ProcessBuilder does not work?

Question

I'm trying add a key register on windows using ProcessBuilder. Before I tried Runtime.getRuntime.exec() and doesn't work also.

I'm trying this.

ProcessBuilder p = new ProcessBuilder("reg add HKCU\\Software\\Microsoft\\Windows /v mykey /t REG_SZ /d " + "key_value");
 try {
 p.start();
 } catch (IOException ex) {
 Logger.getLogger(Registro.class.getName()).log(Level.SEVERE, null, ex);
 }

The exception is:

GRAVE: null
java.io.IOException: Cannot run program "reg add HKCU\Software\Microsoft\Windows /v mykey /t REG_SZ /d key_value": CreateProcess error=2, O sistema não pode encontrar o arquivo especificado
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:1042)
 at br.com.iguana.keys.Registro.addChavesRegistro(Registro.java:50)
 at br.com.iguana.keys.Registro.main(Registro.java:158)
Caused by: java.io.IOException: CreateProcess error=2, O sistema não pode encontrar o arquivo especificado
 at java.lang.ProcessImpl.create(Native Method)
 at java.lang.ProcessImpl.<init>(ProcessImpl.java:386)
 at java.lang.ProcessImpl.start(ProcessImpl.java:137)
 at java.lang.ProcessBuilder.start(ProcessBuilder.java:1023)
 ... 2 more

Any idea ?

• nanofarad: Is reg available as an executable on your path, as opposed to a shell builtin?
• FernandoPaiva: yep, In cmd I use reg and works. I tryied pass \\Windows\\System32 also and nothing
• nanofarad: Yes, but does reg.exe exist as an executable?
• FernandoPaiva: yep...look at: i.imgur.com/Mv9G3bO.png
• MadProgrammer: Separate you commands and parameters as individuals strings, this will reduce the possibility of errors...

Answer 1

reg is a cmd shell command not an executable as in it only exists inside the cmd.exe shell environment.

Answer 2

@Jarrod Roberson is right. You should use:

Process p = Runtime.getRuntime().exec("reg add HKCU\\Software\\Microsoft\\Windows /v mykey /t REG_SZ /d " + "key_value");

• FernandoPaiva: If I use: Runtime.getRuntime.exec() without Process does work, but create reg.exe on task monitor and doesn't close this task.
• Marcello Davi: I'm not sure, but call: p.destroy() should stop reg.exe
• FernandoPaiva: yep, I tried p.destroy(); and p.destroyForcibly(); but not stopped.
• Marcello Davi: Ok, now i remember. Without using p.destroy() or something similar you can use another cmd command. Always call Runtime.getRuntime().exec(command); and pass as parameter: taskkill /im reg.exe /f. The /f switch is called to force-kill the process in case it can't be killed normally.
• Marcello Davi: Just one more tip, the i'll leave you work :D Instead of create N Runtime to stop reg.exe, create a for loop