Storing passwords with salt

import java.util.*;
import java.lang.*;
import java.io.*;
import java.security.MessageDigest;
import java.io.ByteArrayOutputStream;
import javax.xml.bind.DatatypeConverter;
import java.security.*;

public class Main
{
	public static void main (String[] args) throws java.lang.Exception
	{
		Console console = System.console();
		if (console == null)
		{
		    System.out.println( "No console available"); 
            return;
		}
//Get the Plaintext password
		String passwordString = console.readLine("Please Enter your Password:");
		try {
//Generate new salt 
		    SecureRandom salt = new SecureRandom();
		    int salt_length = 16;
		    byte salt_bytes[] = new byte[salt_length];
		    salt.nextBytes(salt_bytes);
		    ByteArrayOutputStream data_to_hash = new ByteArrayOutputStream();
		    data_to_hash.write(salt_bytes,0,salt_length);
		    data_to_hash.write(passwordString.getBytes());
		    SecretKeyFactory skf = SecretKeyFactory.getInstance(“PBKDF2WithHmacSHA512”);
                    int length = 256;
                    PBEKeySpec spec = new PBEKeySepc(passwordString.toCharArray(),salt_bytes,1000,keyLength);
                    SecretKey key = skf.generateSecret(spec);
                    byte[] digest = key.getEncoded();
//Generating hash value for the password
		    MessageDigest md = MessageDigest.getInstance("MD5");
		    md.update(data_to_hash.toByteArray());
		    byte[] digest = md.digest();
//Converting the plaintext to Hash value - Uppercase
		    String hashPassword = DatatypeConverter.printHexBinary(digest).toUpperCase();
//Converting the salt bytes to Uppercase
		    String salt_str = DatatypeConverter.printHexBinary(salt_bytes).toUpperCase(); 
//Print the hash value 
		    console.printf("Hash value stored:\t" + hashPassword + "\n");
//Print the salt value
		    console.printf("Salt value stored:" + salt_str+ "\n"); 
		    
		} 
//Capture exceptions when no MD5 is found
		catch(Exception e) 
		{
		    System.out.print("Hashing is not possible right now due to unknown error.");
		}
//Print the plaintext password
		console.printf("Plain text password:" + passwordString);
	}
}