test/langtools/tools/javac/T6942649.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
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 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
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 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 */

/*
 * @test
 * @bug 6942649
 * @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("MD5 checksum: "))
            throw new Exception("checksum not found in output");
    }
}