Editing Registry Fails

[PrinceSendai]

This is my program (Im using Windows 7)

public class Example{


	public static String command = "REG ADD HKLM\\... /v Name /t REG_DWORD /d Value";      //Replace ... with a valid path, Name with a valid key, and Value with a number


	public static void main(String[] args){
		try{


			Runtime.getRuntime().exec(command)
			
		}
		catch(Exception e){
			e.printStackTrace(System.err);
			
		}
		

	}



}

The problem I am having is that the registry key is not being edited, as it should.

I tried using a REG QUERY command and it works fine. My program is able to read the registry just fine. However, when I try to write to the registry (as above), my program runs without errors but when I check the registry, the registry key hasn't been edited at all.

I previously thought that it had something to do with Admin rights. However, I logged in as an Administrator and my program still didn't work correctly.

Also, I tested the "command" variable by typing it directly into the console, and the command works fine! In other words, I have no idea why Java is plugging in the correct command but the changes are being made.


Now, I have small suspicion. When I type in the command in the console, the console ASKS ME IF I WANT TO REPLACE THE EXISTING REGISTRY ENTRY, to which I respond with a "y".

Maybe this little step is causing the issue? Is my program prompting the user for a "y" in the background, without me noticing? If that is the case, how do I get access to this prompt, and more specifically, how do I make my program feed a "y" into this? This is all really abstract for me and I'm lost.

Please help!

[kjkrum]

Try the simplest solution first. Is there an option for the REG command that makes it non-interactive?

[Norm]

Perhaps there are error messages that you haven't coded for.
Get the Process returned from exec, get the Streams from that process and print them.

how do I make my program feed a "y" into this?

You can use a Stream to the Process to feed the program.

[PrinceSendai]

kjkrum

Try the simplest solution first. Is there an option for the REG command that makes it non-interactive?

I tried this and it worked! Had not thought about it, thanks!


Thanks guys

[DarrylBurke]

You got away with an easy fix this time, but you need to go through all the sections of When Runtime.exec() won't - JavaWorld

db

[PrinceSendai]

You got away with an easy fix this time, but you need to go through all the sections of When Runtime.exec() won't - JavaWorld

db

Thank you for the useful guide.