Example of extracting a jar file from java

gistfile1.java

log.debug("Started extracting resources.");

final String ZIP_FILE_PATH_SEPARATOR = "/";
URL location = AClassFromTheNeededJar.class.getProtectionDomain().getCodeSource()
        .getLocation();
String jarPath = location.getPath();

try {
    JarInputStream jar = new JarInputStream(new FileInputStream(jarPath));
    JarEntry jarEntry = null;
    
    while ((jarEntry = jar.getNextJarEntry()) != null) {
        String jarEntryName = jarEntry.getName();
        File entry = new File(dir, jarEntryName);
        
        if (jarEntryName.endsWith(ZIP_FILE_PATH_SEPARATOR))
        {
            entry.mkdirs();
        }
        else {
            entry.createNewFile();
            
            FileOutputStream out = new FileOutputStream(entry);
            byte[] buffer = new byte[1024];
            int readCount = 0;
            
            while ((readCount = jar.read(buffer)) >= 0) {
                out.write(buffer, 0, readCount);
            }
            
            jar.closeEntry();
            out.flush();
            out.close();
        }
        
        log.debug("File or directory has been extracted to {}",
                entry.getAbsolutePath());
    }
    
    jar.close();
}
catch (FileNotFoundException e) {
    throw new AnacondaException("SDG Initialization Failed:", e);
}
catch (IOException e) {
    throw new AnacondaException("SDG Initialization Failed:", e);
}

log.debug("Finished extracting resources.");