java.lang.NoClassDefFoundError：org / apache / commons / codec / binary / Base64

Question

Admin please don't mark it as duplicate read my question completely. I am encrypting and decrypting some text but while running in same file with main its running fine but when i call its encrypt and decrypt function from outside. Its giving an error at runtime. I am attaching the code. package desede;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;

import javax.crypto.Cipher;
import javax.crypto.SecretKey;
import javax.crypto.spec.SecretKeySpec;

import org.apache.commons.codec.binary.Base64;

import security.SHA256Algo;
import shradhafinalwiddesign.UpdateFile;
import shradhafinalwiddesign.UserRegistration;

import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;

/**
 * Simple TripleDES Encrypt/Decrypt Test 
 * sha1, utf-8, no padding
 *
 * uses commons-codec-1.6 
 * javac -cp :commons-codec-1.6.jar TripleDESTest.java
 * java -cp :commons-codec-1.6.jar TripleDESTest 
 */

public class TripleDesDemo {


    public static void main(String[] args) throws Exception {

        String text = "textToEncrypt";
        UserRegistration user = new UserRegistration() ;
        user.setlUsername("tarunv") ;
        user.setAnswer("tommysdsfdsfsd") ;
        user.setLastaccess("pets namesdfsfds") ;
        user.setLpassword("computersdfdsfd") ;

        String h1 = SHA256Algo.createHash(user.getlUsername()) ;
        String h2 = SHA256Algo.createHash(user.getLpassword()) ;
        String h3 = SHA256Algo.createHash(user.getAnswer()) ;

        String hash1 = UpdateFile.modifyHashValue(h1).substring(0, 24) ;
        String hash2 = UpdateFile.modifyHashValue(h2) ;
        String hash3 = UpdateFile.modifyHashValue(h3) ;

        System.out.println("    key1 : "+hash1.length()+"    key2 : "+hash2.length()+"   key3 : "+hash3.length());
        byte[] arr = toByteArray(user) ;

        byte[] codedtext = TripleDesDemo._encrypt(arr,"tarunvermacdac@gmail.com");
        byte[] codedtext1 = TripleDesDemo._encrypt(codedtext,"tarun.spicyabc@gmail.com");
        byte[] codedtext2 = TripleDesDemo._encrypt(codedtext1,"direct_tarun@yahoo.co.in");

        writeSmallBinaryFile(codedtext2, "tarun.bat") ;
        byte[] texttoDecrypt = readSmallBinaryFile("tarun.bat");

        byte[] decodedtext = TripleDesDemo._decrypt(texttoDecrypt,"direct_tarun@yahoo.co.in");
        byte[] decodedtext1 = TripleDesDemo._decrypt(decodedtext,"tarun.spicyabc@gmail.com");
        byte[] decodedtext2 = TripleDesDemo._decrypt(decodedtext1,"tarunvermacdac@gmail.com");

        System.out.println(codedtext + " ---> " + toObject(decodedtext2));

      }


    public static byte[] _encrypt(byte[] plainTextBytes, String secretKey) throws Exception {

        byte[] keyBytes = secretKey.getBytes();

        SecretKey key = new SecretKeySpec(keyBytes, "DESede");
        Cipher cipher = Cipher.getInstance("DESede");
        cipher.init(Cipher.ENCRYPT_MODE, key);

        //byte[] plainTextBytes = message.getBytes("utf-8");
        byte[] buf = cipher.doFinal(plainTextBytes);
        byte [] base64Bytes = Base64.encodeBase64(buf);
        //String base64EncryptedString = new String(base64Bytes);

        return base64Bytes ;
    }

    public static byte[] _decrypt(byte[] encryptedText, String secretKey) throws Exception {

        //byte[] message = Base64.decodeBase64(encryptedText);
        byte[] message = Base64.decodeBase64(encryptedText);
        byte[] keyBytes = secretKey.getBytes();
        SecretKey key = new SecretKeySpec(keyBytes, "DESede");

        Cipher decipher = Cipher.getInstance("DESede");
        decipher.init(Cipher.DECRYPT_MODE, key);

        byte[] plainText = decipher.doFinal(message);
        return plainText ;
        //return toObject(plainText);
    }

    public static byte[] toByteArray(UserRegistration obj) throws IOException {
        byte[] bytes = null;
        ByteArrayOutputStream bos = null;
        ObjectOutputStream oos = null;
        try {
            bos = new ByteArrayOutputStream();
            oos = new ObjectOutputStream(bos);
            oos.writeObject(obj);
            oos.flush();
            bytes = bos.toByteArray();
        } finally {
            if (oos != null) {
                oos.close();
            }
            if (bos != null) {
                bos.close();
            }
        }
        return bytes;
    }

    public static UserRegistration toObject(byte[] bytes) throws IOException, ClassNotFoundException {
        UserRegistration obj = null;
        ByteArrayInputStream bis = null;
        ObjectInputStream ois = null;
        try {
            bis = new ByteArrayInputStream(bytes);
            ois = new ObjectInputStream(bis);
            obj = (UserRegistration) ois.readObject();
        } finally {
            if (bis != null) {
                bis.close();
            }
            if (ois != null) {
                ois.close();
            }
        }
        return obj;
    }

    public static byte[] readSmallBinaryFile(String aFileName) throws IOException {
        Path path = Paths.get(aFileName);
        return Files.readAllBytes(path);
    }

    public static void writeSmallBinaryFile(byte[] aBytes, String aFileName) throws IOException {
        Path path = Paths.get(aFileName);
        Files.write(path, aBytes); //creates, overwrites
    }
}

The code is running fine with main but not when i call its function from other class which is in other package. Here is the exception.

Exception in thread "AWT-EventQueue-0" java.lang.NoClassDefFoundError: org/apache/commons/codec/binary/Base64   at desede.TripleDesAlgo._encrypt(TripleDesAlgo.java:81)

And this is .classpath file Thanks in advance for any help.

Answer 1

You are missing commons-codec.jar. Download it from http://commons.apache.org/proper/commons-codec/download_codec.cgi . Then add it project build path. To do that right click the project, click Properties, click "Java Build Path", open "Library" tab, and click "Add External JARs...".

Or if you are using maven add dependency for

<dependency>
    <groupId>commons-codec</groupId>
    <artifactId>commons-codec</artifactId>
    <version>1.6</version>
</dependency>