception {
        new T6942649().run();
    }

    void run() throws Exception {
        test("-XDshowClass", "com.sun.tools.javac.Main", false);
        test("-XDshowClass=com.sun.tools.javac.util.Log", "com.sun.tools.javac.util.Log", false);
    }

    void test(String opt, String clazz, boolean checkLocation) throws Exception {
        System.err.println("test " + opt);
        StringWriter sw = new StringWriter();
        PrintWriter pw = new PrintWriter(sw);
        int rc = com.sun.tools.javac.Main.compile(new String[] { opt }, pw);
        pw.close();
        String out = sw.toString();
        System.err.println("javac rc=" + rc + "\n" + out);

        if (!out.contains(clazz))
            throw new Exception("class name not found in output");

        // (JDK 9) We can no longer guarantee to be able to show a URL for the
        // location of the class, especially when the class is in the system image
        if (checkLocation) {
            int lastDot = clazz.lastIndexOf(".");
            if (!out.contains(clazz.substring(lastDot + 1) + ".class"))
                throw new Exception("location of class not found in output");
        }

        if (!out.contains("SHA-256 checksum: "))
            throw new Exception("checksum not found in output");
    }
}