test/jdk/java/nio/file/Files/CopyToNonDefaultFS.java

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/**
 * @test
 * @bug 8245194
 * @run main/othervm CopyToNonDefaultFS
 * @summary Test for exception copying from default to non-default file system
 */

import java.io.*;
import java.nio.ByteBuffer;
import java.nio.channels.*;
import java.nio.file.*;
import java.util.*;

import static java.nio.file.StandardOpenOption.*;

public class CopyToNonDefaultFS {
    public static void main(String... args) throws IOException {
        Path source = Files.createTempFile(Path.of("."), "tmp", ".dat");
        try (FileChannel fc = FileChannel.open(source, CREATE, WRITE)) {
            fc.position(8191);
            fc.write(ByteBuffer.wrap(new byte[] {27}));
        }

        Path zip = Path.of("out.zip");
        zip.toFile().deleteOnExit();
        Map<String,String> env =
            Map.of("create", String.valueOf(Files.notExists(zip)));

        ClassLoader cl = CopyToNonDefaultFS.class.getClassLoader();
        try (FileSystem fileSystem = FileSystems.newFileSystem(zip, env, cl)) {
            Path p = fileSystem.getPath(source.getFileName().toString());
            Files.copy(source, p);
        }
    }
}