Thread: Can anyone help with my code please?? (Reading the Registry)

Hi, im trying to get this to read the registry by reading the contents of a folder, turning it in to an array then displaying the contents. When i compile it works fine with no errors, however when i run it once compiled, it give me the error

Exception in thread "main" java.lang.NullPointerException
at USBDevices.main(USBDevices.java:19)

I've tried putting throw IOException in to, which compiles fine but still gives me the same error message.

Can anyone help me with this?

Thanks

import java.io.*;
import java.util.*;
 
public class USBDevices
{
 
   public static void main(String[] args)
   {
 
   	// This retrieves the files from the registry and inserting it in to an array called file
 
      java.io.File listroot = new java.io.File("\"HKLM\\SYSTEM\\CurrentControlSet\\Enum\\USBSTOR\"");
      java.io.File[] files = listroot.listFiles();
 
      System.out.println("USB Registry Entries:");
 
     // This opens the array called and displays the results
 
      for (java.io.File file : files)
 
        {
         if (file.isDirectory())
            continue;
         System.out.println(file.getPath());
        }
 
 
 
    }
}

gives me the same error message.

What variable has a null value at line 19?
When you find the variable, you need to backtrack in the code to see why that variable does not have a valid value.

i dont get what i need to do. when i change the folder to read to a C:\\ folder it works fine but i just dont understand why it doesnt work for the registry folder.