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ProGuard is a free shrinker, optimizer, obfuscator, and preverifier for Java bytecode
There is a newer version: 7.6.0
/*
 * ProGuard -- shrinking, optimization, obfuscation, and preverification
 *             of Java bytecode.
 *
 * Copyright (c) 2002-2020 Guardsquare NV
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; either version 2 of the License, or (at your option)
 * any later version.
 *
 * This program 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 for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
 */
package proguard;

import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import proguard.classfile.visitor.*;
import proguard.optimize.*;
import proguard.pass.Pass;
import proguard.util.PrintWriterUtil;

import java.io.*;

/**
 * This pass prints out the seeds specified by keep options.
 *
 * @author Eric Lafortune
 */
public class SeedPrinter implements Pass
{
    private static final Logger logger = LogManager.getLogger(SeedPrinter.class);

    private final Configuration configuration;

    public SeedPrinter(Configuration configuration)
    {
        this.configuration = configuration;
    }


    /**
     * Prints out the seeds for the classes in the given program class pool.
     *
     * @throws IOException if an IO error occurs while writing the configuration.
     */
    @Override
    public void execute(AppView appView) throws IOException
    {
        logger.info("Printing kept classes, fields, and methods...");

        PrintWriter printWriter = PrintWriterUtil.createPrintWriterOut(configuration.printSeeds);

        try
        {
            // Check if we have at least some keep commands.
            if (configuration.keep == null)
            {
                throw new IOException("You have to specify '-keep' options if you want to write out kept elements with '-printseeds'.");
            }

            // Clean up any old processing info.
            appView.programClassPool.classesAccept(new ClassCleaner());
            appView.libraryClassPool.classesAccept(new ClassCleaner());

            // Create a visitor for printing out the seeds. We're  printing out
            // the program elements that are preserved against shrinking,
            // optimization, or obfuscation.
            KeepMarker keepMarker = new KeepMarker();
            ClassPoolVisitor classPoolvisitor =
                    new KeepClassSpecificationVisitorFactory(true, true, true)
                        .createClassPoolVisitor(configuration.keep,
                                                keepMarker,
                                                keepMarker,
                                                keepMarker,
                                                null);

            // Mark the seeds.
            appView.programClassPool.accept(classPoolvisitor);
            appView.libraryClassPool.accept(classPoolvisitor);

            // Print out the seeds.
            SimpleClassPrinter printer = new SimpleClassPrinter(false, printWriter);
            appView.programClassPool.classesAcceptAlphabetically(
                new MultiClassVisitor(
                    new KeptClassFilter(printer),
                    new AllMemberVisitor(new KeptMemberFilter(printer))
                ));
        }
        finally
        {
            PrintWriterUtil.closePrintWriter(configuration.printSeeds, printWriter);
        }
    }
}