Java code: Simple RSA encryption and decryption code

A simple program to generate 1024 bit RSA key pair, and perform simple encryption and decryption. No a big deal. Two classes: AsymetricKeyHelper and Main. AsymmetricKeyHelper.java:

/*AsymmetricKeyHelper.java*/
package com.work.crypto;

import java.security.InvalidKeyException;
import java.security.Key;
import java.security.KeyPair;
import java.security.KeyPairGenerator;
import java.security.NoSuchAlgorithmException;
import java.security.PrivateKey;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

public class AsymmetricKeyHelper {

 //Generates an RSA public private key pair
 public KeyPair keyPair() {
  KeyPair kp = null;
  try {
   KeyPairGenerator keyPairGenerator = KeyPairGenerator
     .getInstance("RSA");
   keyPairGenerator.initialize(1024);
   kp = keyPairGenerator.generateKeyPair();

  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  }
  return kp;
 }

 //does the encryption
 public byte[] encrypt(byte[] clearTest, Key key) {
  try {
   Cipher cipher = Cipher.getInstance(key.getAlgorithm());
   cipher.init(Cipher.ENCRYPT_MODE, key);
   return cipher.doFinal(clearTest);
  } catch (InvalidKeyException e) {
   e.printStackTrace();
  } catch (NoSuchAlgorithmException e) {
   e.printStackTrace();
  } catch (NoSuchPaddingException e) {
   e.printStackTrace();
  } catch (IllegalBlockSizeException e) {
   e.printStackTrace();
  } catch (BadPaddingException e) {
   e.printStackTrace();
  }
  return null;
 }

 //does the decryption
 public byte[] decrypt(byte[] cipherText, PrivateKey private1) {
  try {
   Cipher cipher;
   System.out.println(private1.getAlgorithm());
   cipher = Cipher.getInstance(private1.getAlgorithm());
   cipher.init(Cipher.DECRYPT_MODE, private1);
   return cipher.doFinal(cipherText);
  } catch (NoSuchAlgorithmException e1) {
   e1.printStackTrace();
  } catch (NoSuchPaddingException e1) {
   e1.printStackTrace();
  } catch (InvalidKeyException e) {
   e.printStackTrace();
  } catch (IllegalBlockSizeException e) {
   e.printStackTrace();
  } catch (BadPaddingException e) {
   e.printStackTrace();
  }

  return null;
 }

}

Main.java:

/*Main.java*/
package com.work.crypto;

import java.security.KeyPair;

public class Main {

 /**
  * @param args
  */
 public static void main(String[] args) {
  asymmetricEncryptionSimple();
 }

 private static void asymmetricEncryptionSimple() {
  AsymmetricKeyHelper keyHelper = new AsymmetricKeyHelper();
  KeyPair keyPair = keyHelper.keyPair();
  System.out.println(keyPair.getPublic().getAlgorithm());
    
  String plainText = "You little Monkey.I am a cryptographer";
  
  byte[] cipherText = keyHelper.encrypt(plainText.getBytes(), keyPair.getPublic());
  //Print the encrypted text, it is in binary. So it will look ugly.
  System.out.println(new String(cipherText));
  
  byte[] clearDecrypt = keyHelper.decrypt(cipherText, keyPair.getPrivate());
  //Create a string out of the byte array
  System.out.println(new String(clearDecrypt));
 }

}