Descomprimir un archivo con Java

[pierxo]

Tengo un problema al descomprimir un archivo .RAR con java. Estoy utilizando Junrar para poder hacerlo pero me sale este error.

java.lang.NullPointerException
at de.innosystec.unrar.Archive.readHeaders(Archive.ja va:234)
at de.innosystec.unrar.Archive.setFile(Archive.java:1 24)
at de.innosystec.unrar.Archive.<init>(Archive.java:10 8)
at de.innosystec.unrar.Archive.<init>(Archive.java:96 )
at Main.extractArchive(Main.java:71)
at Main.extractArchive(Main.java:39)
at Main.main(Main.java:58)

Exception in thread "main" java.lang.NullPointerException: mainheader is null
at de.innosystec.unrar.Archive.isEncrypted(Archive.ja va:194)
at Main.extractArchive(Main.java:78)
at Main.extractArchive(Main.java:39)
at Main.main(Main.java:58)


Este es mi codigo:


import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.OutputStream;
import java.util.zip.ZipEntry;

import javax.swing.JPopupMenu.Separator;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import de.innosystec.unrar.Archive;
import de.innosystec.unrar.exception.RarException;
import de.innosystec.unrar.rarfile.FileHeader;


public class Main {
public boolean accept(File dir, String extension) {
return dir.getName().endsWith(extension);
}

private static Log logger = LogFactory.getLog(Main.class
.getName());

public static void extractArchive(String archive, String destination) {
if (archive == null || destination == null) {
throw new RuntimeException("archivo y destino deben setearse");
}
File arch = new File(archive);
if (!arch.exists()) {
throw new RuntimeException("el archivo no existe: " + archive);
}
File dest = new File(destination);
if (!dest.exists() || !dest.isDirectory()) {
throw new RuntimeException(
"El destino debe existir y apuntar a un directorio: "
+ destination);
}
extractArchive(arch, dest);
}

public static void main(String[] args) {
if (args.length == 2) {
String path = "D:/dir";
File fi = new File(path);

// File[] listaObjetos = fi.listFiles();
// for (int i = 0; i < listaObjetos.length; i++) {
// if (new Main().accept(listaObjetos[i], ".pdf.cxsig")) {
// String res = listaObjetos[i].getPath();
// String file = res.substring(res.lastIndexOf('/') + 1, res.lastIndexOf('.')-4);
// File re = new File(file.concat(".rar"));
// listaObjetos[i].renameTo(re);
//
// System.out.println("Se encontro archivos rar: " + listaObjetos[i].getPath() + file);
// }
// }
extractArchive(args[0], args[1]);
} else {
System.out
.println("use: java -jar NombreJAR.jar <Origen> <Destino>");
}


}

public static void extractArchive(File archive, File destination) {

Archive arch = null;
try {
arch = new Archive(archive);
} catch (RarException e) {
logger.error(e);
} catch (IOException e1) {
logger.error(e1);
}
if (arch != null) {
if (arch.isEncrypted()) {
logger.warn("archive is encrypted cannot extreact");
return;
}
FileHeader fh = null;
while (true) {
fh = arch.nextFileHeader();
if (fh == null) {
break;
}
// if (fh.isEncrypted()) {
// logger.warn("file is encrypted cannot extract: "
// + fh.getFileNameString());
// continue;
// }
logger.info("extracting: " + fh.getFileNameString());
try {
if (fh.isDirectory()) {
createDirectory(fh, destination);
} else {
File f = createFile(fh, destination);
OutputStream stream = new FileOutputStream(f);
arch.extractFile(fh, stream);
stream.close();
}
} catch (IOException e) {
logger.error("error extracting the file", e);
} catch (RarException e) {
logger.error("error extraction the file", e);
}
}
}
}

private static File createFile(FileHeader fh, File destination) {
File f = null;
String name = null;
if (fh.isFileHeader() && fh.isUnicode()) {
name = fh.getFileNameW();
} else {
name = fh.getFileNameString();
}
f = new File(destination, name);
if (!f.exists()) {
try {
f = makeFile(destination, name);
} catch (IOException e) {
logger.error("error creating the new file: " + f.getName(), e);
}
}
return f;
}

private static File makeFile(File destination, String name)
throws IOException {
String[] dirs = name.split("\\\\");
if (dirs == null) {
return null;
}
String path = "";
int size = dirs.length;
if (size == 1) {
return new File(destination, name);
} else if (size > 1) {
for (int i = 0; i < dirs.length - 1; i++) {
path = path + File.separator + dirs[i];
new File(destination, path).mkdir();
}
path = path + File.separator + dirs[dirs.length - 1];
File f = new File(destination, path);
f.createNewFile();
return f;
} else {
return null;
}
}


private static void createDirectory(FileHeader fh, File destination) {
File f = null;
if (fh.isDirectory() && fh.isUnicode()) {
f = new File(destination, fh.getFileNameW());
if (!f.exists()) {
makeDirectory(destination, fh.getFileNameW());
}
} else if (fh.isDirectory() && !fh.isUnicode()) {
f = new File(destination, fh.getFileNameString());
if (!f.exists()) {
makeDirectory(destination, fh.getFileNameString());
}
}
}

private static void makeDirectory(File destination, String fileName) {
String[] dirs = fileName.split("\\\\");
if (dirs == null) {
return;
}
String path = "";
for (String dir : dirs) {
path = path + File.separator + dir;
new File(destination, path).mkdir();
}

}

public static boolean esPDF(ZipEntry arch){
if(arch.getName().endsWith("pdf"))
return true;
return false;
}
}

Si alguien podria ayudarme.

El nombre de mi .rar es sample95.pdf.rar. Orginial mente era sample95.pdf.cxsig

le cambio la ultima extension por un .rar he intente descomprimirlo

Gracias