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Message:

spawning Win NT command prompt hangs

Posted by Srini on July 13, 2000 at 3:13 PM

Hi,

I tried to spawn an executable (e.g. sqlplus.exe) from
java and the program hangs in DOS prompt. I could see
"sqlplus.exe" in the windows task manager, but I dont know why
it doesnt "exit" after completing the task (sqlplus).

Note: If I run the same program from the "visual cafe", it works

Can any one help me?

Thanks in advance
Srini

> From the Sun developer help site, here is the workaround suggested for spawning Win NT command prompt:

> p = Runtime.getRuntime().exec("cmd.exe /c cmd.exe /c runtest.bat ");

> I tested and it worked. Good luck !
> Hien.

> > Hi,
> > I was trying to run a batch file from my program, so I did the following:
> > public static void main (String []args) {
> > /*
> > Threadtest t = new Threadtest();
> > t.start();*/
> > testrun();
> > }

> > public static void testrun () {
> > BufferedReader br = null;
> > BufferedReader br2 = null;
> > Process p = null;
> > int status = -1;
> > try {
> > String osName = System.getProperty("os.name");
> > if (osName.compareTo("Windows NT") == 0) {
> > //String []test = "cmd.exe", "/c", "runtest.bat");
> > p = Runtime.getRuntime().exec("cmd.exe /c runtest.bat ");
> > }
> > br = new BufferedReader(new InputStreamReader(p.getErrorStream()));
> > String s;
> > while ((s = br.readLine())!= null) {
> > System.out.println(s);
> > }
> > br2 = new BufferedReader(new InputStreamReader(p.getInputStream()));
> > while ((s = br2.readLine())!= null) {
> > System.out.println(s);
> > }
> > br.close();
> > br2.close();
> > }catch (IOException ioex) {ioex.printStackTrace();}
> > //return 0;
> > }
> > Now, this starts the dos prompt, and then the program waits on it.
> > It only continues after I kill the dos prompt. Is there any way that I can start the process and then forget about it?
> > I dont want to have any control after spawning off the process.
> > Could anyone help me with this problem?
> > Thanks
> > Sasipriya

• cmd hangs parag November 03, 2000 at 9:25 AM (0)