running simple cmd.exe commands with apache commons exec

Question

I want to run cmd.exe commands from java (for example md C:\\blabla to create a new directory C:\\blabla ) My code looks like this and it runs without any errors:

import java.io.IOException;
import org.apache.commons.exec.CommandLine;
import org.apache.commons.exec.DefaultExecutor;
import org.apache.commons.exec.ExecuteException;

public class Test {

    public static void main(String[] args) throws ExecuteException, IOException {
        CommandLine cmdLine = new CommandLine("cmd.exe");
        cmdLine.addArgument("md");
        cmdLine.addArgument("C:\\blabla");
        DefaultExecutor executor = new DefaultExecutor();
        executor.execute(cmdLine);
    }
}

But if I go to C:\\ there is no folder blabla as I would expect, since manually typing md C:\\blabla in cmd.exe works fine. I also tried "C:\\Windows\\System32\\cmd.exe" instead of "cmd.exe" but no use.

The output in the Console looks like this:

Microsoft Windows [Version 6.1.7601] Copyright (c) 2009 Microsoft Corporation. All rights reserved.

C:\\Users\\Selphiron\\workspace\\Test>

Where is the mistake?

Answer 1

The mistake is the command itself. Just try what you did in the command line.

Your code passes something like "cmd.exe md c:\\blabla" to the system. That starts a new shell. Just passing a shell command to cmd.exe doesnt do the trick. Try to use

cmd /c md c:\blabla

The /c makes all the difference here.