Native extension to unzip a file crash my air app

Hello,

I have a problem with a native extension for android

I want to unzip a file

my java code

File f = new File("my zip file");
File outputDir = new File ("output folder");
ZipHelper.unzip(f, outputDir);

and

import java.util.zip.*;import java.io.*;import java.util.Enumeration;import org.apache.commons.io.IOUtils;import android.util.Log;  publicclass ZipHelper{staticpublicvoid unzip(File archive, File outputDir){try{
Log.d("control","ZipHelper.unzip() - File: " + archive.getPath());
ZipFile zipfile = new ZipFile(archive);for (Enumeration e = zipfile.entries(); e.hasMoreElements(); ) {
ZipEntry entry = (ZipEntry) e.nextElement();
unzipEntry(zipfile, entry, outputDir);}}catch (Exception e) {
Log.d("control","ZipHelper.unzip() - Error extracting file " + archive+": "+ e);}}  staticprivatevoid unzipEntry(ZipFile zipfile, ZipEntry entry, File outputDir) throws IOException{if (entry.isDirectory()) {
createDirectory(new File(outputDir, entry.getName()));return;}  
File outputFile = new File(outputDir, entry.getName());if (!outputFile.getParentFile().exists()){
createDirectory(outputFile.getParentFile());}  
Log.d("control","ZipHelper.unzipEntry() - Extracting: " + entry);
BufferedInputStream inputStream = new BufferedInputStream(zipfile.getInputStream(entry));
BufferedOutputStream outputStream = new BufferedOutputStream(new FileOutputStream(outputFile));  try{
IOUtils.copy(inputStream, outputStream);}catch (Exception e) {
Log.d("control","ZipHelper.unzipEntry() - Error: " + e);}finally{
outputStream.close();
inputStream.close();}}  staticprivatevoid createDirectory(File dir){
Log.d("control","ZipHelper.createDir() - Creating directory: "+dir.getName());if (!dir.exists()){if(!dir.mkdirs()) thrownew RuntimeException("Can't create directory "+dir);}else Log.d("control","ZipHelper.createDir() - Exists directory: "+dir.getName());}}

i copy the file commons-io-2.4.jar (I get at http://commons.apache.org/proper/commons-io/download_io.cgi) in the lib folder of eclipse.

in a native android app, this code work fine

in a native extension for air, my air app crash

LogCat in eclipse return

NoClassDefFoundError: org.apache.comons.io.IOUtils.copy

IOUtils class is not in commons-io-2.4.jar ???

thanks