exec() function in java

[Lauren Ambrose]

Hello,
I want to run a perl script into my java application. For the moment I'm testing with runtime:: exec (). function which is available in java
Here is my code

       try
        {   
            Runtime rutm = Runtime.getRuntime();
            Process p = rutm.exec("cmd.exe");
            int val = p.exitValue();
            System.out.System.out.println("Process exitValue" + ExitVal);
        } catch (Throwable t)
          {
            t.printStackTrace();
          }

And even that does not work, I have this message. I get an error which running the program, if you have any idea about it , then please let me know. Thanks in advance.

[SoftWore]

Hello,
I ran your code and it works well with me yet. Are you sure to have access to "cmd.exe" from the directory where you run your application? tries to use this command from a console to check: it seems that Java does not simply find your program. I think you should try to run the program again using an IDE like eclipse and see if the program work, if not then try running with the terminal. Hope this will help you and I guess you got some idea from this.

[Miles Runner]

Hello,
Even I need to run the same command in my program, but it is not working. I did not have access to cmd.exe. Now I test with "ls" or even

Process p = r.exec (new String [] ( "perl", "", "scrt.pl"));

and I get the following error

java.lang.IllegalThreadStateException: 
Process Hasn't exited

Any help on this is appreciated, thanks in advance.

[Lauren Ambrose]

Hello,
It is clear, thank you, I really did anything. If not for my problem, it was enough to make a waitfor(), which seems a little strange because it seems to execute, in fact have one function and I made a small but good execution. Otherwise, I now also manages the flow. Thanks again for your help and if you know any alternate method for doing the same then I am the interested one here.

[InterNetWorKed]

Hello,
Have a look at the following code

   public class DoRuntime {
     public static void main(String args[]) throws IOException {

       if (args.length <= 0) {
         System.err.println("Need command to run");
         System.exit(-1);
       }

       Runtime rntm = Runtime.getRuntime();
       Process process = rntm.exec(args);
       InputStream inp = process.getInputStream();
       InputStreamReader inpstr = new InputStreamReader(inp);
       BufferedReader buff = new BufferedReader(inpstr);
       String line;

       System.out.printf("Output of running %s inp:", 
           Arrays.toString(args));

       while ((line = buff.readLine()) != null) {
         System.out.println(line);
       }

     }
    }

[NetWorkInG]

Hello,
Alternatively even this program can help you , take a look at it

import java.io.IOException; 
public class runexe{
    public static void main(String[] args){
    try
    {
    Process p = Runtime.getRuntime()
.exec("notepad.exe");
    }catch (IOException e)
    {
     e.printStackTrace();
    }
  }
}