import java.util.Map;
import java.util.Collections;

import java.util.jar.Attributes;
import java.util.jar.Manifest;
import java.util.jar.JarOutputStream;

import java.util.zip.ZipEntry;

import java.net.URI;

import java.io.BufferedOutputStream;
import java.io.IOException;

import java.nio.charset.StandardCharsets;

import java.nio.file.Files;
import java.nio.file.FileSystem;
import java.nio.file.FileSystems;
import java.nio.file.Path;

public class JarPathTest2 {
    public static void main(String[] args)
    throws IOException {

        Path jar = Files.createTempFile("path with spaces", ".jar");

        Manifest manifest = new Manifest();
        manifest.getMainAttributes().put(Attributes.Name.MANIFEST_VERSION,
                                         "1.0");

        try (JarOutputStream jarStream = new JarOutputStream(
            new BufferedOutputStream(Files.newOutputStream(jar)),
            manifest)) {

            ZipEntry entry;

            entry = new ZipEntry("file1.txt");
            jarStream.putNextEntry(entry);
            jarStream.write("Hello".getBytes(StandardCharsets.US_ASCII));
            jarStream.closeEntry();

            entry = new ZipEntry("file2.txt");
            jarStream.putNextEntry(entry);
            jarStream.write("world".getBytes(StandardCharsets.US_ASCII));
            jarStream.closeEntry();
        }

        URI zipURI = URI.create("jar:" + jar.toUri());
        System.out.println(zipURI);

        Map<String, String> env = Collections.emptyMap();

        try (FileSystem fs = FileSystems.newFileSystem(zipURI, env)) {
            Path root = fs.getPath("/");
            URI uri = root.toUri();
            System.out.println(uri);
        }

        Files.delete(jar);
    }
}