Failed to copy "My Documents" in Java

I am trying to copy files, folders, subfolders, zip files, etc. from a given location to another location. I used the code below.

import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;

public class CopyDirectoryExample
{
    public static void main(String[] args)
    {   
        File srcFolder = new File("C:\\Users\\Yohan\\Documents");
        File destFolder = new File("D:\\Test");

        //make sure source exists
        if(!srcFolder.exists()){

           System.out.println("Directory does not exist.");
           //just exit
           System.exit(0);

        }else{

           try{
            copyFolder(srcFolder,destFolder);
           }catch(IOException e){
            e.printStackTrace();
            //error, just exit
                System.exit(0);
           }
        }

        System.out.println("Done");
    }

    public static void copyFolder(File src, File dest)
        throws IOException{

        if(src.isDirectory()){

            //if directory not exists, create it
            if(!dest.exists()){
               dest.mkdir();
               System.out.println("Directory copied from " 
                              + src + "  to " + dest);
            }

            //list all the directory contents
            String files[] = src.list();

            for (String file : files) {
               //construct the src and dest file structure
               File srcFile = new File(src, file);
               File destFile = new File(dest, file);
               //recursive copy
               copyFolder(srcFile,destFile);
            }

        }else{
            //if file, then copy it
            //Use bytes stream to support all file types
            InputStream in = new FileInputStream(src);
                OutputStream out = new FileOutputStream(dest); 

                byte[] buffer = new byte[1024];

                int length;
                //copy the file content in bytes 
                while ((length = in.read(buffer)) > 0){
                   out.write(buffer, 0, length);
                }

                in.close();
                out.close();
                System.out.println("File copied from " + src + " to " + dest);
        }
    }
}

      

        
        
        
      

    

Now I have used the above code to grab a copy of My Documents. But, unfortunately, he ended up with NullPointerException

after launching for a while.

The reason for the error is an attempt to take a copy of the "My Music" folder, which is not even in the "My Documents" folder. I tested this code on two different machines running Windows 7, got the same error on both.

A Windows specific solution is fine for me as I'm targeting Windows machines at the moment. What I did wrong?

The error I am getting is below

Directory copied from C:\Users\Yohan\Documents\My Music  to D:\Test\My Music
Exception in thread "main" java.lang.NullPointerException
        at CopyDirectoryExample.copyFolder(CopyDirectoryExample.java:51)
        at CopyDirectoryExample.copyFolder(CopyDirectoryExample.java:56)
        at CopyDirectoryExample.main(CopyDirectoryExample.java:25)