RemoveJar.java

/*
 * Copyright (c) 2019, 2021, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * 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).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

/*
 * @test
 * @bug 8264048
 *
 * @run main/othervm RemoveJar true true testpkg.Test testpkg.Test testjar/
 * @run main/othervm RemoveJar true true testpkg.Test testpkg.Missing testjar/
 * @run main/othervm RemoveJar true true testpkg.Missing testpkg.Test testjar/
 * @run main/othervm RemoveJar true true testpkg.Missing testpkg.Missing testjar/
 *
 * @run main/othervm RemoveJar true false testpkg.Test testpkg.Test testjar/
 * @run main/othervm RemoveJar true false testpkg.Test testpkg.Missing testjar/
 * @run main/othervm RemoveJar true false testpkg.Missing testpkg.Test testjar/
 * @run main/othervm RemoveJar true false testpkg.Missing testpkg.Missing testjar/
 *
 * @run main/othervm RemoveJar false true testpkg.Test testpkg.Test testjar/
 * @run main/othervm RemoveJar false true testpkg.Test testpkg.Missing testjar/
 * @run main/othervm RemoveJar false true testpkg.Missing testpkg.Test testjar/
 * @run main/othervm RemoveJar false true testpkg.Missing testpkg.Missing testjar/
 *
 * @run main/othervm RemoveJar false false testpkg.Test testpkg.Test testjar/
 * @run main/othervm RemoveJar false false testpkg.Test testpkg.Missing testjar/
 * @run main/othervm RemoveJar false false testpkg.Missing testpkg.Test testjar/
 * @run main/othervm RemoveJar false false testpkg.Missing testpkg.Missing testjar/
 *
 * @run main/othervm RemoveJar true true testpkg.Test testpkg.Test badpath
 *
 * @summary URLClassLoader.close() doesn't close cached JAR file on Windows when load() fails
 */

import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.PrintStream;
import java.io.UncheckedIOException;
import java.net.URL;
import java.net.URLClassLoader;
import java.net.URLConnection;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.Arrays;
import java.util.stream.Stream;
import java.util.zip.ZipException;
import java.util.spi.ToolProvider;

public class RemoveJar {
    private final static String TEST_PKG = "testpkg";
    private final static String JAR_DIR = "testjar/" + TEST_PKG;
    private final static String FILE_NAME = "testjar.jar";
    private final static ByteArrayOutputStream baos = new ByteArrayOutputStream();
    private final static PrintStream out = new PrintStream(baos);
    private final static ToolProvider JAR_TOOL = ToolProvider.findFirst("jar")
            .orElseThrow(() ->
                    new RuntimeException("jar tool not found")
            );

    private static void buildJar() throws IOException {
        // create dir
        mkdir(JAR_DIR);
        // create file
        Path path = Paths.get(JAR_DIR);
        String src = "package " + TEST_PKG + ";\n" +
                "class Test {}\n";
        Files.write(Paths.get(JAR_DIR + "/Test.java"), src.getBytes());
        // compile class
        compile(JAR_DIR + "/Test.java");
        // package jar
        jar("-cf testjar.jar " + JAR_DIR);
    }

    public static void main(String args[]) throws Exception {
        buildJar();

        URLClassLoader loader = null;
        URL url = null;
        Path path = Paths.get(FILE_NAME);

        boolean useCacheFirst = Boolean.parseBoolean(args[0]);
        boolean useCacheSecond = Boolean.parseBoolean(args[1]);
        String firstClass = args[2];
        String secondClass = args[3];
        String subPath = args[4];

        try {
            String path_str = path.toUri().toURL().toString();
            URLConnection.setDefaultUseCaches("jar", useCacheFirst);

            url = new URL("jar", "", path_str + "!/" + subPath);
            loader = new URLClassLoader(new URL[]{url});

            loader.loadClass(firstClass);
        } catch (Exception e) {
            System.err.println("EXCEPTION: " + e);
        }

        try {
            URLConnection.setDefaultUseCaches("jar", useCacheSecond);
            loader.loadClass(secondClass);
        } catch (Exception e) {
            System.err.println("EXCEPTION: " + e);
        } finally {
            loader.close();
            Files.delete(path);
        }
    }

    private static Stream<Path> mkpath(String... args) {
        return Arrays.stream(args).map(d -> Paths.get(".", d.split("/")));
    }

    private static void mkdir(String cmdline) {
        System.out.println("mkdir -p " + cmdline);
        mkpath(cmdline.split(" +")).forEach(p -> {
            try {
                Files.createDirectories(p);
            } catch (IOException x) {
                throw new UncheckedIOException(x);
            }
        });
    }

    private static void jar(String cmdline) throws IOException {
        System.out.println("jar " + cmdline);
        baos.reset();

        // the run method catches IOExceptions, we need to expose them
        ByteArrayOutputStream baes = new ByteArrayOutputStream();
        PrintStream err = new PrintStream(baes);
        PrintStream saveErr = System.err;
        System.setErr(err);
        int rc = JAR_TOOL.run(out, err, cmdline.split(" +"));
        System.setErr(saveErr);
        if (rc != 0) {
            String s = baes.toString();
            if (s.startsWith("java.util.zip.ZipException: duplicate entry: ")) {
                throw new ZipException(s);
            }
            throw new IOException(s);
        }
    }

    /* run javac <args> */
    private static void compile(String... args) {
        if (com.sun.tools.javac.Main.compile(args) != 0) {
            throw new RuntimeException("javac failed: args=" + Arrays.toString(args));
        }
    }
}