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Various utility classes. Except for very rare exceptions (annotation-based validation) this will not require any dependencies beyond the JRE

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package com.aeontronix.commons;

import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.nio.file.FileVisitResult;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.SimpleFileVisitor;
import java.nio.file.attribute.BasicFileAttributes;
import java.util.zip.ZipEntry;
import java.util.zip.ZipOutputStream;

public class ArchiveUtils {
    public static void zipDir(String dir, File zipFile) throws IOException {
        zipDir(new File(dir), zipFile);
    }

    public static void zipDir(File dir, File zipFile) throws IOException {
        final Path sourceDir = dir.toPath();
        try (ZipOutputStream outputStream = new ZipOutputStream(new FileOutputStream(zipFile))) {
            Files.walkFileTree(sourceDir, new SimpleFileVisitor() {
                @Override
                public FileVisitResult visitFile(Path file, BasicFileAttributes attributes) throws IOException {
                    Path targetFile = sourceDir.relativize(file);
                    outputStream.putNextEntry(new ZipEntry(targetFile.toString()));
                    byte[] bytes = Files.readAllBytes(file);
                    outputStream.write(bytes, 0, bytes.length);
                    outputStream.closeEntry();
                    return FileVisitResult.CONTINUE;
                }
            });
        }
    }
}